CN115536353A

CN115536353A - Preparation method of consolidated soil and bubble consolidated soil

Info

Publication number: CN115536353A
Application number: CN202211286081.7A
Authority: CN
Inventors: 谢先康; 冯懿; 秦为将; 徐迎丰; 刘开戈
Original assignee: Hunan Dasheng Environmental Protection Technology Co ltd
Current assignee: Hunan Dasheng Environmental Protection Technology Co ltd
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2022-12-30

Abstract

The invention discloses a method for preparing consolidated soil and bubble consolidated soil, which comprises preparing standard slurry by using residual soil, road waste soil and industrial solid wastes, classifying by impurity removal, crushing, screening, pulping and sand washing, adding a certain proportion of cementing material and additive, stirring to obtain high water-solid ratio pumpable consolidated soil slurryThe concrete has the characteristics of self-compaction, vibration-free, easy forming, easy construction and the like, and can be prepared into consolidation soil with the strength of 0.5-20 Mpa according to the change of the mixing proportion of the cementing materials. If the volume weight of the consolidation soil needs to be reduced, foam can be added into the consolidation soil slurry through a foaming machine to prepare the bubble consolidation soil, and the volume weight range of the bubble consolidation soil can be 6-16kN/m ³ In addition, the consolidation soil and the bubble consolidation soil can meet the requirements of most filling, backfilling or filling in engineering construction, and can replace part of low-grade concrete in the engineering construction.

Description

Preparation method of consolidated soil and bubble consolidated soil

Technical Field

The invention relates to the comprehensive utilization of solid wastes in the field of engineering construction, in particular to a method for preparing and forming consolidated soil and bubble consolidated soil by utilizing residual soil, road waste soil or industrial solid waste powdery waste residues.

Background

The residual sludge soil is construction waste such as waste soil, slag and materials of various construction projects in cities, along with the rapid development of a urbanization process, a large amount of residual sludge soil needing to be discarded is generated by underground excavation due to the construction of underground spaces and urban subways, the most traditional mode for treating the residual sludge soil in China at present is landfill, but the landfill mode not only occupies land resources but also causes pollution to the environment, and on the other hand, a large amount of residual sludge soil is stacked through a storage yard and has certain potential safety hazards. A large amount of spoil and spoil are generated in the road construction process, so that the problems of ecological environment damage, water and soil loss and geological disaster induction in a certain range along the road are caused, and the land resources also need to be occupied in the construction of spoil fields. The red mud, coal slag, manganese slag, phosphogypsum, desulfurized ash and a plurality of mine tailings in the bulk industrial waste are discharged, and the sludge and the waste incineration slag generated by environmental protection treatment occupy a large amount of land during stacking, so that the waste of manpower and material resources is caused, and the soil, water and atmosphere are polluted to cause the damage of ecological environment.

Meanwhile, urban construction and highway construction need to apply huge quantities of building materials such as cement, broken stones and gravel, the cement belongs to high-energy-consumption building materials, one ton of carbon dioxide needs to be discharged when one ton of cement is produced, the cement production limit is an important target, the exploitation of the broken stones and gravel causes great damage to the ecological environment, the ecological environment protection strength of the country is increased year by year, and the supply of the broken stones and gravel is more and more tense.

The invention utilizes the currently abandoned residual soil, road waste and powdery industrial solid wastes to prepare the consolidated soil and the bubble consolidated soil, can meet the application of most filling, backfilling or filling materials in engineering construction, replaces part of low-grade concrete in the field of engineering construction, and finally greatly reduces the requirements of cement, broken stones and gravels in the engineering construction.

Disclosure of Invention

The invention provides a preparation method of high-performance consolidated soil and bubble consolidated soil, aiming at solving the problems of the current residual sludge soil, waste soil and industrial solid waste disposal and the shortage of building materials.

In order to achieve the purpose, the preparation method of the consolidated soil provided by the invention comprises the following steps:

(1) Residual soil, road waste soil and powdery industrial solid waste are used as raw materials for preparing soil;

(2) Preparing standard slurry by adopting various processes of impurity removal, crushing, screening, pulping and sand washing according to the types of raw materials;

(3) Adding a certain proportion of cementing materials into the slurry, and stirring to prepare high-water-solid-ratio pumpable consolidated soil slurry;

(4) And pumping the consolidated soil slurry to a construction site through a pumping machine to complete the concreting of the consolidated soil.

Preferably, the step (2) includes:

feeding the prepared soil into a crushing and screening integrated machine for crushing and screening, and screening out the prepared soil with the particle size less than 5mm;

putting prepared soil with the particle size of less than 5mm into a double-shaft horizontal stirrer according to a water-solid ratio determined by a production mixing ratio, stirring to prepare slurry for the first time, and passing through a rotary vibrating screen, wherein the aperture of the rotary vibrating screen is 3-5mm;

and conveying the prepared first-time slurry to a vibration sand washer, passing through a double-layer vibrating screen to obtain standard slurry, and storing the standard slurry to a slurry finished product tank, wherein the aperture of a first layer of the double-layer vibrating screen is 1-2mm, and the aperture of a second layer of the double-layer vibrating screen is within 1 mm.

Preferably, the second layer of the double layer vibrating screen has a pore size of 0.25mm.

Preferably, when the water content exceeds 30%, the step of feeding the prepared soil into a crushing and screening all-in-one machine for crushing and screening to obtain the prepared soil with the particle size of less than 5mm is omitted.

Preferably, the production mix ratio is: 60-80 parts of prepared soil, 20-40 parts of cementing materials, 0-1 part of additives and 50-70 parts of water, wherein the production mixing ratio is a mass ratio; the weight ratio of the water to the (cementing material + prepared soil) is (5-7): 10.

preferably, the cementing material is at least one of cement clinker, fly ash, steel slag powder, water slag powder, phosphogypsum, fluorgypsum, desulfurized gypsum, slag powder or lime.

In order to achieve the purpose, the preparation method of the bubble consolidated soil provided by the invention comprises the following steps:

(4) And conveying the concreted soil slurry to intelligent foaming equipment, adding a foaming agent, stirring, and pumping to a construction site to complete the pouring of the bubble concreted soil.

The invention has the beneficial effects that:

1. the invention mainly applies a novel gelling consolidation technology to the powdery muddy waste residue in the engineering waste soil or industrial solid waste to prepare high-performance consolidated soil and bubble consolidated soil, can increase the economic benefits of engineering main bodies and construction enterprises in the application engineering construction with high added value by improving the usability of the waste soil or solid waste, improves the enthusiasm of using the waste soil or solid waste, and effectively reduces the discharge of the waste soil and the solid waste, thereby reducing the occupation of land resources and realizing the protection of ecological environment.

2. The high-performance concretion soil and the bubble concretion soil have two points of concretion different from other forms of soil, on one hand, the application scene is richer, the high-performance concretion soil and the bubble concretion soil can be applied to projects such as roadbed filling, protection, pavement, bridge and the like, on the other hand, according to the method and the flow, the soil can be prepared into concrete as fine aggregate, the standardized design construction flow of waste soil utilization can be formed, the material formula and the design construction technical standard of the concretion soil and the bubble concretion soil are established, and conditions are created for large-area popularization and utilization of waste soil to prepare engineering building materials.

3. The invention provides a novel material for the field of engineering construction, fills the gap of building materials between filling soil and cement concrete, the strength range of consolidated soil and bubble consolidated soil is 0.5Mpa-20Mpa, the volume weight range can be 6-16kN/m ³ The method not only belongs to the hydraulic material which has the characteristics of high concrete strength, good plasticity, high durability and the like, but also can use local materials and utilize various soils as aggregates, thereby greatly reducing the use cost of the material, and meanwhile, according to the preparation method and the flow of the invention, the standard design construction acceptance management system can be widely popularized and applied.

4. The cementing material disclosed by the invention adopts a large amount of industrial byproducts such as coal ash, slag powder, steel slag powder and desulfurized gypsum, and a composite cementing system formed by adding the components utilizes the microscopic filling effect of fine admixtures, so that the composite system is more compact, the defect of weak capability of cementing soil particles is thoroughly solved, the cement dosage is reduced, the carbon emission is reduced, the ecological environment is protected, and the application cost of engineering can be reduced by adopting solid waste resources as raw materials.

5. According to the consolidation soil and the bubble consolidation soil, the adopted cementing material is a high water system, the particles are fine and uniform, the fluidity is good during construction, the pumping is convenient, the strength requirement can be met through self-compaction without vibration, and the construction efficiency is very high.

6. The bubble consolidation soil prepared by the invention is a light solid material containing a large number of uniformly closed micro pores, and the volume weight range can be 6-16kN/m ³ The material can solve the filling backfill of a plurality of special construction points in the engineering construction, and the aim of reducing the structure load is fulfilled by utilizing the characteristics of light material and small load of the bubble consolidation soil in the engineeringThe method reduces post-construction settlement and uneven settlement, reduces disturbance to other structural layers of the engineering, can be applied to engineering projects such as roadbed widening, steep slope roadbed filling, bridge span reduction optimization, bridge abutment backfill, soft soil roadbed and the like, and is also suitable for backfill or filling of a fertilizer trough, a pipe culvert, a pipe gallery, a subway, an underground cavity, goaf treatment and the like.

7. The invention innovatively provides secondary pulping, firstly, standard-density slurry is prepared independently, then the slurry is used for replacing water and soil materials, and then the slurry is stirred with a cementing material to form finished product slurry, so that the problems of nonuniform stirring of the soil and the cementing material, long stirring time and high cost in the prior art are thoroughly solved.

In a word, the high-performance concreted soil and the bubble concreted soil provided by the invention are characterized in that soil is taken as a raw material, a certain proportion of cementing materials and additives are added, the materials can be stirred on site to form a pumpable material, the integral rigidity and the strength can be adjusted, the performance is stable, the environment is protected, the on-site construction is adopted, the on-site digging and using can be realized, mechanical equipment is miniaturized, moved, adjusted and transported conveniently, the bubble concreted soil enriches application scenes, and the application of special scenes in engineering construction can be solved by utilizing the characteristics of light weight, high strength and convenient construction.

Detailed Description

The invention provides a preparation method of consolidated soil, which comprises the following steps:

sieving gravel

Removing sundries such as turf, household garbage, tree roots and the like from soil in a soil taking field to obtain prepared soil, then feeding the prepared soil into a crushing and screening integrated machine to crush cohesive soil masses, screening the cohesive soil masses through a 5mm screen, and screening out prepared soil with the particle size of less than 5mm.

(II) stirring to prepare slurry

And putting the prepared soil with the particle size of less than 5mm into a double-shaft horizontal stirrer according to the water-solid ratio determined by the production mix proportion design for stirring to prepare the first slurry, and removing impurities such as grass root broken stones, pebbles and the like by adopting a rotary vibrating screen (with the aperture of 3-5 mm) before the slurry enters the next procedure.

(III) washing sand

And (3) conveying the primarily prepared slurry to a vibration sand washer to pass through a double-layer vibration sieve (the diameter of the first layer is 1-2mm, and the diameter of the second layer is less than 1 mm) to obtain standard slurry.

(IV) storage

And storing the standard slurry into a slurry finished product tank, wherein the slurry finished product tank is kept in a continuous flowing state when the standard slurry is stored.

(V) adding curing agent for pulping

And extracting standard slurry according to the mixing amount of each material determined by the production mixing proportion, conveying the slurry to a vertical shaft planetary stirrer, adding other admixtures, stirring to finish secondary pulping, and pumping the secondarily prepared consolidated soil slurry to a construction site through a pumping machine to finish pouring.

And (5) if the foamed consolidated soil needs to be prepared, conveying the consolidated soil slurry obtained in the step (five) to intelligent foaming equipment, determining the mixing amount according to the production mixing ratio, adding a foaming agent, stirring, and pumping to a construction site to finish the pouring of the foamed consolidated soil.

Wherein, the prepared soil is divided into materials with the water content of less than or equal to 30 percent and materials with the water content of more than 30 percent, if the water content is more than 30 percent, the step of crushing and screening can be omitted, and the step of preparing the slurry by stirring can be directly carried out. The material with the water content of less than or equal to 30 percent is usually crushed rock soil, pebble soil, soft rock, muck containing brick cement blocks, manganese slag and the like. The materials with the water content higher than 30 percent are usually silt, silt soil, high liquid limit clay, red mud, tailings, sludge and the like.

Further, the production mix proportion is designed through the following steps:

1. raw material inspection:

(1) carrying out a particle analysis test on the prepared soil, and measuring the particle size component composition of coarse sand (the diameter is 2.0-0.2 mm), fine sand (0.2-0.02 mm), powder particles (0.02-0.002 mm) and clay particles (below 0.002 mm);

(2) the density of the raw materials (soil, all components of the cementitious material) was measured.

2. Designing a target mixing ratio:

and (4) deducing the using amount of the cementing material (the higher the content of the clay particles is, the smaller the using amount of the cementing material is) according to the analysis test result of the prepared soil particles, and calculating the mass of each cementing material, the soil mass and the water mass by a volume method. And obtaining a target mix proportion meeting the design requirement through an orthogonal experiment. The formula involved is as follows:

in the formula:

m _{soil for soil} : calculating the soil dosage of the consolidation soil per cubic meter of the mix proportion;

m _{water (W)} : calculating the water consumption of the consolidation soil per cubic meter of the mix proportion;

m _{n. glue 1} : calculating the using amount of the cementing material of the consolidation soil per cubic meter of the mixing ratio, wherein the glue 1.. N represents each component of the cementing material;

ρ _{soil for soil} : density of soil (kg/m) ³ ) The method can be measured according to the current industry standard JTG 3430-2020 Standard test for road engineering;

ρ _{water (W)} : density of water (kg/m) ³ ) It is desirable to take 1000kg/m ³ ；

ρ _{N. glue 1} : density of cementitious Material (kg/m) ³ ) The density is the density of the components of the cement.

3. Designing the production mixing ratio: and determining the mixing amount of various materials according to the target mixing ratio to perform trial production. And (3) carrying out 7d strength test on the mixing amount designed by the target mixing ratio and the mixing amount of +/-5% of the mixing amount, comprehensively determining the optimal using amount of the production mixing ratio through indoor test and field test, wherein the difference between the determined optimal using amount and the result designed by the target mixing ratio is not more than +/-2%.

4. Determining construction parameters: the standard mud density should also be calculated when field testing is performed. In the later practical production process, sampling detection needs to be carried out on the density of the standard slurry in the slurry finished product tank, and if the difference between the density and the numerical value calculated in the field test is more than +/-5%, the standard slurry in the slurry finished product tank needs to be re-prepared.

The method for density testing of soil is described in detail below:

placing the prepared soil in a porcelain bowl, drying in an oven at 105 ℃ to constant weight, placing in a dryer for cooling, and accurately weighing (m 1) together with a small ox horn spoon and a funnel. And (3) injecting distilled water into the pycnometer to the scale of 0-1mL, placing the pycnometer into a constant-temperature water tank at 20 ℃, and standing until the water temperature in the pycnometer is not changed. The water level scale (V1) in the pycnometer is read. Adding a ox horn spoon soil sample into the specific gravity bottle through a funnel, and slightly shaking the specific gravity bottle until the liquid level of water in the specific gravity bottle rises to be close to the maximum reading of the specific gravity bottle to enable air in the bottle to escape sufficiently. The pycnometer is put into the constant-temperature water tank again, and when the temperature does not change any more, the reading (V2) of the pycnometer is read. Accurately weighing the mass (m 2) of the ox horn spoon, the porcelain bowl, the funnel and the residual soil sample, and calculating the density rho f = (m 1-m 2)/(V2-V1) of the soil according to the following formula.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail with reference to the following embodiments.

In the embodiment, the mineral powder used is S95-grade mineral powder, the cement is ordinary portland cement P.O 42.5, the desulfurized gypsum is desulfurized gypsum (the main component of which is calcium sulfate dihydrate CaSO4.2H2O) desulfurized by a dry method in a certain power plant, and the fly ash is II-grade fly ash. The foaming agent is a macromolecular composite foaming agent KH-80.

Example 1

The soil is common loess with a density of 1.87g/cm ³ The natural water content is 8.3%. The liquid limit is 32.1 percent and the plastic limit is 18.5 percent.

The mass ratio of water to solid materials (including curing agent and raw material soil) is as follows: 0.6:1.

The mass ratio of the curing agent to the raw material soil is as follows: 1:1.

The curing agent comprises the following components: 30 parts of P.O 42.5 cement, 40 parts of S95 mineral powder, 20 parts of fly ash and 10 parts of desulfurized gypsum.

The preparation process comprises the following steps:

s1: screening raw soil to remove impurities, and crushing the raw soil into qualified soil with the particle size of less than or equal to 5mm;

s2: preparation of a curing agent: 30 parts of P & O42.5 cement, 40 parts of S95 mineral powder, 20 parts of fly ash and 10 parts of desulfurized gypsum are mixed to prepare a curing agent for later use;

s3: the raw material soil and water are stirred, mixed and stirred for 3min to form first slurry, the first slurry is filtered through a rotary vibrating screen with the aperture of 3mm, then the first slurry is conveyed to a vibrating sand washer and filtered through a double-layer vibrating screen (the aperture of a first layer is 1mm, the aperture of a second layer is 0.25 mm) to prepare second slurry, and then a curing agent is added to stir and mix for 3min to obtain consolidated soil slurry. And then 0.25 weight part of KH-80 foaming agent is diluted by 20 times with water to obtain foam, the prepared foam liquid is injected into a foaming device, and the foam is immediately added into the consolidated soil slurry to be continuously stirred and mixed for 3min after the foam is obtained, so that wet bubble consolidated soil slurry is obtained. And (4) respectively sampling the consolidated soil and the bubble consolidated soil obtained by pouring the slurry to test the wet volume weight and the slump expansion degree.

S4: by using

Measuring slump expansion degree recording data by the cylindrical drum, judging that the slump expansion degree is greater than or equal to 90mm as qualified, and curing by a standard curing system: the unconfined compressive strength of the cured products of 7 days and 28 days is detected, and the detection data are recorded as shown in Table 1.

Example 2

The mass ratio of water to solid materials (including the curing agent and the raw material soil) is as follows: 0.6:1.

The mass ratio of the curing agent to the raw material soil is as follows: 3:7.

The curing agent comprises the following components: 10 parts of P.O 42.5 cement, 15 parts of S95 mineral powder and 5 parts of desulfurized gypsum.

The preparation process comprises the following steps:

s2: preparation of a curing agent: 10 parts of P & O42.5 cement, 15 parts of S95 mineral powder and 5 parts of desulfurized gypsum are mixed to prepare a curing agent for later use;

s3: the raw material soil and water are stirred, mixed and stirred for 3min to form first slurry, the first slurry is filtered by a rotary vibrating screen with the aperture of 3mm, then the first slurry is conveyed to a vibrating sand washer and is filtered by a double-layer vibrating screen (the aperture of the first layer is 1mm, the aperture of the second layer is 0.25 mm) to prepare second slurry, and then a curing agent is added to be stirred and mixed for 3min to obtain consolidated soil slurry. And (4) sampling the consolidated soil obtained by pouring the slurry to test the wet volume weight and the slump expansion degree.

S4: by using

Example 3

The soil is silt with the density of 1.97g/cm ³ The natural water content is 102%. The liquid limit is 44.5 percent and the plastic limit is 20.6 percent.

The mass ratio of the curing agent to the raw material soil is as follows: 1:1.

The preparation process comprises the following steps:

s1: preparation of a curing agent: 30 parts of P & O42.5 cement, 40 parts of S95 mineral powder, 20 parts of fly ash and 10 parts of desulfurized gypsum are mixed to prepare a curing agent for later use;

s2: the raw material soil and water are stirred, mixed and stirred for 3min to form first slurry, the first slurry is filtered through a rotary vibrating screen with the aperture of 3mm, then the first slurry is conveyed to a vibrating sand washer and filtered through a double-layer vibrating screen (the aperture of a first layer is 1mm, the aperture of a second layer is 0.25 mm) to prepare second slurry, and then a curing agent is added to stir and mix for 3min to obtain consolidated soil slurry. And then 0.25 weight part of KH-80 foaming agent is diluted by 20 times with water to obtain foam, the prepared foam liquid is injected into a foaming device, and the foam is immediately added into the consolidated soil slurry to be continuously stirred and mixed for 3min after the foam is obtained, so that wet bubble consolidated soil slurry is obtained. And (4) respectively sampling the consolidated soil and the bubble consolidated soil obtained by pouring the slurry to test the wet volume weight and the slump expansion degree.

S3: by using

And (3) measuring slump expansion of the cylindrical barrel, recording data, determining that the slump expansion is greater than or equal to 90mm as qualified, and curing according to a standard curing system: after 7 days and 28 days of maintenance age, the unconfined compressive strength is detected, and the detection data are recorded as shown in Table 1.

Example 4

The mass ratio of the curing agent to the raw material soil is as follows: 3:7.

The curing agent comprises the following components: 10 parts of P & O42.5 cement, 15 parts of S95 mineral powder and 5 parts of desulfurized gypsum.

The preparation process comprises the following steps:

s1: preparation of a curing agent: 10 parts of P & O42.5 cement, 15 parts of S95 mineral powder and 5 parts of desulfurized gypsum are mixed to prepare a curing agent for later use;

s2: the raw material soil and water are stirred, mixed and stirred for 3min to form first slurry, the first slurry is filtered through a rotary vibrating screen with the aperture of 3mm, then the first slurry is conveyed to a vibrating sand washer and filtered through a double-layer vibrating screen (the aperture of a first layer is 1mm, the aperture of a second layer is 0.25 mm) to prepare second slurry, and then a curing agent is added to stir and mix for 3min to obtain consolidated soil slurry. And (4) sampling the consolidated soil obtained by pouring the slurry to test the wet volume weight and the slump expansion degree.

S3: by using

Slump expansion recorded data are measured by the cylindrical barrel, and the slump expansion is more than or equal to 90mm is regarded as qualified, and the curing system is standard curing: after 7 days and 28 days of maintenance age, the unconfined compressive strength is detected, and the detection data are recorded as shown in Table 1.

Example 5

The raw material is construction solid waste.

The mass ratio of the curing agent to the building solid waste of the raw materials is as follows: 1:1.

The curing agent comprises the following components: 22 parts of P.O 42.5 cement, 22 parts of S95 mineral powder and 6 parts of desulfurized gypsum.

The preparation process comprises the following steps:

s1: screening the solid waste of the building to remove impurities, and crushing the solid waste into qualified soil with the particle size of less than or equal to 5mm;

s2: preparation of a curing agent: 22 parts of P.O 42.5 cement, 22 parts of S95 mineral powder and 6 parts of desulfurized gypsum are mixed to prepare a curing agent for later use;

s3: the method comprises the steps of stirring, mixing and stirring the building solid waste and water for 3min to form first slurry, enabling the first slurry to pass through a rotary vibrating screen with the aperture of 4mm, conveying the first slurry to a vibrating sand washer to pass through a double-layer vibrating screen (the aperture of a first layer is 2mm, and the aperture of a second layer is 0.25 mm) to obtain second slurry, and adding a curing agent to stir and mix for 3min to obtain consolidated soil slurry. And then 0.25 weight part of KH-80 foaming agent is diluted by 20 times with water to obtain foam, the prepared foam liquid is injected into a foaming device, and the foam is immediately added into the consolidated soil slurry to be continuously stirred and mixed for 3min after the foam is obtained, so that wet bubble consolidated soil slurry is obtained. And (4) respectively sampling the consolidated soil and the bubble consolidated soil obtained by pouring the slurry to test the wet volume weight and the slump expansion degree.

S4: by using

TABLE 1 statistical table of performance parameters of consolidation soil and bubble consolidation soil

From examples 1 to 5, it can be found that the strength required by the engineering can be prepared by adjusting the mixing amount of the curing agent, the water-solid ratio and the like, and the strength can be 0.5 to 1.5MPa, 3.0 to 7.0MPa and 10 to 20MPa for the protection engineering. The strength of the bubble consolidation soil is 0.5-1.2 Mpa according to the needs of roadbed filling, and the density can be controlled to be 6-16KN/m by adjusting the bubble rate in the bubble consolidation soil ³ In the range of 6-10KN/m for roads ³ 。

Example 6

The implementation process is the same as that of example 1, except that the first slurry is respectively filtered through different double-layer vibrating screens, wherein the aperture of the first layer of each double-layer vibrating screen is 1mm, and the aperture of the second layer of each double-layer vibrating screen is 0.25mm, 0.1mm and 0.5 mm), and the other operations are the same. By using

Measuring slump expansion degree recording data by the cylindrical drum, judging that the slump expansion degree is greater than or equal to 90mm as qualified, and curing by a standard curing system: the unconfined compressive strength of the cured products of 7 days and 28 days is detected, and the detection data are recorded as shown in Table 2.

TABLE 2 statistical table of performance parameters of consolidated soil after passing through different screens

The data show that the strength of the consolidated soil prepared by mud through different screens is greatly different, so that the grain size is an important factor influencing the strength of the consolidated soil and also an important factor restricting the standardized preparation of the consolidated soil by various soils.

Claims

1. A method for preparing consolidated soil, comprising the steps of:

2. The method of claim 1, wherein step (2) comprises:

3. The method of claim 2, wherein the second layer of the double layer vibrating screen has a pore size of 0.25mm.

4. The method for preparing consolidated soil according to claim 2, wherein when the water content is over 30%, the step of feeding the prepared soil into a crushing and screening all-in-one machine for crushing and screening to obtain prepared soil with a particle size of less than 5mm is omitted.

5. The method for preparing consolidated soil of claim 2, wherein the production mix ratio is: 60-80 parts of prepared soil, 20-40 parts of cementing materials, 0-1 part of additives and 50-70 parts of water, wherein the production mixing proportion is mass ratio; the weight ratio of the water to the (cementing material + prepared soil) is (5-7): 10.

6. the method of claim 1, wherein the cementitious material is at least one of cement clinker, fly ash, steel slag powder, water slag powder, phosphogypsum, fluorgypsum, desulfurized gypsum, slag powder, or lime.

7. A preparation method of bubble consolidated soil is characterized by comprising the following steps:

(2) Preparing standard slurry by adopting various processes of impurity removal, crushing, screening, pulping and sand washing according to the category of raw materials;

(3) Adding a certain proportion of cementing materials into the slurry, and stirring to prepare high-water-to-solid-ratio pumpable consolidated soil slurry;

(4) And (4) conveying the concreted soil slurry to intelligent foaming equipment, adding a foaming agent, stirring, and pumping to a construction site to complete the pouring of the bubble concreted soil.