CN116102302A - Polyurethane-cement composite grouting material for karst tunnel water burst mud with loess-rich solution cavity and water shutoff consolidation construction method thereof - Google Patents
Polyurethane-cement composite grouting material for karst tunnel water burst mud with loess-rich solution cavity and water shutoff consolidation construction method thereof Download PDFInfo
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- CN116102302A CN116102302A CN202211271332.4A CN202211271332A CN116102302A CN 116102302 A CN116102302 A CN 116102302A CN 202211271332 A CN202211271332 A CN 202211271332A CN 116102302 A CN116102302 A CN 116102302A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 239000004568 cement Substances 0.000 title claims abstract description 46
- 239000000463 material Substances 0.000 title claims abstract description 29
- 239000002131 composite material Substances 0.000 title claims abstract description 24
- 238000010276 construction Methods 0.000 title claims abstract description 19
- 238000007596 consolidation process Methods 0.000 title claims abstract description 16
- 230000009172 bursting Effects 0.000 claims abstract description 33
- 229920002635 polyurethane Polymers 0.000 claims abstract description 24
- 239000004814 polyurethane Substances 0.000 claims abstract description 24
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 15
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 11
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000035699 permeability Effects 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 44
- 238000012360 testing method Methods 0.000 claims description 24
- 230000000694 effects Effects 0.000 claims description 17
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000007689 inspection Methods 0.000 claims description 15
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 11
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 10
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 claims description 10
- 229920000570 polyether Polymers 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 9
- 230000001052 transient effect Effects 0.000 claims description 9
- 239000004359 castor oil Substances 0.000 claims description 8
- 235000019438 castor oil Nutrition 0.000 claims description 8
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 5
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 5
- CSKNSYBAZOQPLR-UHFFFAOYSA-N benzenesulfonyl chloride Chemical compound ClS(=O)(=O)C1=CC=CC=C1 CSKNSYBAZOQPLR-UHFFFAOYSA-N 0.000 claims description 5
- PASDCCFISLVPSO-UHFFFAOYSA-N benzoyl chloride Chemical compound ClC(=O)C1=CC=CC=C1 PASDCCFISLVPSO-UHFFFAOYSA-N 0.000 claims description 5
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 claims description 5
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 5
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 claims description 5
- 239000008096 xylene Substances 0.000 claims description 5
- 238000011156 evaluation Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 239000002689 soil Substances 0.000 claims description 2
- 230000032683 aging Effects 0.000 abstract description 2
- 201000010099 disease Diseases 0.000 abstract description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 2
- 230000008439 repair process Effects 0.000 abstract description 2
- 239000011440 grout Substances 0.000 description 6
- 235000011187 glycerol Nutrition 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 3
- 239000004970 Chain extender Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- 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
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Architecture (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a polyurethane-cement composite grouting material for karst tunnel water burst mud with a loess-rich solution cavity and a water shutoff consolidation construction method thereof. The polyurethane-cement composite grouting material comprises oily polyurethane, cement, sodium silicate, bauxite and metakaolin, and the raw materials are mixed with water for use. The material has the advantages of low permeability coefficient, high durability, excellent ageing resistance, mechanical property, environment friendliness and the like. The water shutoff consolidation construction method adopted by the invention can quickly repair the karst tunnel water bursting mud with the loess-enriched solution cavity, prevent the water bursting mud disease caused by the loess in the karst tunnel with the loess-enriched solution cavity in the period of abundant rainwater in summer, consolidate the loess and fill the solution cavity, ensure the karst tunnel with the loess-enriched solution cavity to safely and stably operate for a long time, and prolong the service life of the tunnel.
Description
Technical Field
The invention belongs to the technical field of karst tunnel water burst cement grouting materials with loess-rich solution cavities, and particularly relates to a polyurethane-cement composite grouting material for karst tunnel water burst cement with loess-rich solution cavities and a water shutoff consolidation construction method of the polyurethane-cement composite grouting material.
Background
With the continuous development of social economy, the construction level of the infrastructure in China is continuously improved, and tunnel construction gradually advances to the characteristics of large burial depth, high water pressure, long distance, large diameter and the like. The Shanxi province is located at the west of the Tai mountain, the yellow river is east, the mountain river is rich in the American names of the outside and the inside, the mountain river belongs to loess plateau areas in the northwest China, and the tunnel construction problem is extremely prominent. The problems of water burst, water burst and mud burst and the like caused by loess collapsibility, unknown water-containing body of a tunnel and the like are more serious, and how to effectively avoid and treat karst tunnel water burst and mud burst disasters with loess-rich solution cavities is an important scientific problem facing tunnel construction in Shanxi province.
The method combines the hydrogeology of the karst geology of the loess area to analyze the water burst in detail, and provides a design method for preventing and treating the water burst of the deep-buried high-pressure water-rich tunnel by means of engineering practice cases, thereby providing references and references for the implementation of similar engineering in the future and having great significance for the improvement of the water burst treatment technology of the tunnel.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the polyurethane-cement composite grouting material for karst tunnel water burst cement, which has the advantages of low permeability coefficient, high durability, excellent ageing resistance, excellent mechanical property, environment friendliness and the like, and the water blocking consolidation construction method of the polyurethane-cement composite grouting material.
The polyurethane-cement composite grouting material for karst tunnel water burst cement with the loess-rich solution cavity comprises, by mass, 5 parts of oily polyurethane, 30-40 parts of cement, 10-15 parts of sodium silicate, 15-25 parts of bauxite and 15-25 parts of metakaolin, wherein the raw materials are mixed with water, and the water addition amount is 0.8-1.2 times of the sum of the cement and the sodium silicate.
The oily polyurethane consists of 20 parts of castor oil based polyoxyethylene ether, 10 parts of polyether 204, 10 parts of polyether 303, 40 parts of Toluene Diisocyanate (TDI), 0.1 part of dibutyl tin dilaurate (catalyst), 0.3 part of stannous octoate (catalyst), 2 parts of 1, 6-hexanediol (chain extender), 1 part of glycerin (chain extender), 2 parts of xylene (diluent), 0.3 part of benzoyl chloride (retarder), 0.3 part of benzenesulfonyl chloride (retarder), 2 parts of n-heptane (foaming agent) and 2 parts of dibutyl phthalate (plasticizer) according to mass parts.
The preparation method of the polyurethane-cement composite grouting material for karst tunnel water burst cement with the loess-rich solution cavity comprises the following steps: mixing cement, sodium silicate, bauxite and metakaolin with water according to a certain proportion, stirring for 30-60 min to uniformly mix them, adding oily polyurethane, stirring for 15s, and grouting when the viscosity is 10-100 Pa.s, and pouring the prepared slurry within 60 min.
The water shutoff consolidation construction method comprises the following steps:
(1) Determining the thickness of a slurry stopping wall according to the water burst mud burst quantity, arranging the slurry stopping wall within the range of 100m-150m in front of a tunnel water burst mud burst bursting orifice, and adding sodium hydroxide solid to promote the consolidation of hydrous yellow soil;
(2) Dividing the water bursting mud level according to the water bursting mud quantity of the tunnel, comprehensively carrying out advanced geological forecast by adopting a geological survey method, a geological radar method, a transient electromagnetic method and an elastic wave emission method, detecting the water content and geological conditions in front of a tunnel face, adopting advanced greenhouse grouting combination radial grouting, adding polyurethane-cement composite grouting materials, and solidifying loess and broken surrounding rock in karst in front of the tunnel face or lining;
(3) Repairing 40cm-50cm drainage ditch or temporarily adopting welded pipe, introducing water to the position of transverse hole by means of multistage water pump, and discharging water out of the transverse hole so as to form water-burst mud-burst drainage channel;
(4) Using a big-arch shelter or a radial grouting method to distribute holes with quincuncial piles, wherein the aperture is 89mm-108mm, forming a tunnel water-bursting mud curtain in a grouting area after grouting, and reserving not less than 5m as a grouting rock disk for preventing secondary water-bursting mud disasters when the grouting depth is not less than 20m each time;
(5) And (3) performing grouting effect evaluation by using a core drilling sampling method and a pressurized water test, and detecting grouting effect by using a ground penetrating radar and transient electromagnetic.
The specific operation of the step (5) is as follows: in-situ measuring the permeability coefficient and the actual measured hammering number to test the grouting effect of the single-hole grouting test and the multi-hole grouting test; after grouting on the tunnel working face, drilling 3-5 inspection holes on the tunnel working face, taking a core to measure water leakage, and checking grouting water blocking effect; comprehensively judging grouting quality by using an inspection hole water pressing test in combination with an analysis method, an inspection hole method and a geophysical prospecting method; the water leakage amount of the core in the hard stratum drilling hole is less than 0.4L/min/m, and the water leakage amount of the core in the broken belt stratum is less than 0.2L/min/m.
The polyurethane-cement composite grouting material for karst tunnel water burst cement with the loess-rich solution cavity has the characteristics of light weight, high expansibility, early strength, water resistance, rapidness and the like. The karst tunnel water-bursting mud blocking and solidifying construction method comprises the steps of laying a grout stopping wall, measuring the tunnel water-bursting mud, advanced geological forecast, rapid grouting for preventing water-bursting mud solidification bodies, building a drainage channel, designing and treating grouting of a tunnel water-bursting mud curtain, evaluating and detecting grouting effects and the like. The karst tunnel water bursting mud water plugging consolidation construction method can quickly repair karst tunnel water bursting mud with rich loess in the dissolving cavity, prevent water bursting mud diseases caused by the loess in the karst tunnel with rich loess in the dissolving cavity in the period of abundant rainwater in summer, consolidate the loess, fill the dissolving cavity, ensure long-term safe and stable operation of the karst tunnel with rich loess in the dissolving cavity, and prolong the service life of the tunnel.
Drawings
FIG. 1 is a karst tunnel water burst mud photograph of a solution chamber rich in loess.
FIG. 2 is a photograph of a drainage channel for a karst tunnel water burst mud with a loess-rich solution cavity.
FIG. 3 is a process flow diagram of a water shutoff consolidation construction method of a polyurethane-cement composite grouting material for a karst tunnel water bursting cement with a loess-enriched solution cavity.
Fig. 4 is a photograph of the tunnel face grouting hole layout.
Detailed Description
Example 1:
(1) Preparing oily polyurethane: the castor oil based polyurethane emulsion is prepared by mixing 20 parts of castor oil based polyoxyethylene ether, 10 parts of polyether 204, 10 parts of polyether 303, 40 parts of toluene diisocyanate, 0.1 part of dibutyl tin dilaurate, 0.3 part of stannous octoate, 2 parts of 1, 6-hexanediol, 1 part of glycerin, 2 parts of xylene, 0.3 part of benzoyl chloride, 0.3 part of benzenesulfonyl chloride, 2 parts of n-heptane and 2 parts of dibutyl phthalate.
(2) Preparing polyurethane-cement composite grouting material for karst tunnel water burst mud with rich loess in dissolving cavity: the composition comprises, by mass, 5% of oily polyurethane, 40% of cement, 10% of sodium silicate, 25% of bauxite, and 20% of metakaolin. Mixing cement, sodium silicate, bauxite and metakaolin with water and stirring for 30min to uniformly mix, wherein the adding amount of water is 100% of the sum of the mass of the cement and the mass of the sodium silicate, adding oily polyurethane, stirring for 15s, and grouting is started when the viscosity of the oily polyurethane is 10Pa.s, and the prepared slurry is required to be completely filled within 60 min. The compressive strength of the grouting material core sample is 45MPa, and the permeability coefficient is 10 -8 cm/s, the core sample is complete and has no obvious damage.
(3) The karst tunnel water and mud bursting water plugging consolidation construction method comprises the following steps: determining the thickness of the grout stopping wall to be 5m according to the amount of the water burst mud burst, arranging the grout stopping wall 100m in front of a tunnel water burst mud burst bursting mouth to solidify the hydrous loess, and adding sodium hydroxide solid appropriately to promote the solidification of the hydrous loess; dividing the water bursting mud bursting grade according to the water bursting mud quantity of the tunnel, comprehensively carrying out advanced geological forecast by adopting a geological survey method, a geological radar method, a transient electromagnetic method and an elastic wave emission method, detecting the water content and the geological condition in front of a tunnel face, adopting advanced greenhouse grouting to combine radial grouting to prevent the water bursting mud, solidifying loess in karst in front of the tunnel face or lining as soon as possible, avoiding water bursting mud disasters, and adding polyurethane-cement composite grouting material to quickly solidify loess and broken surrounding rock in karst; repairing 40cm drainage ditch or temporarily adopting welded pipe, introducing water to the transverse hole position by multistage water pump, and discharging out of the hole to form water discharge channel for water and mud burst; and holes are distributed by using quincuncial piles and the aperture is 89mm by using a greenhouse or radial grouting method, as shown in fig. 4, a tunnel water-bursting mud curtain is formed in a grouting area after grouting, the grouting depth is 30m each time, and 5m is reserved as a grouting stopping rock disk so as to prevent secondary water-bursting mud disasters. And (3) checking and evaluating grouting effect: and the on-site measured permeability coefficient and the measured hammering number are used for checking grouting effects of the single-hole grouting test and the multi-hole grouting test. After grouting on the tunnel working face, 5 inspection holes are drilled on the tunneling face, a core is taken to measure water leakage, and grouting water blocking effect is inspected. The grouting quality test is mainly based on an inspection hole water pressure test and is comprehensively judged by combining an analysis method, an inspection hole method, a geophysical prospecting method and the like. The water leakage amount of the core in the hard stratum drilling is 0.1L/min/m, and the water leakage amount of the core in the broken belt stratum is 0L/min/m.
Example 2:
(1) Preparing oily polyurethane: the castor oil based polyurethane emulsion is prepared by mixing 20 parts of castor oil based polyoxyethylene ether, 10 parts of polyether 204, 10 parts of polyether 303, 40 parts of toluene diisocyanate, 0.1 part of dibutyl tin dilaurate, 0.3 part of stannous octoate, 2 parts of 1, 6-hexanediol, 1 part of glycerin, 2 parts of xylene, 0.3 part of benzoyl chloride, 0.3 part of benzenesulfonyl chloride, 2 parts of n-heptane and 2 parts of dibutyl phthalate.
(2) Preparing polyurethane-cement composite grouting material for karst tunnel water burst mud with rich loess in dissolving cavity: the polyurethane cement mortar comprises, by mass, 5% of oily polyurethane, 30% of cement, 15% of sodium silicate, 25% of bauxite and 25% of metakaolin. Mixing cement, sodium silicate, bauxite and metakaolin with water, stirring for 50min to obtain a uniform mixture, wherein the water is added in an amount of waterAnd adding oily polyurethane and stirring for 15s, and starting grouting when the viscosity of the polyurethane is 35Pa.s, wherein the prepared slurry is required to be completely poured within 60 min. The compressive strength of the grouting material core sample is 49MPa, and the permeability coefficient is 1.2 x 10 -8 cm/s, the core sample is complete and has no obvious damage.
(3) The karst tunnel water and mud bursting water plugging consolidation construction method comprises the following steps: the thickness of the grout stopping wall is determined to be 8m according to the amount of the water burst mud, the grout stopping wall is arranged 120m in front of a tunnel water burst mud bursting mouth so as to solidify the hydrous loess, and sodium hydroxide solid is properly added so as to promote the solidification of the hydrous loess; dividing the water bursting mud bursting grade according to the water bursting mud quantity of the tunnel, comprehensively carrying out advanced geological forecast by adopting a geological survey method, a geological radar method, a transient electromagnetic method and an elastic wave emission method, detecting the water content and the geological condition in front of a tunnel face, adopting advanced greenhouse grouting to combine radial grouting to prevent water bursting mud, solidifying loess in karst in front of the tunnel face or lining as soon as possible, avoiding water bursting mud disasters, and adding polyurethane-cement composite grouting materials to quickly solidify loess and broken surrounding rock in karst, thereby forming a quick grouting method; repairing a 50cm drainage ditch or temporarily adopting a welded pipe, leading water to the position of a transverse hole through a multi-stage water pump, and discharging the water out of the hole to form a drainage channel for water and mud burst; using a big-arch shelter or a radial grouting method to distribute holes with the quincuncial piles, wherein the hole diameter is 89mm, forming a tunnel water-bursting mud-bursting curtain in a grouting area after grouting, wherein each grouting depth is 30m, and reserving 8m as a grouting-stopping rock disk so as to prevent secondary water-bursting mud disasters; and (3) performing grouting effect evaluation by using a core drilling sampling method and a pressurized water test, and detecting grouting effect by using a ground penetrating radar and transient electromagnetic. And (3) checking and evaluating grouting effect: the grouting effect of the single-hole grouting test and the multi-hole grouting test should be checked by using the on-site measured permeability coefficient and the actual measured hammering number. After grouting on the tunnel working face, 5 inspection holes are drilled on the tunneling face, a core is taken to measure water leakage, and grouting water blocking effect is inspected. The grouting quality test is mainly based on an inspection hole water pressure test and is comprehensively judged by combining an analysis method, an inspection hole method, a geophysical prospecting method and the like. The water leakage amount of the core in the hard stratum drilling is 0.0L/min/m, and the water leakage amount of the core in the broken belt stratum is 0.1L/min/m.
Example 3:
(1) Preparing oily polyurethane: the castor oil based polyurethane emulsion is prepared by mixing 20 parts of castor oil based polyoxyethylene ether, 10 parts of polyether 204, 10 parts of polyether 303, 40 parts of toluene diisocyanate, 0.1 part of dibutyl tin dilaurate, 0.3 part of stannous octoate, 2 parts of 1, 6-hexanediol, 1 part of glycerin, 2 parts of xylene, 0.3 part of benzoyl chloride, 0.3 part of benzenesulfonyl chloride, 2 parts of n-heptane and 2 parts of dibutyl phthalate.
(2) Preparing polyurethane-cement composite grouting material for karst tunnel water burst mud with rich loess in dissolving cavity: the polyurethane cement mortar comprises, by mass, 5% of oily polyurethane, 40% of cement, 15% of sodium silicate, 15% of bauxite and 25% of metakaolin. Mixing cement, sodium silicate, bauxite and metakaolin with water and stirring for 40min to uniformly mix, wherein the adding amount of water is 100% of the sum of the mass of the cement and the mass of the sodium silicate, adding oily polyurethane, stirring for 15s, and grouting is started when the viscosity of the polyurethane is 100Pa.s, and the prepared slurry is required to be completely filled within 60 min. The compressive strength of the grouting material core sample is 56MPa, and the permeability coefficient is 2.6x10 -8 cm/s, the core sample is complete and has no obvious damage.
(3) The karst tunnel water and mud bursting water plugging consolidation construction method comprises the following steps: determining the thickness of the grout stopping wall to be 5m according to the amount of the water burst mud burst, arranging 150m in front of a tunnel water burst mud burst mouth to solidify the hydrous loess, and adding sodium hydroxide solid appropriately to promote the solidification of the hydrous loess; dividing the water bursting mud bursting grade according to the water bursting mud quantity of the tunnel, comprehensively carrying out advanced geological forecast by adopting a geological survey method, a geological radar method, a transient electromagnetic method and an elastic wave emission method, detecting the water content and the geological condition in front of a tunnel face, adopting advanced greenhouse grouting to combine radial grouting to prevent water bursting mud, solidifying loess in karst in front of the tunnel face or lining as soon as possible, avoiding water bursting mud disasters, and adding polyurethane-cement composite grouting materials to quickly solidify loess and broken surrounding rock in karst, thereby forming a quick grouting method; repairing a 50cm drainage ditch or temporarily adopting a welded pipe, leading water to the position of a transverse hole through a multi-stage water pump, and discharging the water out of the hole to form a drainage channel for water and mud burst; using a big-arch shelter or a radial grouting method to distribute holes with a quincuncial pile, wherein the hole diameter is 108mm, forming a tunnel water-bursting mud curtain in a grouting area after grouting, wherein each grouting depth is 25m, and reserving 5m as a grouting stopping rock so as to prevent secondary water-bursting mud disasters; and (3) performing grouting effect evaluation by using a core drilling sampling method and a pressurized water test, and detecting grouting effect by using a ground penetrating radar and transient electromagnetic. And (3) checking and evaluating grouting effect: the grouting effect of the single-hole grouting test and the multi-hole grouting test should be checked by using the on-site measured permeability coefficient and the actual measured hammering number. After grouting on the tunnel working face, drilling 3 inspection holes on the tunnel working face, taking a core to measure water leakage, and checking grouting water blocking effect. The grouting quality test is mainly based on an inspection hole water pressure test and is comprehensively judged by combining an analysis method, an inspection hole method, a geophysical prospecting method and the like. The water leakage amount of the core in the hard stratum drill hole is 0.0L/min/m, and the water leakage amount of the core in the broken belt stratum is 0.0L/min/m.
Claims (6)
1. The polyurethane-cement composite grouting material for karst tunnel water bursting mud with the loess-rich solution cavity is characterized by comprising the following raw materials of 5 parts by mass of oily polyurethane, 30-40 parts by mass of cement, 10-15 parts by mass of sodium silicate, 15-25 parts by mass of bauxite and 15-25 parts by mass of metakaolin, wherein the raw materials are mixed with water and then used.
2. The polyurethane-cement composite grouting material for karst tunnel water burst mud with loess-rich solution cavity as set forth in claim 1, wherein the water is added in an amount of 0.8-1.2 times the mass sum of cement and sodium silicate.
3. The polyurethane-cement composite grouting material for karst tunnel water burst mud with loess-rich solution cavity according to claim 1, wherein the oily polyurethane consists of 20 parts of castor oil based polyoxyethylene ether, 10 parts of polyether 204, 10 parts of polyether 303, 40 parts of toluene diisocyanate, 0.1 part of dibutyl tin dilaurate, 0.3 part of stannous octoate, 2 parts of 1, 6-hexanediol, 1 part of glycerol, 2 parts of xylene, 0.3 part of benzoyl chloride, 0.3 part of benzenesulfonyl chloride, 2 parts of n-heptane and 2 parts of dibutyl phthalate.
4. The preparation method of the polyurethane-cement composite grouting material for karst tunnel water burst mud with the loess-rich solution cavity according to claim 1, which is characterized by comprising the following specific operations: mixing cement, sodium silicate, bauxite and metakaolin with water according to a certain proportion, stirring for 30-60 min to uniformly mix them, adding oily polyurethane, stirring for 15s, and grouting when the viscosity is 10-100 Pa.s, and pouring the prepared slurry within 60 min.
5. The water shutoff consolidation construction method is characterized by comprising the following specific steps of:
(1) Determining the thickness of a slurry stopping wall according to the water burst mud burst quantity, arranging the slurry stopping wall within the range of 100m-150m in front of a tunnel water burst mud burst bursting orifice, and adding sodium hydroxide solid to promote the consolidation of hydrous yellow soil;
(2) Dividing the water bursting mud level according to the water bursting mud quantity of the tunnel, comprehensively carrying out advanced geological forecast by adopting a geological survey method, a geological radar method, a transient electromagnetic method and an elastic wave emission method, detecting the water content and geological conditions in front of a tunnel face, adopting advanced greenhouse grouting combination radial grouting, adding polyurethane-cement composite grouting materials, and solidifying loess and broken surrounding rock in karst in front of the tunnel face or lining;
(3) Repairing 40cm-50cm drainage ditch or temporarily adopting welded pipe, introducing water to the position of transverse hole by means of multistage water pump, and discharging water out of the transverse hole so as to form water-burst mud-burst drainage channel;
(4) Using a big-arch shelter or a radial grouting method to distribute holes with quincuncial piles, wherein the aperture is 89mm-108mm, forming a tunnel water-bursting mud curtain in a grouting area after grouting, and reserving not less than 5m as a grouting rock disk for preventing secondary water-bursting mud disasters when the grouting depth is not less than 20m each time;
(5) And (3) performing grouting effect evaluation by using a core drilling sampling method and a pressurized water test, and detecting grouting effect by using a ground penetrating radar and transient electromagnetic.
6. The water shutoff-consolidation construction method of claim 5, wherein the specific operation of the step (5) is as follows: in-situ measuring the permeability coefficient and the actual measured hammering number to test the grouting effect of the single-hole grouting test and the multi-hole grouting test; after grouting on the tunnel working face, drilling 3-5 inspection holes on the tunnel working face, taking a core to measure water leakage, and checking grouting water blocking effect; comprehensively judging grouting quality by using an inspection hole water pressing test in combination with an analysis method, an inspection hole method and a geophysical prospecting method; the water leakage amount of the core in the hard stratum drilling hole is less than 0.4L/min/m, and the water leakage amount of the core in the broken belt stratum is less than 0.2L/min/m.
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