Grouting material for filling gap between shield shell and soil body and preparation method thereof

Abstract

The invention discloses a grouting material for filling a gap between a shield shell and a soil body and a preparation method of the grouting material, and belongs to the technical field of shield tunnel construction, the grouting material comprises first grout and second grout, and the volume ratio of the first grout to the second grout is 10-5: 1; the first slurry comprises bentonite, water, gum powder, magnesium aluminum silicate and a dispersing agent, and the dispersing agent is one or more of baking soda, calcium chloride, polyacrylamide and polyvinyl alcohol; the second slurry comprises water glass; the first slurry or the second slurry further comprises hydroxypropyl methyl cellulose, and when the second slurry contains the hydroxypropyl methyl cellulose, the second slurry further comprises a dispersing agent. The problem that a gap between the shield tunnel and the surrounding soil body easily causes stratum settlement is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunnel construction, and particularly relates to a grouting material for filling the gap between the shield shell and the soil and a preparation method thereof. Background Art

[0002] During the construction of shield tunnels, on the one hand, the excavation diameter of the shield machine is usually larger than the outer diameter of the shield shell, so a gap will be formed between the excavation contour of the cutter head and the shield shell. On the other hand, due to the presence of turns and slopes in the horizontal and vertical sections of the shield tunneling section, the excavation surface is not a standard circular section, so over-excavation inevitably occurs during tunneling, and a gap will also be formed outside the shield shell, which will in turn cause the soil around the shield shell to deform, and the synchronous grouting at the shield tail cannot suppress this deformation in time. When the shield tunnel construction passes through major risk sources and the corresponding deformation control standards are strict, especially in soft strata, the formation deformation caused by the existence of this gap cannot be ignored, so targeted control measures need to be taken to meet the deformation control requirements.

[0003] The information disclosed in this background art section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0004] In order to overcome the defects of the prior art, the present invention provides a grouting material for filling the gap between the shield shell and the soil and a preparation method thereof to solve the problem that the gap between the shield tunnel and the surrounding soil easily causes ground settlement.

[0005] To achieve the above object, a grouting material for filling the gap between the shield shell and the soil is provided, which includes a first slurry and a second slurry, and the volume ratio of the first slurry to the second slurry is 10 - 5:1; The first slurry includes bentonite, water, gum powder, magnesium aluminum silicate and a dispersant, and the dispersant is one or more of baking soda, calcium chloride, polyacrylamide and polyvinyl alcohol; The second slurry includes water glass; The first slurry or the second slurry further includes hydroxypropyl methylcellulose. When the second slurry contains hydroxypropyl methylcellulose, the second slurry further includes a dispersant.

[0006] Further, the volume ratio of the first slurry to the second slurry is 10:1, and the first slurry includes 1 part by mass of bentonite, 3.5 parts by mass of water, 0.003 part by mass of hydroxypropyl methylcellulose, 0.005 part by mass of gum powder, 0.005 part by mass of magnesium aluminum silicate, and 0.015 part by mass of the dispersant.

[0007] Further, the volume ratio of the first slurry to the second slurry is 10:1. The first slurry comprises 1 part by mass of bentonite, 3.5 parts by mass of water, 0.003 part by mass of hydroxypropyl methylcellulose, 0.005 part by mass of gum powder, 0.005 part by mass of magnesium aluminum silicate, 0.015 part by mass of a dispersant, and the dispersant is polyvinyl alcohol.

[0008] Further, the first slurry further comprises a water reducing agent, and the water reducing agent is one or more of naphthalene-based water reducing agents, polycarboxylate water reducing agents, and calcium lignosulfonate.

[0009] Further, the volume ratio of the first slurry to the second slurry is 10:1. The first slurry comprises 1 part by mass of bentonite, 3.5 parts by mass of water, 0.003 part by mass of hydroxypropyl methylcellulose, 0.005 part by mass of gum powder, 0.005 part by mass of magnesium aluminum silicate, 0.015 part by mass of a dispersant, 0.01 part by mass of a water reducing agent, and the dispersant is polyvinyl alcohol.

[0010] Further, the volume ratio of the first slurry to the second slurry is 5:1. The first slurry comprises 1 part by mass of bentonite, 3.5 parts by mass of water, 0.005 part by mass of gum powder, 0.005 part by mass of magnesium aluminum silicate, 0.01 part by mass of a dispersant, and 0.01 part by mass of a water reducing agent; The second slurry comprises 1 part by mass of sodium silicate, 0.362 part by mass of water, 0.029 part by mass of hydroxypropyl methylcellulose, and 0.048 part by mass of a dispersant; The dispersant in the first slurry and the second slurry is polyvinyl alcohol.

[0011] Further, the bentonite is sodium-based bentonite and / or calcium-based bentonite.

[0012] The present invention provides a preparation method of a grouting material for filling the gap between a shield shell and soil, which is characterized by comprising the following steps: Prepare the first slurry; Prepare the second slurry; Mix the first slurry and the second slurry evenly and then inject them into the gap between the shield shell of the shield machine and the surrounding soil.

[0013] The beneficial effects of the present invention are as follows. The grouting material for filling the gap between the shield shell and the soil body of the present invention contains components that are all common building materials, which are green, environmentally friendly, and non-toxic. The grouting material for filling the gap between the shield shell and the soil body of the present invention has low cost. The grouting material for filling the gap between the shield shell and the soil body of the present invention has appropriate fluidity before the two-component mixing, is easy to pump, and has simple operation. After the two-component mixing, it has certain viscosity and plasticity, and will not quickly flow from the injection point to the front of the cutter head or behind the shield tail. The grouting material for filling the gap between the shield shell and the soil body of the present invention has certain compressive capacity and anti-dilution ability, can play a certain supporting role, can avoid being diluted by groundwater, and this material will not harden, will not lock the shield body, and can reduce the friction between the shield shell and the soil body, which is beneficial to the axis control of the shield machine. The permeability coefficient of the grouting material for filling the gap between the shield shell and the soil body of the present invention is only 0.0421 m / d, has good waterproof performance, can form a waterproof layer around the shield body, and plays a certain waterproof role. The grouting material for filling the gap between the shield shell and the soil body of the present invention can effectively fill the gap between the shield shell and the surrounding soil body, thereby reducing the soil deformation caused by this gap when the shield machine passes through. Description of the Drawings

[0014] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, purposes, and advantages of the present application will become more obvious: Figure 1 It is a grouting construction schematic diagram of the grouting material for filling the gap between the shield shell and the soil body in the embodiment of the present invention. Detailed Embodiments

[0015] The following further elaborates the present application in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. Additionally, it should be noted that for the sake of description, only the parts related to the invention are shown in the drawings.

[0016] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will detail the present application with reference to the drawings and in conjunction with the embodiments.

[0017] The present invention provides a grouting material for filling the gap between the shield shell and the soil body, including a first slurry and a second slurry. The volume ratio of the first slurry to the second slurry is 10 - 5:1.

[0018] The first slurry includes bentonite, water, gum powder, magnesium aluminum silicate, and a dispersant.

[0019] The bentonite is sodium-based bentonite and / or calcium-based bentonite. Among them, the role of bentonite is to serve as the matrix of the grouting material. The montmorillonite content in the bentonite > 70%, and the swelling multiple > 15.

[0020] The main function of the gum powder is to increase the viscosity of the grouting material and keep the colloid in the grouting material stable. The gum powder is a building resin gum powder.

[0021] Magnesium aluminum silicate is an admixture, and its main function is to suspend the solute of the first slurry, prevent sagging, and increase the lubricity of the material. Magnesium aluminum silicate is in white powder form, and the content of magnesium aluminum silicate in the powder is greater than 99%.

[0022] The dispersant is one or more of sodium bicarbonate, calcium chloride, polyacrylamide, and polyvinyl alcohol. Sodium bicarbonate, calcium chloride, polyacrylamide, and polyvinyl alcohol are the main substances for forming the colloid and reacting. Polyvinyl alcohol (PVA) is a cold water-soluble powder with a fineness of 80 mesh.

[0023] The second slurry includes sodium silicate. Sodium silicate is liquid sodium silicate with a Baume degree of 38.5 - 40.

[0024] Sodium silicate is a plasticizer, which mainly plays a role in increasing the plasticity of the material and is also the main substance for the reaction between the first slurry and the second slurry.

[0025] The first slurry or the second slurry further includes hydroxypropyl methylcellulose. When the second slurry contains hydroxypropyl methylcellulose, the second slurry further includes a dispersant.

[0026] The main function of hydroxypropyl methylcellulose in the material is to increase the consistency of the grouting material, increase lubricity and plasticity, protect the colloid, and make the grouting material resistant to water dispersion. Hydroxypropyl methylcellulose (HPMC) is also in white powder form, and its viscosity should be greater than 200,000.

[0027] As a preferred embodiment, the first slurry further includes a water reducing agent. Specifically, the water reducing agent is one or more of naphthalene-based water reducing agents, polycarboxylate water reducing agents, and calcium lignosulfonate.

[0028] The main functions of naphthalene-based water reducing agents, polycarboxylate water reducing agents, and calcium lignosulfonate are to reduce the water consumption and increase the fluidity of the first slurry.

[0029] In order to specifically illustrate the performance of the grouting material for filling the gap between the shield shell and the soil body of the present invention, the following examples are given for illustration. Example 1

[0030] The grouting material for filling the gap between the shield shell and the soil body in this example includes a first slurry and a second slurry. The volume ratio of the first slurry to the second slurry is 10:1.

[0031] Specifically, the first slurry includes 1 part by mass of bentonite, 3.5 parts by mass of water, 0.003 part by mass of hydroxypropyl methylcellulose, 0.005 part by mass of gum powder, 0.005 part by mass of magnesium aluminum silicate, and 0.015 part by mass of dispersant.

[0032] Among them, the dispersant is polyacrylamide.

[0033] The second slurry is sodium silicate.

[0034] The fluidity of the first slurry is 74 mm. Specifically, the fluidity of the slurry is tested using a gypsum-based self-leveling fluidity tester.

[0035] The viscosity of the grouting material for filling the gap between the shield shell and the soil in this embodiment is 32300 mPa·s. Specifically, the viscosity is measured using an NDJ-1 rotational viscometer. Example 2

[0036] The grouting material for filling the gap between the shield shell and the soil in this embodiment includes a first slurry and a second slurry. The volume ratio of the first slurry to the second slurry is 10:1.

[0037] Specifically, the first slurry includes 1 part by mass of bentonite, 3.5 parts by mass of water, 0.003 part by mass of hydroxypropyl methylcellulose, 0.005 part by mass of gum powder, 0.005 part by mass of magnesium aluminum silicate, 0.015 part by mass of dispersant, and the dispersant is polyvinyl alcohol.

[0038] The second slurry is sodium silicate.

[0039] The fluidity of the first slurry is 80 mm. The detection method for the fluidity of the first slurry is the same as that in Example 1.

[0040] The viscosity of the grouting material for filling the gap between the shield shell and the soil in this embodiment is 41000 mPa·s. The detection method for the viscosity of the grouting material is the same as that in Example 1.

[0041] Compared with Example 1, using polyvinyl alcohol as the dispersant increases the viscosity of the grouting material. Example 3

[0042] The grouting material for filling the gap between the shield shell and the soil in this embodiment includes a first slurry and a second slurry. The volume ratio of the first slurry to the second slurry is 10:1.

[0043] Specifically, the first slurry includes 1 part by mass of bentonite, 3.5 parts by mass of water, 0.003 part by mass of hydroxypropyl methylcellulose, 0.005 part by mass of gum powder, 0.005 part by mass of magnesium aluminum silicate, 0.015 part by mass of dispersant, 0.01 part by mass of water reducer, and the dispersant is polyvinyl alcohol.

[0044] The second slurry is sodium silicate.

[0045] The fluidity of the first slurry is 98 mm. The detection method of the fluidity of the first slurry is the same as that in Example 1. Adding a water reducing agent to the grouting material can increase the fluidity of the first slurry.

[0046] The viscosity of the grouting material for filling the gap between the shield shell and the soil in this example is 45000 mPa·s. The detection method of the viscosity of the grouting material is the same as that in Example 1. Example 4

[0047] The grouting material for filling the gap between the shield shell and the soil in this example includes a first slurry and a second slurry. The volume ratio of the first slurry to the second slurry is 5:1.

[0048] Specifically, the first slurry includes 1 part by mass of bentonite, 3.5 parts by mass of water, 0.005 part by mass of gum powder, 0.005 part by mass of magnesium aluminum silicate, 0.01 part by mass of dispersant and 0.01 part by mass of water reducing agent.

[0049] The second slurry includes 1 part by mass of sodium silicate, 0.362 part by mass of water, 0.029 part by mass of hydroxypropyl methylcellulose and 0.048 part by mass of dispersant.

[0050] The dispersant in the first slurry and the second slurry is polyvinyl alcohol.

[0051] The fluidity of the first slurry is 110 mm. The detection method of the fluidity of the first slurry is the same as that in Example 1.

[0052] The viscosity of the grouting material for filling the gap between the shield shell and the soil in this example is 65000 mPa·s. The detection method of the viscosity of the grouting material is the same as that in Example 1.

[0053] Compared with Example 1, by adjusting the proportion of polyvinyl alcohol and improving the ratio of the second slurry, the fluidity of the first slurry is increased and the viscosity of the grouting material is increased.

[0054] In this example, the slurry indexes of the grouting material of the present invention for filling the gap between the shield shell and the soil are as follows: The fluidity of the first slurry is not less than 110 mm within 24 hours. The fluidity of the second slurry is not less than 150 mm within 24 hours.

[0055] The viscosity of the first slurry is not more than 2000 mPa·s within 24 hours. The viscosity of the second slurry is not more than 100 mPa·s within 24 hours.

[0056] The first slurry and the second slurry can react and form quickly within 30 s after mixing to form a plastic material that will not harden and has a high viscosity, with a viscosity up to 65,000 mPa·s and a permeability coefficient of 0.04207 m / d.

[0057] The present invention provides a preparation method of a grouting material for filling the gap between a shield shell and soil, comprising the following steps: S1. Prepare the first slurry.

[0058] S2. Prepare the second slurry.

[0059] S3. As shown in Figure 1 , after uniformly mixing the first slurry and the second slurry, inject them into the gap between the shield shell of the shield machine and the surrounding soil.

[0060] Specifically, in this embodiment, the grouting material is injected into the gap between the shield shell of the shield machine and the surrounding soil by using a grouting device as shown in Figure 1 . The grouting device can prepare the first slurry and the second slurry respectively, can effectively pump the slurry, control the mixing ratio of the first slurry and the second slurry, and inject the mixed grouting material into the radial reserved grouting holes on the shield body of the shield machine, with simple operation.

[0061] Among them, the grouting device includes a storage container 8, a storage container 9, a stirring device 11, a grouting pump 13, a flow controller 15 for a grouting conduit, and a front-end mixing device 16 for double-fluid slurry.

[0062] The storage container 8 and the storage container 9 in the grouting device are exactly the same, and are used for preparing the first slurry and the second slurry and storing the prepared first slurry and second slurry.

[0063] Taking the storage container 8 as an example, it is provided with a feed inlet 12 at the upper part, a slurry outlet 10 at the lower part, and stirring blades 11 inside the storage container. The stirring blades are evenly distributed on a stirring shaft 19, and the stirring shaft 19 is connected to a motor 18 above the container. The motor 18 drives the stirring shaft 19 and the stirring blades 11 to rotate to mix the slurry in the storage container evenly.

[0064] The grouting pump 13 is one of a piston grouting pump, a plunger grouting pump, or a diaphragm grouting pump, and is used for pumping the slurry.

[0065] A flow controller 15 is installed on the grouting conduit 14 and is used for controlling the volumes of the pumped first slurry and second slurry so that they are mixed in a certain proportion.

[0066] The end of the grouting conduit 14 is a front-end mixing device 16 for double-fluid grout, which is a Y-shaped tee. Two of the inclined pipes are respectively connected to the grouting conduits of the first grout and the second grout for receiving the first grout and the second grout pumped, and the other straight pipe is connected to the radial grouting hole 17 above the shield body. The first grout and the second grout are mixed in this pipe and then injected into the gap between the shield shell and the soil through the radial grouting hole 17.

[0067] Taking Example 4 as an example, the steps for preparing the first grout are as follows: First, add 1 part of bentonite and 3.5 parts of water to the first grout storage container through the feed inlet, then start the motor to drive the stirring shaft and the stirring blades to rotate to mix them evenly; then add 0.005 part of magnesium aluminum silicate and 0.005 part of gum powder to the first grout storage container and mix them evenly in the same way; finally, add 0.01 part of polyvinyl alcohol and 0.01 part of water reducing agent to the first grout storage container and mix them evenly.

[0068] Taking Example 4 as an example, the steps for preparing the second grout are as follows: Add 1 part of sodium silicate, 0.029 part of hydroxypropyl methylcellulose and 0.048 part of polyvinyl alcohol to the second grout storage container through the feed inlet, start the motor to stir them evenly, then add 0.362 part of water and continue to stir in the same way until they are stirred evenly.

[0069] In the construction of shield tunnels, first prepare the first grout and the second grout for standby and keep stirring the first grout and the second grout to maintain their fluidity. Then start the grouting pump while the shield machine is advancing, so that the first grout and the second grout enter the grouting conduit from the slurry outlet below the storage container, and use the grouting pump and the grouting conduit to pump the slurry. Control the volume ratio of the first grout and the second grout by adjusting the flow controller, transport the first grout and the second grout to the front-end mixing device for double-fluid grout. The first grout and the second grout are injected into the straight pipe through the inclined pipes of the front-end mixing device and mixed in the straight pipe, and finally injected outside the shield shell through the radial grouting hole at the 12 o'clock position above the shield shell to fill the gap between the shield shell and the surrounding soil, and the filling rate is 150% - 200%, and the grouting pressure is controlled at 0.3 MPa - 0.5 MPa.

[0070] The actual operation of grouting includes the following steps: (1) At the 12 o'clock position above the shield shell of the shield machine used in the construction, open a vertically arranged radial grouting hole with a diameter of 50 mm. And assemble the grouting device according to the figure.

[0071] (2) Prepare the first grout and the second grout respectively.

[0072] Taking Example 4 as an example, the first slurry preparation step: First, add 1 part of bentonite and 3.5 parts of water into the first slurry storage container through the feed inlet, then start the motor to drive the stirring shaft and stirring blades to rotate and mix them evenly; then add 0.005 parts of magnesium aluminum silicate and 0.005 parts of gum powder into the first slurry storage container, and mix them evenly in the same way; finally, add 0.01 part of polyvinyl alcohol into the first slurry storage container and mix it evenly.

[0073] The second slurry preparation step: Add 1 part of water glass, 0.029 part of hydroxypropyl methylcellulose and 0.048 part of polyvinyl alcohol into the second slurry storage container through the feed inlet, start the motor and stir them evenly, then add 0.362 part of water, and continue to stir in the same way until evenly stirred. After the first slurry and the second slurry are prepared, they are stored in the storage container for standby, and the first slurry and the second slurry are continuously stirred to maintain the fluidity of the first slurry and the second slurry.

[0074] (3) Start the shield machine and make the shield machine advance forward according to the conventional shield construction method. During the shield construction process, open the control valves of the first slurry and the second slurry injection pipelines and the injection pumps, pump the first slurry and the second slurry, and control the injection pressure at 0.3 MPa to 0.5 MPa. Control the volume ratio of the first slurry to the second slurry at 5:1 by adjusting the flow controller, transport the first slurry and the second slurry to the front mixing device of the double-fluid slurry, and the first slurry and the second slurry are injected into the straight pipe through the inclined pipe of the front mixing device and mixed in the straight pipe, and finally injected into the outside of the shield shell through the radial grouting hole at the 12 o'clock position above the shield shell to fill the gap between the shield shell and the surrounding soil. The injection volume is adjusted according to the tunneling speed of the shield machine to keep the filling rate at 150% - 200%.

[0075] (4) Carry out other processes such as segment assembly and synchronous grouting at the shield tail according to the conventional shield construction method. When the shield machine stops tunneling, close the control valves of the first slurry and the second slurry pipelines and stop grouting.

[0076] The grouting material for filling the gap between the shield shell and the soil of the present invention, the components of which are all common building materials, are green, environmentally friendly and non-toxic.

[0077] The grouting material for filling the gap between the shield shell and the soil of the present invention has a low cost. Calculated according to the injection volume of 1 m 3 The cost of the grouting material for filling the gap between the shield shell and the soil of the present invention is only 478.7 yuan, while the cost of the Claymax material on the market is about 1670 - 3270 yuan per 1 m 3 injection volume due to different prices.

[0078] The grouting material for filling the gap between the shield shell and the soil in the present invention has appropriate fluidity before the mixing of the two liquids, is easy to pump, and has simple operation. After the mixing of the two liquids, it has certain viscosity and plasticity and will not quickly flow from the injection point to the front of the cutter head or behind the shield tail.

[0079] The grouting material for filling the gap between the shield shell and the soil in the present invention has certain compressive capacity and anti-dilution capacity, can play a certain supporting role, can avoid being diluted by groundwater, and this material will not harden, will not lock the shield body, and can reduce the friction between the shield shell and the soil, which is beneficial to the control of the axis of the shield machine.

[0080] The permeability coefficient of the grouting material for filling the gap between the shield shell and the soil in the present invention is only 0.0421 m / d, has good waterproofness, can form a waterproof layer around the shield body, and plays a certain waterproof role.

[0081] The grouting material for filling the gap between the shield shell and the soil in the present invention can effectively fill the gap between the shield shell and the surrounding soil, thereby reducing the soil deformation caused by this gap when the shield machine passes through.

[0082] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A grouting material for filling the gap between the shield shell and the soil mass, characterized in that, It includes a first slurry and a second slurry, and the volume ratio of the first slurry to the second slurry is 10 to 5:1; The first slurry includes bentonite, water, gum powder, magnesium aluminum silicate and a dispersant, and the dispersant is one or more of sodium bicarbonate, calcium chloride, polyacrylamide and polyvinyl alcohol; The second slurry includes sodium silicate; The first slurry or the second slurry further includes hydroxypropyl methylcellulose. When the second slurry contains hydroxypropyl methylcellulose, the second slurry further includes a dispersant.

2. The grouting material for filling the gap between the shield shell and the soil according to claim 1, characterized in that, The volume ratio of the first slurry to the second slurry is 10:

1. The first slurry includes 1 part by mass of bentonite, 3.5 parts by mass of water, 0.003 part by mass of hydroxypropyl methylcellulose, 0.005 part by mass of gum powder, 0.005 part by mass of magnesium aluminum silicate, and 0.015 part by mass of the dispersant.

3. The grouting material for filling the gap between the shield shell and the soil according to claim 1, wherein The volume ratio of the first slurry to the second slurry is 10:

1. The first slurry includes 1 part by mass of bentonite, 3.5 parts by mass of water, 0.003 part by mass of hydroxypropyl methylcellulose, 0.005 part by mass of gum powder, 0.005 part by mass of magnesium aluminum silicate, 0.015 part by mass of the dispersant, and the dispersant is polyvinyl alcohol.

4. The grouting material for filling the gap between the shield shell and the soil according to claim 1, wherein The first slurry further includes a water reducing agent, and the water reducing agent is one or more of naphthalene series water reducing agents, polycarboxylate water reducing agents, and calcium lignosulfonate.

5. The grouting material for filling the gap between the shield shell and the soil according to claim 4, characterized in that, The volume ratio of the first slurry to the second slurry is 10:

1. The first slurry includes 1 part by mass of bentonite, 3.5 parts by mass of water, 0.003 part by mass of hydroxypropyl methylcellulose, 0.005 part by mass of gum powder, 0.005 part by mass of magnesium aluminum silicate, 0.015 part by mass of the dispersant and 0.01 part by mass of the water reducing agent, and the dispersant is polyvinyl alcohol.

6. The grouting material for filling the gap between the shield shell and the soil mass according to claim 4, characterized in that, The volume ratio of the first slurry to the second slurry is 5:

1. The first slurry includes 1 part by mass of bentonite, 3.5 parts by mass of water, 0.005 part by mass of gum powder, 0.005 part by mass of magnesium aluminum silicate, 0.01 part by mass of the dispersant and 0.01 part by mass of the water reducing agent; The second slurry includes 1 part by mass of sodium silicate, 0.362 part by mass of water, 0.029 part by mass of hydroxypropyl methylcellulose and 0.048 part by mass of the dispersant; The dispersant in the first slurry and the second slurry is polyvinyl alcohol.

7. The grouting material for filling the gap between the shield shell and the soil according to claim 1, wherein The bentonite is sodium-based bentonite and / or calcium-based bentonite.

8. A method for preparing a grouting material for filling the gap between a shield shell and soil as described in any one of claims 1 to 7, characterized in that, It includes the following steps: Prepare the first slurry; Prepare the second slurry; Mix the first slurry and the second slurry evenly and then inject them into the gap between the shield shell of the shield machine and the surrounding soil.

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