JP4242670B2 - Soil-stabilized soil and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fluidized soil used for backfilling the ground, and more particularly to a soil-stabilized soil having a water stop function and a method for producing the soil.
[0002]
[Prior art]
A structure to be buried in the ground after excavation, such as a subway structure, a common ditch, or an underground building structure, needs to be provided with an outer waterproofing work on the outer periphery of the constructed structure in order to prepare for water leakage or inundation. As this outer waterproofing work, there are a coating waterproofing work, a sheet waterproofing work, a mortar waterproofing work, a bentonite waterproofing work and the like.
In the outer waterproofing work, a sheet waterproofing work in which a rubber-based waterproofing sheet is attached to the outer periphery of a structure with an adhesive is often used as a highly reliable waterproofing work. In addition, a waterproof coating method for fusing asphalt-based materials as a coating film and a mortar waterproofing method for spraying mortar are sometimes adopted as economical methods.
On the other hand, fluidized soil has traditionally been used for backfilling confined spaces around underground structures. Here, fluidized soil is produced by mixing construction-generated soil or mountain sand generated at a construction site made of sand, clay, silt or loam with cement-based solidified material and has high fluidity. A filler that does not require compaction.
Researches for enhancing the waterproofing effect of the fluidized soil have been conducted by the inventors of the present application, and a paper of Non-Patent Document 1 is disclosed.
[0003]
[Non-Patent Document 1]
Goro Kuno, Tsunetaro Iwabuchi, Akihiko Izumi, 3 others, “Development of water-proofing method using fluidized soil (Part 1-Applicability of mortar waterproofing agent)”, 37th Geotechnical Society Presentation 2014 Proceedings of the presentation, Geotechnical Society of Japan, July 16-18, 2002, K-06, 436, p. 865-866
[0004]
[Problems to be solved by the invention]
The above-described conventional waterproofing work has the following problems.
<A> Currently, the sheet waterproofer, which is widely used as an outer waterproofer, has a problem that the sheet is easily damaged by the protrusions, and the water-stopping property is extremely lowered when it is damaged. Further, it is difficult to adhere to wet surfaces and uneven surfaces. Furthermore, since it is necessary to provide a protective layer on the outside of the sheet and the material cost is high, there is a problem that the construction cost increases.
<B> Asphalt-based coating waterproofing works have many years of construction experience as an economical construction method, but require a high heat treatment, and there is a problem that the construction environment deteriorates due to generation of smoke and odor. Moreover, it has the same problems as the sheet waterproofing work, such as the point that requires a dry construction surface and the need to provide a protective layer.
<C> Mortar waterproofing has the advantage of being economical and having good workability. However, since the mortar waterproofing is easy to crack and peel off, the waterproof performance is likely to deteriorate.
<D> Although there is a water-impervious wall construction method that builds underground walls by mixing solidified material with slurried slurry, the water permeability is on the order of ^{10-5 to -6} cm / sec. It is not impermeable enough to be used.
<E> Fluidized soil causes breathing in which water used for mixing rises after placement. This breathing causes a cold joint at the joint, and as a result, the water stop function is lowered.
<F> Soil cement, etc., in which solidified material is mixed with fluidized soil and slurry in situ soil, has a large gap, so if it is in water, elution of the solidified material into the water by passing through water However, in the air, neutralization with carbon dioxide proceeds gradually, and in the long term, the initial solidification state tends to deteriorate.
[0005]
OBJECT OF THE INVENTION
The present invention has been made to solve the above-described conventional problems, and an object thereof is to provide a soil-stabilized soil having a water-stopping performance that can be adopted as an outer waterproofing work and a method for manufacturing the soil. . In particular, an object of the present invention is to provide a soil-stabilized soil capable of ensuring a water-impermeable layer having a water permeability of the order of 10 ^{−9 to −10} cm / sec and a method for producing the soil.
Another object of the present invention is to provide a highly durable soil-stabilized soil that can maintain a stable water-stopping performance and a solidified state over a long period of time, and a method for producing the soil.
It is another object of the present invention to provide a soil-stabilized soil excellent in workability and capable of performing economical waterproofing and a method for producing the soil. In particular, it is an object of the present invention to provide a soil-stabilized soil and a method for producing the soil that can be easily subjected to a high-quality outer waterproofing work that is not easily affected by the degree of construction skill.
It is another object of the present invention to provide a soil-stabilized soil in which breathing hardly occurs after placement and a method for producing the soil.
The present invention achieves at least one of these objects.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the soil-stabilized soil of the present invention is a treated soil that is a main raw material, water glass, polyvinyl alcohol, ethylene vinyl alcohol, acrylic polymer, or urethane. A polymer solution obtained by liquefying a molecular agent, water, and a cement-based, lime-based, or gypsum-based solidified material are mixed to have a wet density of 1.3 to 1.9 g / cm ^3. is there. Here, the soil to be treated refers to a material which is a main raw material for soil-stabilized soil such as construction generated soil generated at a construction site made of sand, clay, silt or loam, in-situ ground or collected mountain sand.
Moreover, you may add the adjustment muddy water which adjusted the muddy water specific gravity manufactured to melt | dissolve fine-grained soil in water to 1.1-1.3 to the above-mentioned soil-stabilized soil. Furthermore, it is preferable that the weight of the water glass is up to 8%, preferably up to 5% of the total water weight, and the weight of the polymer agent is 0.3% to 3% of the total water weight. Here, the total water weight means the weight of all water contained in the soil-stabilized soil. At the time of blending, the amount of each material used is calculated from the amount of water contained in 1 m ^{3 of} soil-stabilized soil. Therefore, the amount of water to be added varies depending on the moisture content of the soil to be treated.
[0007]
In the method for producing a soil-stabilized soil according to the present invention, water glass and a polymer agent selected from polyvinyl alcohol, ethylene vinyl alcohol, acrylic polymer, and urethane are liquefied in the soil to be treated as a main raw material. A polymer liquid and water are added to produce a slurry-like mixed mud, and a cement-based, lime-based or gypsum-based solidifying material is added to the mixed mud and kneaded, and the wet density is 1.3 to 1. This is a method for producing a soil-stabilized soil of .9 g / cm ³ .
Furthermore, muddy water produced by adding water to the soil to be treated as a main raw material, or muddy water produced by dissolving fine-grained soil in water, adjusted muddy water adjusted to 1.1 to 1.3, water glass and , A polymer liquid obtained by liquefying any one of a polymer agent selected from the group consisting of polyvinyl alcohol, ethylene vinyl alcohol, acrylic polymer, and urethane, to produce a slurry-like mixed mud water. Alternatively, it is a method for producing a soil-stabilized soil having a wet density of 1.3 to 1.9 g / cm ³ by adding a gypsum-based solidifying material and kneading.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0009]
<I> Soil-stabilized soil Soil-stabilized soil is one that has improved the water stopping performance of fluidized soil or in-situ ground. The conventional fluidized soil has a permeability of about 10 ^{−5 to −6} cm / sec, although the permeability is lower than that of ordinary backfill soil, and is equivalent to the permeability of silt or clay soil. It is. For this reason, although the water-stopping performance has improved compared to the state of the soil where construction has occurred, it does not have the water-stopping performance to the extent that it can be used as an outer waterproofing work, and it was necessary to use it together with a sheet waterproofing work etc. . Therefore, by converting the conventional fluidized soil and the in-situ ground to the soil-stabilized soil according to the present invention, a high water-stopping performance that can be adopted as an external waterproofing work alone is secured. As a result, the elution of the solidified substance into water can be suppressed and the solidified state can be maintained for a long period of time, so that a highly durable soil-stabilized soil can be obtained.
Soil-stabilized soil is produced by mixing soil to be treated as a main raw material, water glass, a polymer solution obtained by liquefying a polymer agent, and a solidifying material, and has a wet density of 1.3 to 1. 9 g / cm ³ . The reason for specifying the density is that the improvement of the water stop performance by the density effect is also expected. In particular, when used as fluidized soil, the wet density is preferably 1.5 g / cm ³ or more, and most preferably 1.8 g / cm ³ or more.
Each component will be described below.
[0010]
<B> Treated soil Treated soil is a material used as the main raw material for soil-stabilized soil such as construction-generated soil, in-situ ground, or collected mountain sand generated at construction sites consisting of sand, clay, silt or loam. Say.
The construction generated soil may be soil generated from the local ground to be backfilled or may be soil transported from another construction site. The in-situ ground refers to the ground deposited in the in-situ position, and the in-situ ground is converted to a soil-stabilized soil by mixing the cement-based solidified material and the in-situ ground in the ground improvement method.
Moreover, the amount of water required for the soil-stabilized soil is the weight of all the water contained in the soil-stabilized soil. Therefore, the amount of water added at the time of production is calculated by subtracting the water content of the soil to be treated and the weight of the water used for the water glass, the polymer solution and the adjusted mud from the amount of water required.
[0011]
<C> Water glass Water glass is an alkali salt of silicic acid and usually refers to a liquid material mainly composed of sodium silicate. Since it has little impact on human health and the environment, it has traditionally been used in chemical injection methods.
Water glass is a colorless and transparent aqueous solution that condenses in tens of seconds to several tens of minutes when poured into the soil. Because of its high adhesive strength, it is also used as an adhesive for artificial stone and glass.
Water glass is used as a water glass solution diluted with water.
[0012]
<D> Polymer solution The polymer solution is a solution obtained by dissolving or dispersing a polymer agent in water or a solvent.
As the polymer agent, polyvinyl alcohol (hereinafter referred to as PVA), ethylene vinyl alcohol (hereinafter referred to as EVA), acrylic polymer or urethane can be used. Among these, PVA is most suitable as a polymer agent used for soil-stabilized soil.
PVA is a kind of water-soluble polymer, and is made of a hydrocarbon having a triple bond in the acetylene molecule. Acetylene itself is produced by a reaction between calcium carbide (calcium carbide) and water. PVA is prepared by hydrolysis of polyvinyl esters such as polyvinyl acetate. PVA is used for adhesives, fibers, paper paste, solution emulsification, suspension, thickeners, and the like.
EVA is also called an ethylene vinyl alcohol copolymer, and is a saponified product obtained by hydrolyzing an ethylene vinyl acetate copolymer. Since EVA is a hydrophilic polymer having a hydroxyl group, it has excellent adhesive strength.
The acrylic polymer is also called an acrylic polymer, and is used as a dispersant, a thickener or an adhesive. Acrylic acid esters and methacrylic acid esters can be used.
Urethane is also called a urethane resin and is a polymer having a urethane bond in a molecular chain. Obtained by polyaddition of fatty acid diamines or glycols and diisocyanates. It is mainly used for foam cushioning materials, and is also used for paint raw materials and adhesives.
[0013]
Some powdery polymer agents are not easily dissolved in water and difficult to disperse evenly when mixed with the soil to be treated. use. PVA is water-soluble, for example, used as a PVA aqueous solution having a concentration of 10%. Further, EVA, acrylic polymer or urethane which is hardly soluble in water is used by dispersing in a solution to form a polymer emulsion or using a solvent to form a polymer solution.
[0014]
<E> Adjusted muddy water Adjusted muddy water is muddy water produced by dissolving fine-grained soil in water, and produced by adjusting the specific gravity of the muddy water to 1.1 to 1.3.
Fine-grained soil refers to clay such as alluvial clay generated at construction sites, loam such as Kanto loam, silt, bentonite and the like. Muddy water is produced by dissolving one or more types of fine-grained soil in water.
[0015]
<F> The amount of the solidifying material solidifying material, for example in the case of solidifying material cementitious 20~200kg respect fluidizing treated soil 1 m ^3, the fluidizing treated soil 1 m ³ in the case of lime or gypsum-based solidifying material 150 to 400 kg.
In addition, as in the SMW method and the TRD method, when the underground wall is constructed by mixing the solidified material with slurry slurried in the ground or in the excavation trench, 300 to 400 kg for 1 m ^{3 of} muddy water (slurry). The cement-based solidifying material may be added.
In the fluidized soil with a high density, the amount of the solidifying material added is reduced as compared with the conventional one, and an amount of the solidifying material sufficient to temporarily secure the strength required for construction is added. As a result, the mechanical properties of the fluidized soil can be made the properties inherent to the soil.
[0016]
<G> Method for Producing Soil Stabilized Soil First, a soil to be treated generated from a construction site as a main raw material or a muddy water produced by adding water to the soil to be treated is prepared. Moreover, the adjusted muddy water is produced as necessary. And water glass and a polymer liquid are mixed with muddy water or adjustment muddy water.
When a water glass solution diluted with water is added to muddy water or conditioned muddy water, the water decreases due to the hydration reaction with the cement to be added later, the viscosity of the water glass increases, the concentration of the water glass increases and the water glass concentration increases. It is thought to restrain movement. Furthermore, since water glass has the effect | action which accelerates | stimulates a hydration reaction, the effect which reduces water permeability is expressed at an early stage. Moreover, by adding a polymer solution, the viscosity of water can be increased by the thickening action of the dissolved polymer agent. And since the solidifying material to add also hydrates and consumes water, the density | concentration of a polymer liquid becomes high and can restrict | limit the movement of water.
Even if each of water glass and polymer solution is added alone, the water permeability can be lowered as compared with the conventional fluidized soil, but by combining them, the water permeability can be drastically lowered. That is, when the polymer agent and water glass are mixed, they chemically react and gel, so that the movement of water in the gap is restrained at a very high level as compared with the case where each material is used alone. As a result, it is possible to construct a water-impermeable layer having a water permeability coefficient on the order of 10 ^{−9 to −10} cm / sec so that it can be used alone as an outer waterproofing work. Accordingly, the order of mixing the water glass and the polymer solution may be any one, but it is preferable to avoid mixing at the same time. This is because if the water glass and the polymer agent come into contact with each other before one of the materials is sufficiently dispersed in the muddy water or the adjusted muddy water, there is a possibility that a gelled mass may be formed by a chemical reaction on the spot.
As can be seen from the fact that the saturated soil with a wet density of 1.6 g / cm ³ generally has a gap of about 70%, and the saturated soil with a wet density of 1.3 g / cm ³ has a gap of about 80%, It accounts for a very large proportion of the soil with stable soil treatment. If the water in this part is altered, the water stopping performance of the soil with stable soil treatment will be greatly improved.
[0017]
Then, a cement-based, lime-based, or gypsum-based solidifying material is added to the mixed mud water to which water glass and polymer liquid have been added, and kneaded to obtain a soil-stabilized soil. If the soil-stabilized soil used for backfilling can be used as an external waterproofing work for underground structures, it is not necessary to perform an external waterproofing work separately. Moreover, since it is only necessary to fill the fluidized soil-stabilized soil, there is almost no difference in the quality of construction depending on the skill level. Moreover, since the filled soil-stabilized soil covers the structure in layers, even if the water supply path is partially developed, it is blocked by other layers, so that the waterproof performance is stably maintained.
[0018]
Moreover, by mixing the water glass and the polymer agent, the toughness of the soil-stabilized soil is improved, and the deformation of the underground structure and the like can be followed.
Conventionally, the impermeable walls and ground improvement by cement-based solidification materials have been positioned as temporary materials, but by providing high water-stopping performance, the dissolution of Ca in fluidized soil is prevented and deteriorated. Can be suppressed.
Up to this point, we have explained the addition of water glass and polymer solution as a waterproofing agent to the fluidized soil, but in addition to this, it has a high water content ratio that ensures 90% or more saturation like alluvial clay ground. In-situ clay ground can also be converted into soil-stabilized soil with high water stopping function.
[0019]
Hereinafter, the characteristics of the soil-stabilized soil of the present invention will be described with reference to test results.
[0020]
<I> Comparison of hydraulic conductivity by type of waterproofing agent (Fig. 1)
In FIG. 1, the result compared about the water transmission coefficient at the time of adding various kinds of waterproofing agent to fluidization processing soil is shown. Here, since the hydraulic conductivity of the fluidized soil also changes depending on the density, the horizontal axis indicates the density.
From FIG. 1, the hydraulic conductivity of fluidized soil with a low density without adding a waterproofing agent or fluidized soil with an inorganic mortar waterproofing agent is on the order of 10 ⁻⁶ cm / sec, and the waterproof performance is low. I understand that. However, the hydraulic conductivity of the fluidized soil to which water-soluble polymer (PVA) or water glass is added is on the order of 10 ⁻⁷ cm / sec even if the density is low, and the hydraulic conductivity decreases by one order and the water stopping performance is reduced. improves.
However, when a water-soluble polymer (PVA) or water glass is used alone, it is on the order of 10 ⁻⁸ cm / sec even if the density is increased to 1.6 g / cm ³ , and it is used alone for the outer waterproofing work. It ’s difficult.
However, when a water-soluble polymer (PVA) and water glass are mixed and added, the water permeability is further reduced by 1 to 2 orders, and the water ^stoppage performance is drastically reduced to the order of 10 ^{−9 to −10} cm / sec. Improved water permeability. This is an effect obtained by the chemical reaction between the polymer agent and water glass as described above and gelation, which is different from the impermeability caused by the increase in viscosity when the waterproofing agent is used alone. is there. For this reason, it is thought that the dramatic water stop performance beyond the extension line when a waterproofing agent is used alone was obtained.
This water-stopping effect can also be obtained when ethylene vinyl alcohol (EVA), acrylic polymer or urethane is used as the polymer agent.
[0021]
<B> Study of fluidity PVA is considered to be the most preferred polymer agent among the polymer agents described above because it has a fluidity promoting effect. FIG. 2 is a curve drawn with the amount of PVA added on the horizontal axis and the flow value variation ratio serving as an indicator of fluidity on the vertical axis. FIG. 2 also shows that the flow value increases as the amount of PVA added increases.
When the soil-stabilized soil of the present invention is used as the fluidized soil, it is preferable to set the fluidity flow value to 160 to 250 mm in order to ensure workability such as fillability. However, water glass is viscous, and if the amount added exceeds 5%, the viscosity of the soil stabilized soil will rapidly increase and fluidity will decrease, and if it exceeds 8%, it will be practical for use as fluidized soil. It will not be right. However, when PVA is added at the same time, a predetermined fluidity can be secured by offsetting the fluidity promoting effect of PVA.
[0022]
<C> Examination of toughness FIG. 3 shows fracture strains in the case of adding PVA and in the case of fluidized soil with no waterproofing agent added.
From FIG. 3, it can be seen that the strain at the time of destruction of the soil-stabilized soil increases in proportion to the increase in the amount of addition due to the addition of the polymer agent. This is considered to be due to the fact that the viscosity inside the gap was increased by the addition of the polymer agent.
FIG. 4 shows a soil-stabilized treatment in which PVA is not added and PVA is added at a weight of 0.5, 1.0, 1.5, 3.0, 6.0% of the total water weight. The result of uniaxial compression test of soil is shown. Here, the total water weight means the weight of all water contained in the soil-stabilized soil. That is, in addition to the water added at the time of mixing, the water content originally contained in the soil to be treated and the amount of water used for the polymer solution or the water glass diluent are also included in the total water weight.
As a result, the soil-stabilized soil to which PVA of 3.0, 6.0% of the total water weight is added continues to maintain the peak strength even after breakage, and the strength decreases to about 10% (not shown). I knew it was n’t there. Therefore, it was found that when PVA is added alone in consideration of other experimental results, the toughness of the soil stabilized soil is improved by adding about 3% to 12% of the total water weight.
[0023]
<D> Examination of breathing rate In order to ensure the separation resistance of the material, it is preferable to set the breathing rate to less than 1%. The breathing rate can be determined according to the Japan Society of Civil Engineers standard "Breathing rate and expansion test method of prepacked concrete injection mortar" (JSCE-1986). Moreover, it can also estimate from the kind of to-be-processed soil, the sum total of the fine-grained soil content and solidification material, and the ratio of water which are contained in the soil stabilization processing soil.
In particular, it is preferable that no breathing occurs because the occurrence of breathing leads to a decrease in water stoppage.
It was confirmed in all compounding experiments that no breathing occurred in the soil stabilized soil when the polymer solution and water glass were added. Moreover, when the specimen was observed, the surface of the soil-stabilized soil seemed to be dry.
[0024]
<E> Examination of density effect FIG. 5 shows the relationship between the pore ratio and the permeability coefficient of the soil-stabilized soil to which PVA is added. A large gap ratio means that the density is small, so it can be said that the relationship is between the density and the hydraulic conductivity.
From FIG. 5, it can be seen that the water permeability increases as the gap ratio of the soil-stabilized soil increases and the water stopping performance decreases. The amount of change in the hydraulic conductivity is large, and it can be said that the hydraulic conductivity changes by 1 to 2 orders due to the difference in density. However, the increase in density causes an increase in costs in the production, transportation and placement of soil-stabilized soil, so it is uneconomical to improve the water-stopping performance only by the density effect. And expect a synergistic effect.
[0025]
<F> Examination of addition amount of waterproofing agent It can be seen from FIG. 6 that the water permeability decreases as the addition amount of the polymer agent increases. Even when water glass is added alone, the result having the same tendency as in FIG. 6 is obtained.
Moreover, in FIG. 7, the result of having examined about the mixing ratio of water glass and PVA is shown.
When mixing 5% or more of water glass with respect to the weight of water contained in 1 m ^{3 of} soil-stabilized soil, the viscosity increases too much and the flow value decreases, and if it exceeds 8%, it becomes difficult to place. The upper limit of water glass mixing is about 8%.
And when water glass and PVA are mixed, water glass acts as a main agent and PVA acts as an auxiliary agent, and lowers the water permeability coefficient of the soil-stabilized soil.
It can be seen from FIG. 7 that the addition amount of PVA is an appropriate amount of about 0.3 to 1.0%, and that water impermeability is weakened when 3% or more is mixed. Therefore, the addition amount of PVA is preferably 0.3 to 3.0%.
[0026]
【The invention's effect】
Since the soil-stabilized soil and the manufacturing method thereof according to the present invention are as described above, the following effects can be obtained.
<I> The water stopping performance of the soil-stabilized soil can be dramatically improved by mixing the polymer solution and water glass. As a result, the soil-stabilized soil can be used as it is as an outer waterproofing work for the underground structure.
<B> By increasing the water stopping performance of the soil with stable soil treatment, elution of the solidified substance into the water due to the passage of the permeated water and neutralization with carbon dioxide can be prevented. For this reason, the solidified state of the soil-stabilized soil can be maintained for a long time, and the durability is improved.
<C> The outer waterproofing work can be performed only by filling the slurry-like soil-stabilized soil. For this reason, it is excellent in workability and is economical compared with other methods.
[Brief description of the drawings]
FIG. 1 is a comparison diagram of water permeability coefficient according to the type and density of a waterproofing agent to be added.
FIG. 2 is a graph showing the relationship between the amount of PVA added and the flow ratio fluctuation ratio.
FIG. 3 is a graph showing the relationship between the polymer agent addition amount and fracture strain.
FIG. 4 is a diagram showing the relationship between compressive strain and compressive strength for each amount of PVA added.
FIG. 5 is a diagram showing the relationship between the pore ratio of the soil-stabilized soil to which PVA is added and the hydraulic conductivity.
FIG. 6 is a graph showing the relationship between the polymer agent addition amount and the water permeability coefficient.
FIG. 7 is a diagram showing the relationship between the mixing ratio of PVA and water glass and the water permeability.

Claims (5)

Treated soil as the main raw material,
Water glass,
A polymer liquid obtained by liquefying any one of polyvinyl alcohol, ethylene vinyl alcohol, acrylic polymer, and urethane; and
water and,
Cement-based, lime-based or gypsum-based solidifying material is mixed,
Soil-stabilized soil having a wet density of 1.3 to 1.9 g / cm ³ . The soil-stabilized soil according to claim 1, wherein adjusted mud water prepared by dissolving fine-grained soil in water and adjusted to a mud specific gravity of 1.1 to 1.3 is added. The weight of the water glass is up to 8% of the total water weight, and the weight of the polymer agent is 0.3% to 3% of the total water weight. Soil stabilized soil. To the treated soil that is the main raw material, water glass, a polymer solution obtained by liquefying any one of polyvinyl alcohol, ethylene vinyl alcohol, acrylic polymer or urethane, and water are added to form a slurry. Producing mixed mud water,
Add cement-based, lime-based or gypsum-based solidifying material to the mixed mud and knead,
A method for producing soil-stabilized soil, which comprises soil-treated soil having a wet density of 1.3 to 1.9 g / cm ³ . Muddy water produced by adding water to the soil to be treated as the main raw material, or muddy water produced by dissolving fine-grained soil in water, adjusted muddy water adjusted to 1.1 to 1.3, water glass, polyvinyl A slurry-like mixed mud water is produced by adding a polymer solution obtained by liquefying any polymer agent of alcohol, ethylene vinyl alcohol, acrylic polymer or urethane,
Cement-based, lime-based or gypsum-based solidifying material is added to the mixed mud and kneaded to produce a soil-stabilized soil having a wet density of 1.3 to 1.9 g / cm ^3. Method.

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