CN111663948B - Water-rich sand-gravel stratum shield muck improvement additive and preparation method thereof - Google Patents
Water-rich sand-gravel stratum shield muck improvement additive and preparation method thereof Download PDFInfo
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- CN111663948B CN111663948B CN202010535401.2A CN202010535401A CN111663948B CN 111663948 B CN111663948 B CN 111663948B CN 202010535401 A CN202010535401 A CN 202010535401A CN 111663948 B CN111663948 B CN 111663948B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 239000000654 additive Substances 0.000 title claims abstract description 40
- 230000000996 additive effect Effects 0.000 title claims abstract description 40
- 230000006872 improvement Effects 0.000 title claims description 16
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 44
- 239000011707 mineral Substances 0.000 claims abstract description 44
- 239000002689 soil Substances 0.000 claims abstract description 42
- 239000003607 modifier Substances 0.000 claims abstract description 38
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 36
- 239000004094 surface-active agent Substances 0.000 claims abstract description 33
- 238000005086 pumping Methods 0.000 claims abstract description 25
- 235000010755 mineral Nutrition 0.000 claims description 43
- 229920002401 polyacrylamide Polymers 0.000 claims description 38
- 238000003756 stirring Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 20
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 18
- 125000000129 anionic group Chemical group 0.000 claims description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 17
- 229910000278 bentonite Inorganic materials 0.000 claims description 16
- 229940092782 bentonite Drugs 0.000 claims description 16
- 239000000440 bentonite Substances 0.000 claims description 16
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 12
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 12
- -1 cetyl hydroxyethyl Chemical group 0.000 claims description 11
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 10
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 10
- 239000002202 Polyethylene glycol Substances 0.000 claims description 10
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 10
- 229920001223 polyethylene glycol Polymers 0.000 claims description 10
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical group O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 7
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 7
- 229940080314 sodium bentonite Drugs 0.000 claims description 7
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 6
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 6
- 235000011152 sodium sulphate Nutrition 0.000 claims description 6
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical group O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 5
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 239000003945 anionic surfactant Substances 0.000 claims description 4
- 229920002678 cellulose Polymers 0.000 claims description 4
- 239000001913 cellulose Substances 0.000 claims description 4
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 229910000281 calcium bentonite Inorganic materials 0.000 claims description 2
- MYEGRIHQBUXGCK-UHFFFAOYSA-L disodium;sulfate;dodecahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-]S([O-])(=O)=O MYEGRIHQBUXGCK-UHFFFAOYSA-L 0.000 claims description 2
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 claims description 2
- 229920001451 polypropylene glycol Polymers 0.000 claims description 2
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 9
- 230000035699 permeability Effects 0.000 description 27
- 239000002893 slag Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 11
- 230000002209 hydrophobic effect Effects 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 8
- 235000017550 sodium carbonate Nutrition 0.000 description 8
- 229910000029 sodium carbonate Inorganic materials 0.000 description 8
- 238000009412 basement excavation Methods 0.000 description 6
- 239000000693 micelle Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 150000001768 cations Chemical class 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000010850 salt effect Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0678—Adding additives, e.g. chemical compositions, to the slurry or the cuttings
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention provides a water-rich sand-gravel stratum shield muck improving additive and a preparation method thereof, wherein the muck improving additive is a water-rich sand-gravel stratum shield muck improving additive which comprises or consists of the following components in percentage by mass: 0.1-1 wt% of tackifier A, 0.025-1 wt% of tackifier B, 0.025-0.5 wt% of surfactant, 1-10 wt% of pumping agent, 0.01-0.06 wt% of pH regulator, 5-15 wt% of mineral modifier and water. After the muck improving additive is used for improving the shield muck of the water-rich sand-gravel stratum, the occurrence of gushing during the construction of the earth pressure balance shield can be better avoided and reduced, the safe and smooth implementation of the construction is ensured, and the cut soil body is easy to convey.
Description
Technical Field
The invention relates to the technical field of construction, in particular to a water-rich sand-gravel stratum shield muck improving additive and a preparation method thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The earth pressure balance shield carries out tunnel excavation through earth pressure of the earth bin and water-earth pressure balance of an excavation surface, and the soil body cut by the cutter head needs to be adjusted to be a soil body with certain fluidity, low permeability and low cohesion, engineering and solidThe permeability coefficient is generally considered to be not more than 10 in the experiment-5The soil body with the magnitude of cm/s and the slump of 150-220mm meets the excavation condition.
In the process of improving the muck, a proper modifier is selected according to the specific stratum conditions, and the main modifiers comprise the following components: first, a mineral-based modifier. The bentonite and the montmorillonite are mainly used as main raw materials, are uniformly mixed by pulping equipment and are pumped into the excavated soil body, so that the fluidity and the impermeability of the soil body are ensured. Second, a water-soluble polymer modifier. The same is adopted by the high molecular compound material, and in the shield construction process, CMC and the like are generally used to increase the viscosity of the soil body of the excavation construction surface. Third, a modifier of the interfacial active material type. The muck modifier is widely applied in the shield construction process of China at present, and is used for directly injecting a foaming agent into an excavated soil body, so that the flow plasticity and the water impermeability of muck are improved, and the soil body can be prevented from generating an adhesion effect in the excavation process.
In the engineering, a foaming agent and bentonite are generally used singly or in a mixed manner to improve the stratum, however, the inventor finds that when a water-rich sandy gravel stratum with high water pressure and high permeability is encountered in the tunneling process, due to the characteristics of high content of sandy gravel, no cohesive force and the like, the soil body has poor conveying effect, difficult soil discharge and very easy occurrence of gushing accidents, and once large-scale gushing occurs, segment lining collapse and tunnel structure instability are easily caused, so that the safety of constructors is threatened, and the interval tunnel and construction equipment are directly scrapped, the loss is difficult to estimate; if the bentonite slurry is used for improvement, abundant underground water plays a role in dilution, the viscosity of the bentonite slurry is reduced, the bentonite slurry is easy to separate from slag soil, and the requirement cannot be met only by adding the foam and the bentonite.
Disclosure of Invention
Therefore, the invention aims to solve the problems of large soil permeability coefficient, easy gushing, no cohesive force, poor soil body flow plasticity, poor conveying effect, difficult soil discharge and the like of the water-rich sand-gravel stratum, and provides the muck modifier for the soil pressure balance shield of the water-rich sand-gravel stratum and the preparation method thereof.
Specifically, the technical scheme of the invention is as follows:
in a first aspect of the invention, the invention provides a shield muck improving additive for a water-rich sand-gravel stratum, which comprises or consists of the following components in percentage by mass: 0.1-1 wt% of tackifier A, 0.025-1 wt% of tackifier B, 0.025-0.5 wt% of surfactant, 1-10 wt% of pumping agent, 0.01-0.06 wt% of pH regulator, 5-15 wt% of mineral modifier and water (the total content of all the components is less than or equal to 100%).
In some embodiments of the invention, the shield muck improving additive for the water-rich sand-gravel formation consists of the following components in percentage by mass: 0.2-0.8 wt% of tackifier A, 0.04-0.8 wt% of tackifier B, 0.05-0.4 wt% of surfactant, 1-6 wt% of pumping agent, 0.02 wt% of pH regulator, 5-12 wt% of mineral modifier and the balance of water (the total content of all the components is 100%).
In some embodiments of the invention, the shield muck improving additive for the water-rich sand-gravel formation consists of the following components in percentage by mass: 0.2-0.8 wt% of tackifier A, 0.1-0.4 wt% of tackifier B, 0.05-0.4 wt% of surfactant, 4 wt% of pumping agent, 0.02 wt% of pH regulator, 8-12 wt% of mineral modifier and the balance of water (the total content of all the components is 100%).
In a more preferred embodiment of the invention, the shield muck improving additive for the water-rich sand-gravel formation consists of the following components in percentage by mass: 0.2 wt% of tackifier A, 0.1 wt% of tackifier B, 0.06 wt% of surfactant, 4 wt% of pumping agent, 0.02 wt% of pH regulator, 8 wt% of mineral modifier and the balance of water; or the shield muck improvement additive for the water-rich sand-gravel stratum consists of the following components in percentage by mass: 0.4 wt% of tackifier A, 0.2 wt% of tackifier B, 0.12 wt% of surfactant, 4 wt% of pumping agent, 0.02 wt% of pH regulator, 9 wt% of mineral modifier and the balance of water; or the shield muck improvement additive for the water-rich sand-gravel stratum consists of the following components in percentage by mass: 0.6 wt% of tackifier A, 0.3 wt% of tackifier B, 0.25 wt% of surfactant, 4 wt% of pumping agent, 0.02 wt% of pH regulator, 10 wt% of mineral modifier and the balance of water; or the shield muck improvement additive for the water-rich sand-gravel stratum consists of the following components in percentage by mass: 0.8 wt% of tackifier A, 0.4 wt% of tackifier B, 0.3 wt% of surfactant, 4 wt% of pumping agent, 0.02 wt% of pH regulator, 12 wt% of mineral modifier and the balance of water; the improved additive with the composition is used for improving the water-rich sand-egg stratum, and under the condition of the same injection rate, the improved stratum has better flowing plasticity and relatively lower permeability coefficient.
In the embodiment of the invention, the mineral modifier is added, so that the water retention and the flow plasticity of the soil body are increased, and the slag is easy to discharge. The mineral modifier is montmorillonite and/or bentonite, the effect is better when the mineral modifier is bentonite, and furthermore, the bentonite is sodium bentonite and/or calcium bentonite.
In an embodiment of the present invention, the tackifier a is selected from one or more of anionic polyacrylamide, cationic polyacrylamide and amphoteric polyacrylamide, preferably anionic polyacrylamide.
In an embodiment of the invention, the tackifier B is selected from hydrophobically modified cellulose, preferably cetyl hydroxyethylcellulose.
In an embodiment of the present invention, the surfactant is an anionic surfactant, and is selected from one or more of sodium lauryl polyoxyethylene ether sulfate and sodium sulfate dodecahydrate, preferably sodium lauryl polyoxyethylene ether sulfate.
In an embodiment of the present invention, the pH adjusting agent is soda ash.
In the embodiment of the invention, the pumping agent is added, so that the pumping performance of the muck modifier is improved, and the risk of pipe blockage is reduced. Wherein, the pumping agent is selected from one or more of polyethylene glycol, methoxy polyethylene glycol and polypropylene glycol, and the effect is better when the pumping agent is polyethylene glycol.
In the embodiment of the invention, the addition of the pH regulator improves the viscosity of the tackifier, and is helpful for further improving the impermeability of soil, and as a preferred embodiment, the pH regulator is a soda solution or a caustic soda solution; in the present invention, the pH is controlled to be 8 to 9, and the inventors have found in their studies that the effect of polyacrylamide is reduced or even lost when the polyacrylamide is dissolved at a pH of 10 or more in the composition of the present invention. Because the polar groups on the polyacrylamide molecular chains are separated by the alkaline substance, the electrostatic repulsion of partial polymer chain links is reduced, the curling degree is increased, and the viscosity is reduced. The viscosity, molecular chain and adsorption bridging effect of the polyacrylamide are influenced, when the alkaline substances are excessively increased, the polyacrylamide can also undergo chemical reaction with the polyacrylamide solution to generate a large amount of white flocs, the viscosity and application effect of the polyacrylamide are seriously influenced, and the realization of the technical effect of the polyacrylamide flocculant is not facilitated.
In the embodiment of the invention, the water retention property of the bentonite slurry can be further enhanced by adding an alkaline pH regulator, particularly soda ash, into the mineral modifier bentonite, particularly sodium bentonite; and other cations exist in the tackifier, particularly in an anionic polyacrylamide aqueous solution, negatively charged polyacrylamide molecules are coiled around the cations, so that the solution viscosity is reduced, generally speaking, under the condition of equivalent molecular weight, the viscosity is reduced along with the increase of the coiling degree, the stretched polyacrylamide molecules can easily network different soil particles together, so that the use work efficiency is increased, meanwhile, the sodium bentonite slurry is negatively charged under alkaline conditions, the cation adsorption is stronger, and can adsorb the cations in the solution, so that the polyacrylamide solution has higher viscosity. In an embodiment of the present invention, the polyacrylamide of the present invention is a high molecular weight polyacrylamide, and the molecular weight thereof is generally more than 700 ten thousand.
Further, in an embodiment of the invention, the tackifier to surfactant mass ratio of the invention is from 3.5:1 to 5: 1.
The tackifier A, the tackifier B and the surfactant are added into the additive formula, the surfactant is an anionic surfactant (the following surfactants refer to anionic surfactants), the viscosity of the solution is gradually increased along with the increase of the mass fraction of the surfactant to reach the maximum viscosity value (the proportion of the tackifier to the surfactant in the embodiment of the invention is in the range capable of increasing the viscosity, namely the mass ratio of the tackifier to the surfactant is 3.5:1-5:1), and then the viscosity of the solution starts to gradually decrease along with the continuous increase of the mass fraction of the surfactant. The reason is that the tackifier A and the tackifier B, particularly the tackifier B, have intramolecular and intermolecular association in the solution at the same time, each hydrophobic micro-region contains a plurality of hydrophobic chains with different numbers, when the concentration of the surfactant is lower, micelles formed by the surfactant accommodate a plurality of hydrophobic chains, so that the hydrophobic chains in the hydrophobic micro-regions of the polymer are continuously reduced, and the number of composite micelles in the solution is increased to form a more compact network structure, thereby increasing the viscosity of the solution. The mass fraction of the surfactant is increased again, the surfactant micelles capable of forming mixed micelles with the hydrophobic groups of the polymer are increased, namely the number of the hydrophobic chains of the polymer in the composite micelles is reduced, and the formed network structure is gradually destroyed, so that the apparent viscosity of the solution is reduced.
The improved additive formula for the shield muck of the water-rich sand-gravel stratum is prepared from a tackifier, a surfactant, a pumping agent, a pH regulator, a mineral modifier and water with specific contents and components, and the components have synergistic effects of improving the flow plasticity of the muck, remarkably increasing the cohesive force and impermeability of the water-rich sand-gravel stratum, avoiding and relieving gushing and facilitating slag discharge.
In a second aspect of the invention, the invention provides a method for preparing the additive for improving the shield muck of the water-rich sand-gravel stratum in the first aspect, which comprises the steps of adding the mineral modifier into water according to the mass ratio, stirring to dissolve the mineral modifier, adding the pH regulator to regulate the pH to 8-9, preferably 8, adding the tackifier A, B and the surfactant into the water according to the mass ratio, controlling the stirring speed to be 45-60 revolutions per minute, stirring to dissolve the tackifier A, B and the surfactant uniformly, adding the pumping agent, and stirring to dissolve and mix the tackifier fully.
In a third aspect of the invention, the invention also provides a method for improving shield muck of a water-rich sandy gravel formation, which comprises applying the additive for improving shield muck of the water-rich sandy gravel formation in the first aspect into the shield muck of the water-rich sandy gravel formation.
In an embodiment of the invention, the method for improving shield muck of the water-rich sandy egg stratum comprises the following steps: the water-rich sand-gravel stratum shield muck improving additive is injected into the water-rich sand-gravel stratum shield muck, the injection rate is 2-8 percent, and the volume percentage is high.
Compared with the prior art, the invention has the following beneficial effects:
the improved additive can obviously increase the cohesive force and impermeability of the water-rich sand-gravel stratum, avoid and reduce the occurrence of gushing during construction, ensure the safe and smooth implementation of construction, improve the water retention and the flow plasticity of muck, facilitate slag tapping and facilitate the transportation of cut soil; the improved slag soil has a slump value within the range of 150-220mm and a permeability coefficient not higher than 10-5cm/s magnitude, and has better fluidity and impermeability. And the pumping agent is added in the formula of the improved additive, so that the pumping performance is improved besides the functions, the risk of pipe blockage can be effectively reduced, and the improvement efficiency is improved. In addition, the improved additive of the invention has simple preparation method and is convenient for popularization and use.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The reagents or starting materials used in the present invention can be purchased from conventional sources, and unless otherwise specified, the reagents or starting materials used in the present invention can be used in a conventional manner in the art or in accordance with the product specifications. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred embodiments and materials described herein are intended to be exemplary only.
In an embodiment of the invention, the additive for improving the shield muck of the water-rich sand-gravel formation comprises or consists of the following components in percentage by mass: 0.1-1 wt% of tackifier A, 0.025-1 wt% of tackifier B, 0.025-0.5 wt% of surfactant, 1-10 wt% of pumping agent, 0.01-0.06 wt% of pH regulator, 5-15% of mineral modifier and water (the total content of all components is less than or equal to 100%); especially when the composition of the improved admixture is: 0.2-0.8 wt% of tackifier A, 0.04-0.8 wt% of tackifier B, 0.05-0.4 wt% of surfactant, 1-6 wt% of pumping agent, 0.02 wt% of pH regulator, 5-12 wt% of mineral modifier and the balance of water (the total content of all components is 100%), and the cement mortar has the excellent effects of improving the flow plasticity of the slag soil and increasing the cohesive force and impermeability of the water-rich sand-gravel stratum.
In the embodiment of the invention, the mineral modifier is montmorillonite and/or bentonite, especially sodium bentonite, and the combination of montmorillonite and/or bentonite, especially sodium bentonite, with a pH regulator (especially soda ash) and a tackifier polyacrylamide (such as cationic polyacrylamide, anionic polyacrylamide or amphoteric polyacrylamide, especially anionic polyacrylamide) can better network soil particles, enhance the water retention property, increase the viscosity, and improve the working efficiency and the improvement effect.
The present invention is shown below in specific examples for better illustrating the effects of the present invention. The mineral modifier described in the following examples and comparative examples is sodium bentonite, unless otherwise specified.
The experimental slag soil used in the embodiment and the comparative example mainly comprises sandstone and limestone, is round, has good roundness and grain size composition, and comprises the following components in percentage by weight: about 15% of 2-20 mm, about 30% of 20-60 mm, about 35% of more than 60 mm; the rest is filled with miscellaneous sand gravel and powder adhesive grains, and the water content is 20 percent.
The determination method and the judgment standard of the slump and the permeability coefficient in the embodiment and the comparative example of the invention are as follows: and (3) slump measurement: filling improved muck into a horn-shaped slump bucket with an upper opening of 100mm, a lower opening of 200mm and a height of 300mm for three times, uniformly impacting 25 times along the wall of the bucket from outside to inside by using a tamping hammer after each filling, tamping and leveling. And then the barrel is pulled up, the muck is collapsed due to self weight, and the height of the highest point of the muck after the slump is subtracted from the barrel height (300mm), namely the slump.
And (3) permeability coefficient determination: during the test, a saturated sample with the section of A and the length of L is filled in a transparent plastic cylinder, and a water valve is opened to enable water to flow through the sample from top to bottom and be discharged from a water outlet. And after the water head difference delta h and the seepage flow Q are stable, measuring the water quantity V flowing through the sample within a certain time t, and calculating according to Darcy's law k-QL/(A delta h) to obtain the permeability coefficient.
And (3) judging standard: the slump range is 150-220mm, the soil body obtained in the range can meet the excavation condition, the larger the numerical value is, the better the fluidity is, the permeability coefficient represents the water permeability, and the requirement is not more than 10-5The lower the value, the better the impermeability, in cm/s order.
Example 1
Adding a mineral modifier with the mass content of 8% into water, stirring to dissolve the mineral modifier, adding sodium carbonate to adjust the pH value to 8, mixing 0.2% of anionic polyacrylamide with the mass content, 0.1% of hexadecyl hydroxyethyl cellulose with the mass content and 0.06% of lauryl polyoxyethylene ether sodium sulfate with the mass content, adding the mixture into the water, controlling the stirring speed to be 45-60 revolutions per minute, stirring to dissolve the mixture uniformly, adding 4% of polyethylene glycol with the mass content, and stirring to dissolve and mix the mixture fully.
After the prepared admixture is injected into experimental slag soil (the injection rate is 5 percent by volume), the slump is 180mm, and the permeability coefficient is 6.25 multiplied by 10-6cm/s。
Example 2
Adding 9 mass percent of mineral modifying agent into water, stirring to dissolve the mineral modifying agent, adding sodium carbonate to adjust the pH value to 8, mixing 0.4 mass percent of anionic polyacrylamide, 0.2 mass percent of hexadecyl hydroxyethyl cellulose and 0.12 mass percent of lauryl polyoxyethylene ether sodium sulfate, adding the mixture into the water, controlling the stirring speed to be 45-60 revolutions per minute, stirring to dissolve the mineral modifying agent uniformly, adding 4 mass percent of polyethylene glycol, and stirring to dissolve and mix the mineral modifying agent fully.
After the prepared admixture is injected into experimental slag soil (the injection rate is 5 percent by volume), the slump is measured to be 203mm, and the permeability coefficient is 4.24 multiplied by 10-6cm/s。
Example 3
Adding 10% by mass of mineral modifier into water, stirring to dissolve the mineral modifier, adding sodium carbonate to adjust the pH value to 8, mixing 0.6% by mass of anionic polyacrylamide, 0.3% by mass of hexadecylhydroxyethyl cellulose and 0.25% by mass of lauryl polyoxyethylene ether sodium sulfate, adding the mixture into the water, controlling the stirring speed to be 45-60 revolutions per minute, stirring to dissolve the mineral modifier uniformly, adding 4% by mass of polyethylene glycol, and stirring to dissolve and mix the mineral modifier fully.
After the prepared admixture is injected into experimental slag soil (the injection rate is 5 percent by volume), the slump is measured to be 215mm, and the permeability coefficient is measured to be 2.74 multiplied by 10-6cm/s。
Example 4
Adding 12% by mass of mineral modifying agent into water, stirring to dissolve the mineral modifying agent, adding sodium carbonate to adjust the pH value to 8, mixing 0.8% by mass of anionic polyacrylamide, 0.4% by mass of hexadecylhydroxyethyl cellulose and 0.3% by mass of lauryl polyoxyethylene ether sodium sulfate, adding the mixture into the water, controlling the stirring speed to be 45-60 revolutions per minute, stirring to dissolve the mineral modifying agent uniformly, adding 4% by mass of polyethylene glycol, and stirring to dissolve and mix the mineral modifying agent fully.
After the prepared admixture is injected into experimental slag soil (the injection rate is 5 percent by volume), the slump is measured to be 206mm, and the permeability coefficient is 1.78 multiplied by 10-6cm/s。
Comparative example 1
An admixture for improving a soil was prepared in the same manner as in example 3 except that no anionic polyacrylamide was added at the time of preparation, and the amount of cetylhydroxyethylcellulose added was changed to 0.9% in order to keep the total mass fraction of the tackifier constant, as compared with example 3.
After the prepared admixture was poured into experimental soil (the pouring rate was 5% by volume), the slump was measured to be 182mm, and the permeability coefficient was 7.15X 10-6cm/s。
When the muck-improving additive is prepared, the side chains of the hexadecyl hydroxyethyl cellulose in the improver are mutually associated to form a net structure in a solution, the anionic polyacrylamide and the hexadecyl hydroxyethyl cellulose are mutually combined to enable the net structure of polymer molecules to be more compact, and the polymer molecules are injected and mixed with muck to realize the improvement of the fluidity and the permeability of the muck, and the lack of the anionic polyacrylamide enables the combination to be lost, so that the viscosity is reduced, and the slump is reduced and the permeability coefficient is increased.
Comparative example 2
A muck-improving admixture was prepared in accordance with the procedure of example 3, except that cetyl hydroxyethylcellulose was not added at the time of preparation, and the amount of anionic polyacrylamide added was changed to 0.9% in order to make the total mass fraction of the tackifier constant, as compared with example 3.
After the prepared admixture is injected into experimental slag soil (the injection rate is 5 percent by volume), the slump is 180mm, and the permeability coefficient is 1.12 multiplied by 10-5cm/s。
When the muck-improving additive is prepared, anionic polyacrylamide and hexadecyl hydroxyethyl cellulose in the improver are combined with each other to enable a polymer molecular net structure to be more compact, in addition, lauryl polyoxyethylene ether sodium sulfate and hexadecyl hydroxyethyl cellulose have stronger hydrophobic association, and are injected and mixed with muck to realize the improvement of fluidity and permeability of the muck, and the lack of hexadecyl hydroxyethyl cellulose enables the combination and the hydrophobic association to be lost, so that the viscosity is reduced, and the collapse degree is reduced and the permeability coefficient is increased.
Comparative example 3
The muck-improving admixture was prepared in accordance with the method of example 3, except that no mineral-based improver was added at the time of preparation, as compared with example 3.
After the prepared admixture is injected into experimental slag soil (the injection rate is 5 percent by volume), the slump is 173mm, and the permeability coefficient is 8.45 multiplied by 10-6cm/s。
Comparative example 4
A muck-improving admixture was prepared as in example 3, except that no pumping agent was added as compared to example 3.
After the prepared admixture was poured into experimental soil (5% pour rate), slump of 168mm and permeability coefficient of 3.88X 10 were measured-6cm/s。
Comparative example 5
A muck-improving admixture was prepared as in example 3, differing from example 3 only in that sodium carbonate was added to adjust the pH to 10.
After the prepared admixture is injected into experimental slag soil (the injection rate is 5 percent), the slump is measured to be 106mm, and the permeability coefficient is 4.52 multiplied by 10-5cm/s。
The tackifier A can be hydrolyzed under the condition of pH 10; meanwhile, the concentration of salt can be greatly increased, the molecular size of the polymer is reduced by the salt effect, the molecular chain is highly coiled, the inter-chain association is greatly broken, the space network structure is damaged, and the improvement effect is greatly reduced.
Comparative example 6
A soil improvement admixture was prepared in accordance with the method of example 3, differing from example 3 only in the addition amounts of anionic polyacrylamide, cetylhydroxyethylcellulose and sodium lauryl polyoxyethylene ether sulfate, which were 0.6 wt%, 0.3 wt% and 0.45 wt%, respectively.
After the prepared admixture was injected into experimental soil (injection rate: 5%), slump was measured to be 119mm, and permeability coefficient was measured to be 3.66X 10-5cm/s。
Comparative example 7
A soil improvement admixture was prepared in accordance with the method of example 3, differing from example 3 only in the addition amounts of anionic polyacrylamide, cetylhydroxyethylcellulose and sodium lauryl polyoxyethylene ether sulfate, which were 0.6 wt%, 0.3 wt% and 0.15 wt%, respectively.
After the prepared admixture is injected into experimental slag soil (the injection rate is 5 percent), the slump is 144mm, and the permeability coefficient is 1.67 multiplied by 10-5cm/s。
Comparative example 8
A soil improvement admixture was prepared in accordance with the procedure of example 3, differing from example 3 only in that sodium lauryl polyoxyethylene ether sulfate was not added.
After the prepared admixture is injected into experimental slag soil (the injection rate is 5 percent), the slump is measured to be 134mm, and the permeability coefficient is 2.58 multiplied by 10-5cm/s。
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. The additive for improving the shield muck of the water-rich sand-gravel stratum comprises the following components in percentage by mass: 0.1-1 wt% of tackifier A, 0.025-1 wt% of tackifier B, 0.025-0.5 wt% of surfactant, 1-10 wt% of pumping agent, 0.01-0.06 wt% of pH regulator, 5-15 wt% of mineral modifier and water;
the tackifier B is selected from hydrophobically modified cellulose;
the mass ratio of the tackifiers A and B to the surfactant is 3.5:1-5: 1;
the pumping agent is selected from one or more of polyethylene glycol, methoxy polyethylene glycol and polypropylene glycol;
the pH regulator is a soda solution or a caustic soda solution;
the mineral modifier is montmorillonite and/or bentonite.
2. The additive for improving the shield muck of the water-rich sand-gravel formation according to claim 1, which is characterized by comprising the following components in percentage by mass: 0.2-0.8 wt% of tackifier A, 0.04-0.8 wt% of tackifier B, 0.05-0.4 wt% of surfactant, 1-6 wt% of pumping agent, 0.02 wt% of pH regulator, 5-12 wt% of mineral modifier and the balance of water.
3. The additive for improving the shield muck of the water-rich sandy gravel stratum as claimed in claim 2, wherein the additive for improving the shield muck of the water-rich sandy gravel stratum consists of the following components in percentage by mass: 0.2-0.8 wt% of tackifier A, 0.1-0.4 wt% of tackifier B, 0.05-0.4 wt% of surfactant, 4 wt% of pumping agent, 0.02 wt% of pH regulator, 8-12 wt% of mineral modifier and the balance of water.
4. The additive for improving the shield muck of the water-rich sand-gravel formation as claimed in claim 1, wherein the mineral modifier is bentonite.
5. The water-rich sand egg stratum shield residue soil improvement additive agent as claimed in claim 4, wherein the bentonite is sodium bentonite and/or calcium bentonite.
6. The water-rich sand egg formation shield muck improving additive according to claim 1, wherein the tackifier A is selected from one or more of anionic polyacrylamide, cationic polyacrylamide and amphoteric polyacrylamide.
7. The additive for improving the shield muck of the water-rich sand-gravel formation as claimed in claim 6, wherein the tackifier A is anionic polyacrylamide.
8. The additive for improving the shield muck of the water-rich sandy gravel stratum as claimed in claim 1, wherein the tackifier B is cetyl hydroxyethyl cellulose.
9. The admixture for improving the shield muck of the water-rich sand egg formation, which is characterized in that the surfactant is an anionic surfactant and is selected from one or more of lauryl polyoxyethylene ether sodium sulfate and sodium sulfate dodecahydrate.
10. The additive for improving the shield muck of the water-rich sand egg formation, according to claim 9, is characterized in that the surfactant is sodium lauryl polyoxyethylene ether sulfate.
11. The additive for improving the shield muck of the water-rich sand-gravel formation of claim 1, wherein the pumping agent is polyethylene glycol.
12. The method for preparing the shield muck-improving additive for the water-rich sandy gravel formation of any one of claims 1 to 11, which comprises the following steps: adding the mineral modifying agent into water according to the mass ratio, stirring to dissolve the mineral modifying agent, adding a pH regulator to regulate the pH to 8-9, adding the tackifier A, B and the surfactant into the water, controlling the stirring speed at 45-60 revolutions per minute, stirring to dissolve the mineral modifying agent uniformly, adding the pumping agent, and stirring to dissolve and mix the mineral modifying agent fully.
13. A method for improving shield muck of a water-rich sandy ovoid formation, which comprises applying the shield muck-improving additive of any one of claims 1 to 11 to the shield muck of the water-rich sandy ovoid formation.
14. The method of claim 13, wherein the method comprises: the water-rich sand-gravel stratum shield muck improving additive is injected into the water-rich sand-gravel stratum shield muck, and the injection rate is 2-8% by volume percentage.
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| CN114456812A (en) * | 2022-01-07 | 2022-05-10 | 福州大学 | Method for preparing sandy soil muck modifier by using cohesive soil muck with granite residual soil, muck modifier and using method |
| CN114634817A (en) * | 2022-01-12 | 2022-06-17 | 北京市首发天人生态景观有限公司 | Soil conditioner, soil improvement method and application thereof |
| CN114716255A (en) * | 2022-03-17 | 2022-07-08 | 南京理工大学 | Ceramsite modifier fired by shield muck and method for sintering ceramsite by shield muck |
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