Hydrodynamic environment resistant dispersion-resistant micro-expansion grouting material and preparation method thereof

Abstract

The present application relates to the technical field of grouting material, and especially relates to a kind of anti-dispersion micro-expansion grouting material in dynamic water environment and a preparation method thereof.The component A of the grouting material is mainly composed of the following raw materials in weight percentage: gel material with the property of volcanic ash 120-160 parts, retarder 3-5 parts, magnesium oxide 10-15 parts, citric acid 0.5-2 parts, aluminum sulfate 5-8 parts, sodium fluoride 1-2 parts, gelatin 0.5-1 part, and water 70-100 parts;the component B is mainly composed of the following raw materials in weight percentage: polyacrylamide 4-8 parts, polyacrylic acid derivative salt 5-10 parts, alcohol polysaccharide 1-2 parts, water glass 40-100 parts, and water 30-50 parts;the magnesium oxide, aluminum sulfate, gelatin and sodium fluoride in the component A are prepared into core-shell anti-dispersion particles in advance.The present application can solve the problems of poor anti-washing and anti-dispersion ability, low retention rate, and poor durability of stone body of traditional cement-based grouting material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grouting materials, in particular to a micro-expansion grouting material resistant to dispersion in a dynamic water environment and a preparation method thereof. BACKGROUND

[0002] The hydrogeological structure in a dynamic water environment area is complex. The stratum rock mass is affected by the underground dynamic water circulation displacement, mechanical erosion stress and seepage effect for a long time. The chemical composition and minerals of the stratum are seriously corroded and damaged mechanically, resulting in a large number of broken zones hidden therein. The karst broken zone generally has the characteristics of strong water enrichment, loose structure, low bearing capacity under the action of the dynamic water environment, and often contains a large amount of filling medium such as silt. Once exposed, it is easy to induce water inrush and silt gushing, and further cause major disasters such as water inrush and silt gushing in underground engineering, large-scale ground subsidence, deformation and settlement of surface structures, etc., causing serious damage to production safety and regional environment.

[0003] The grouting material for the water inrush disaster in the karst area of the dynamic water environment underground engineering (tunnel engineering, mining area, etc.) is mainly used to prevent groundwater seepage. The traditional cement-based grouting material has poor resistance to erosion and dispersion, low retention rate, and poor durability of the stone body when it is used in the dynamic water environment of the karst area of the dynamic water environment underground engineering. It is difficult to provide core material support for the dynamic water plugging and grouting reinforcement of the water inrush disaster control project in the karst area of the dynamic water environment underground engineering (mining area). SUMMARY

[0004] The present application aims to provide a micro-expansion grouting material resistant to dispersion in a dynamic water environment and a preparation method thereof, which overcomes the shortcomings of the prior art, solves the problems of poor resistance to erosion and dispersion, low retention rate, and poor durability of the stone body of the traditional cement-based grouting material, and provides core material support for the dynamic water plugging and grouting reinforcement of the water inrush disaster control project in the karst area of the dynamic water environment underground engineering.

[0005] The technical solution adopted by the present application to solve the technical problem is as follows:

[0006] A micro-expansion grouting material resistant to dispersion in a dynamic water environment, comprising A component and B component, wherein:

[0007] The A component is mainly composed of the following raw materials in parts by weight: gel material with the property of volcanic ash 120-160 parts, retarder 3-5 parts, magnesium oxide 10-15 parts, citric acid 0.5-2 parts, aluminum sulfate 5-8 parts, sodium fluoride 1-2 parts, gelatin 0.5-1 part, and water 70-100 parts;

[0008] The B component is mainly composed of the following raw materials in parts by weight: polyacrylamide 4-8 parts, polyacrylic acid derivative salt 5-10 parts, alcohol polysaccharide 1-2 parts, water glass 40-100 parts, and water 30-50 parts;

[0009] The magnesium oxide, aluminum sulfate, gelatin and sodium fluoride in the A component are prepared into core-shell anti-dispersion particles in advance, and the preparation method comprises the following steps: magnesium oxide, sodium fluoride, gelatin and 80% of aluminum sulfate are stirred into a mixture at 35-40℃, the mixture is broken into 2-5mm particles after cooling and solidification, and the particles are coated with a water-soluble polyvinyl alcohol with a thickness of (1±0.2) mm, wherein the water-soluble polyvinyl alcohol has a polymerization degree of ≤1000 and an alcoholysis degree of 70-80%, and the remaining 20% of aluminum sulfate is mixed into the water-soluble polyvinyl alcohol in advance.

[0010] Further, the magnesium oxide is high-activity magnesium oxide prepared by calcination at a low temperature of 600-800℃.

[0011] Further, the aluminum sulfate mixed with the water-soluble polyvinyl alcohol in advance has a particle size of 80-120 mesh.

[0012] Further, the gel material with the property of volcanic ash is compounded from silicate cement, slag, fly ash and basalt fiber according to a weight ratio of (2-3):(2-3):(2-3):(0.5-0.8).

[0013] Further, the retarder is mainly compounded from sodium lignosulfonate and borax according to a weight ratio of (1-3):(1-1.2).

[0014] Further, the polyacrylic acid derivative salt is one of sodium polyacrylate, potassium polyacrylate and zinc polyacrylate.

[0015] Further, the alcohol polysaccharide is one of hydroxypropyl starch, methyl cellulose, curdlan, sodium gluconate and sodium alginate.

[0016] Further, the glass is a medium modulus water glass, and 2.5≤M≤2.8.

[0017] A preparation method of a dynamic water environment anti-dispersion micro-expansion grouting material, comprising the following steps:

[0018] Mix and stir the gel material with the property of volcanic ash, the retarder, citric acid and water in a specified proportion to form slurry A;

[0019] Mix and stir the polyacrylamide, the polyacrylic acid derivative salt, the alcohol polysaccharide and water in a specified weight proportion, then mix and add the water glass in a specified weight proportion while stirring for 5-10min, and continue to stir until uniform to form slurry B;

[0020] Slurry A and slurry B are used for double-liquid grouting, and the core-shell anti-dispersion particles prepared in advance are put into slurry A and stirred for 2-3min before double-liquid grouting operation.

[0021] In the formula of the anti-dispersion micro-expansion grouting material in the dynamic water environment, the A component is a main cement-based gel material, and the B component is a material for promoting the setting of the A component and enhancing the setting strength of the A component by reacting with the A component.

[0022] In order to improve the anti-dispersion and anti-erosion performance of the grouting slurry and improve the retention rate of the grouting material after solidification, the means of accelerating hydration should be used. However, in the underground grouting engineering in the dynamic water environment area, there is generally a certain transportation distance, and the transportation time is about 30-40 minutes, and the underground temperature of the leakage stopping point is basically about 50-60 DEG C. The conventional means of accelerating hydration is prone to cause the slurry to be set before reaching the leakage stopping point. In order to avoid this situation, the application innovatively proposes a cement-based anti-dispersion performance control method of "physical coating hydration particles-chemical complexation of hydration ions-accelerating hydration process", and a "core-shell" anti-dispersion structure design of the cement-based material, and the specific implementation manner is as follows:

[0023] 80% of the raw material aluminum sulfate which can accelerate setting, the composite salt-tolerant expansion component magnesium oxide, and sodium fluoride are bonded into one by a small amount of gelatin to form a core structure, and 20% of the low degree of polymerization and low degree of alcoholysis water-soluble polyvinyl alcohol doped with aluminum sulfate is coated on the surface of the core structure to form a shell structure. In the transportation process, the slurry A can be retarded under the action of the retarder, the melting time of the shell structure of the core-shell anti-dispersion particle is about 30-60 minutes at normal temperature, and with the transportation of the slurry A, the shell layer gradually softens under the action of friction, time and gradually increasing temperature, so that part of the aluminum sulfate in the shell structure is released, and the part of the aluminum sulfate forms a complex with the citric acid in the slurry A, and the complex becomes a hydration inhibition film which can inhibit the early hydration reaction; when the slurry A is mixed with the slurry B and basically reaches the leakage stopping point, under the action of raw material combination friction, temperature rising to 50-60 DEG C, a large amount of aluminum sulfate is released from the shell layer to cause a small amount of magnesium oxide to overflow and react with water to generate magnesium hydroxide and heat, the water-soluble polyvinyl alcohol of the shell layer is completely dissolved, a small amount of gelatin is also completely dissolved, the aluminum sulfate which can accelerate hydration and setting is completely overflowed, and the sodium fluoride is overflowed to break the hydration film inhibition effect of the complex of aluminum sulfate and citric acid, so that the original hydration acceleration effect continues to occur, thereby realizing the rapid thickening and hydration of the slurry, and under the expansion action of the magnesium oxide, the rapid solidification grouting material stone body has an expansion ratio of about 1.04-1.07, which greatly improves the anti-dispersion and anti-erosion performance of the grouting material and improves the retention rate.

[0024] In addition, the gel material with the property of volcanic ash is compounded by silicate cement, slag, fly ash and basalt fiber in a weight ratio of (2-3):(2-3):(2-3):(0.5-0.8), and the compatibility of efficient synergy of multiple solid wastes is achieved from the aspects of physical and mineral phase, so that the mechanical properties of the whole are improved.

[0025] In the application, the magnesium oxide obtained by calcining at 600-800 DEG C is selected, and the magnesium oxide is high-activity magnesium oxide, which reacts rapidly when overflowing from the core structure and releases heat concentratedly, so that the temperature of the core structure is accelerated to melt the shell structure in a short time, and after the reaction is completed, the water-soluble polyvinyl alcohol is dispersed in the material and is easy to form a lump together with other cement-based components at the ambient temperature of the plugging point.

[0026] In the B component, an appropriate amount of water is added to promote the fluidity of the water glass, an appropriate amount of polyacrylamide is added to promote the fluidity and improve the stability of the water glass, and an appropriate amount of polyacrylate derivative salt is added to improve the dispersibility of the water glass, and the appropriate addition of these raw materials promotes the water glass with a modulus of 2.5-2.8 to be stably and smoothly transported to the mixing with the A component in the target environment.

[0027] The application has the following advantages compared with the prior art: the dynamic water environment anti-dispersion micro-expansion grouting material and the preparation method thereof solve the problems of poor anti-washing and anti-dispersion ability, low retention rate and poor durability of traditional cement-based grouting materials, and provide core material support for dynamic water sealing and grouting reinforcement of underground engineering (mine) in a dynamic water environment karst area. DETAILED DESCRIPTION

[0028] Embodiment 1

[0029] The dynamic water environment anti-dispersion micro-expansion grouting material of the embodiment comprises an A component and a B component, wherein:

[0030] The A component is mainly composed of the following raw materials in parts by weight: 142 parts of the gel material with the property of volcanic ash, 4 parts of a retarder, 12 parts of magnesium oxide, 1.3 parts of citric acid, 6 parts of aluminum sulfate, 2 parts of sodium fluoride, 0.8 parts of gelatin, and 88 parts of water;

[0031] The B component is mainly composed of the following raw materials in parts by weight: 6 parts of polyacrylamide, 7 parts of polyacrylic acid derivative salt, 1 part of alcohol polysaccharide, 70 parts of water glass, and 40 parts of water;

[0032] The magnesium oxide, aluminum sulfate, gelatin and sodium fluoride in the A component are prepared into core-shell anti-dispersion particles in advance, and the preparation method comprises the following steps: magnesium oxide, sodium fluoride, gelatin and 80% of aluminum sulfate are stirred into a mixture at 38℃, the mixture is broken into 2-5mm particle after solidification, and the particle is coated with a water-soluble polyvinyl alcohol with a thickness of (1±0.2) mm, wherein the water-soluble polyvinyl alcohol has a polymerization degree of 1000 and an alcoholysis degree of 80%, and the remaining 20% of aluminum sulfate is mixed into the water-soluble polyvinyl alcohol in advance.

[0033] In the embodiment, the magnesium oxide is high-activity magnesium oxide calcined at a low temperature of 800℃. The aluminum sulfate mixed with the water-soluble polyvinyl alcohol in advance has a particle size of 100 mesh. The gel material with the property of volcanic ash is compounded by silicate cement, slag, fly ash and basalt fiber according to a weight ratio of 3:2:2:0.7. The retarder is compounded by sodium lignin sulfonate and borax according to a weight ratio of 2:1.1. The polyacrylic acid derivative salt is potassium polyacrylate. The alcohol polysaccharide is hydroxypropyl starch. The glass is medium modulus water glass, and M=2.6.

[0034] The preparation method of the anti-dispersion micro-expansion grouting material in the flowing water environment of the embodiment comprises the following steps:

[0035] Mix and stir the gel material with the property of volcanic ash, the retarder, citric acid and water in a specified proportion to form slurry A;

[0036] Mix and stir the polyacrylamide, the polyacrylic acid derivative salt, the alcohol polysaccharide and water in a specified weight proportion, and then mix and add the water glass in a specified weight proportion while stirring for 8 minutes, and continue to stir until uniform to form slurry B;

[0037] Slurry A and slurry B are used for double-liquid grouting. Before the double-liquid grouting operation, the pre-prepared core-shell anti-dispersion particles are put into slurry A and stirred for 3 minutes, and then used.

[0038] In the water gushing point of the karst area of the underground engineering in the flowing water environment, the environmental temperature is 50-60℃, the A component and the B component are transported through the double-wall drill pipe of the double-liquid grouting system when the material of the embodiment is used, and the transportation lasts for about 32 minutes to reach the water plugging position. The A component and the B component can be initially set in about 50-80 seconds at the water plugging position. It is detected that the slurry retention rate is greater than 85% under the flowing water flow rate of 1.2m / S; the 28d bending strength of the stone body is greater than 4.4MPa, and the 28d compressive strength is greater than 7.6Mpa; the stone body contains 2% Cl - and SO4 2- The 28d compressive strength of the stone body under the liquid erosion condition is greater than 4.2MPa.

[0039] Embodiment 2

[0040] The dynamic water environment anti-dispersion micro-expansion grouting material of the embodiment comprises A component and B component, wherein:

[0041] The A component is mainly composed of the following raw materials in parts by weight: gel material with volcanic ash characteristics 160 parts, retarder 5 parts, magnesium oxide 15 parts, citric acid 2 parts, aluminum sulfate 8 parts, sodium fluoride 2 parts, gelatin 1 part, and water 100 parts;

[0042] The B component is mainly composed of the following raw materials in parts by weight: polyacrylamide 8 parts, polyacrylic acid derivative salt 10 parts, alcohol polysaccharide 2 parts, water glass 100 parts, and water 50 parts;

[0043] The magnesium oxide, aluminum sulfate, gelatin, and sodium fluoride in the A component are prepared into core-shell anti-dispersion particles in advance, and the preparation method comprises the following steps: magnesium oxide, sodium fluoride, gelatin, and 80% of aluminum sulfate are stirred into a mixture at 40°C, the mixture is broken into 2-5mm particle materials after cooling and solidification, and a water-soluble polyvinyl alcohol with a thickness of (1±0.2)mm is coated on the outside of the particle materials, wherein the water-soluble polyvinyl alcohol has a polymerization degree of 800 and an alcoholysis degree of 70%, and the remaining 20% of aluminum sulfate is dispersed and mixed in the water-soluble polyvinyl alcohol in advance.

[0044] In the embodiment, the magnesium oxide is high-activity magnesium oxide calcined at a low temperature of 700°C. The aluminum sulfate mixed with the water-soluble polyvinyl alcohol in advance is crushed to a particle size of 120 mesh. The gel material with volcanic ash characteristics is compounded from silicate cement, slag, fly ash, and basalt fiber in a weight ratio of 3:3:2:0.8. The retarder is mainly compounded from sodium lignosulfonate and borax in a weight ratio of 3:1.2. The polyacrylic acid derivative salt is zinc polyacrylate. The alcohol polysaccharide is sodium gluconate. The glass is medium modulus water glass with M=2.8.

[0045] The preparation method of the dynamic water environment anti-dispersion micro-expansion grouting material of the embodiment comprises the following steps:

[0046] Mix and stir the specified parts of the gel material with volcanic ash characteristics, the retarder, the citric acid, and the water uniformly to form slurry A;

[0047] Mix and stir the specified parts of the polyacrylamide, the polyacrylic acid derivative salt, the alcohol polysaccharide, and the water, then mix and add the specified parts of the water glass while stirring for 10 minutes, and continue to stir until uniform to form slurry B;

[0048] Slurry A and slurry B are used for double-liquid grouting. Before the double-liquid grouting operation, the core-shell anti-dispersion particles prepared in advance are put into slurry A and stirred for 3 minutes, and then the grouting material can be used.

[0049] In the water environment karst area of the underground project water gushing point, the environmental temperature is 50-60℃, when using the material of the embodiment, the A component and the B component are respectively transported through the double-wall drill pipe of the double-liquid grouting system, and it takes about 35 minutes to reach the water plugging site, and the A component and the B component can be initial set in about 50-70s at the water plugging site. After detection, the slurry retention rate is >80% under the condition of 1.2m / S water flow rate; the 28d bending strength of the stone body is >4.2MPa, and the 28d compressive strength is >7.3Mpa; the 28d compressive strength of the stone body under the liquid erosion condition is >4MPa. - and SO4 2-

[0050] Embodiment 3

[0051] The water environment anti-dispersion micro-expansion grouting material of the embodiment includes an A component and a B component, wherein:

[0052] The A component is mainly composed of the following raw materials in parts by weight: gel material with the property of volcanic ash 120 parts, retarder 3 parts, magnesium oxide 10 parts, citric acid 0.5 parts, aluminum sulfate 5 parts, sodium fluoride 1 part, gelatin 0.5 parts, and water 70 parts;

[0053] The B component is mainly composed of the following raw materials in parts by weight: polyacrylamide 4 parts, polyacrylic acid derivative salt 5 parts, alcohol polysaccharide 1 part, water glass 40 parts, and water 30 parts;

[0054] The magnesium oxide, aluminum sulfate, gelatin and sodium fluoride in the A component are prepared into core-shell anti-dispersion particles in advance, and the preparation method includes the following steps: magnesium oxide, sodium fluoride, gelatin and 80% of aluminum sulfate are stirred into a mixture at 35℃, the mixture is cooled and solidified, and then broken into 2-5mm particle materials, and a water-soluble polyvinyl alcohol with a thickness of (1±0.2)mm is coated on the outside of the particle materials, wherein the water-soluble polyvinyl alcohol has a polymerization degree of 800 and an alcoholysis degree of 70%, and the remaining 20% of aluminum sulfate is dispersed and mixed in the water-soluble polyvinyl alcohol in advance.

[0055] In the embodiment, the magnesium oxide is high-activity magnesium oxide calcined at a low temperature of 600℃. The aluminum sulfate mixed with the water-soluble polyvinyl alcohol in advance is crushed to a particle size of 80 mesh. The gel material with the property of volcanic ash is compounded from silicate cement, slag, fly ash and basalt fiber in a weight ratio of 2:2:3:0.5. The retarder is mainly compounded from sodium lignosulfonate and borax in a weight ratio of 1:1. The polyacrylic acid derivative salt is sodium polyacrylate. The alcohol polysaccharide is sodium alginate. The glass is medium modulus water glass, M=2.5.

[0056] The preparation method of the water environment anti-dispersion micro-expansion grouting material of the embodiment includes the following steps: ​

[0057] Mixing the gel material with the specified proportion of pozzolanic properties, the retarder, citric acid and water to form slurry A;

[0058] Mixing the polyacrylamide, polyacrylic acid derivative salt, alcohol polysaccharide and water in the specified proportion by weight, stirring for 5 minutes, then adding the water glass in the specified proportion by weight while mixing, and continuing to stir until uniform to form slurry B;

[0059] Slurry A and slurry B are used for double-liquid grouting. Before the double-liquid grouting operation, the pre-prepared core-shell anti-dispersion particles are added to slurry A and stirred for 2 minutes, which can be used.

[0060] In the karst area of the dynamic water environment, the environmental temperature is 50-60℃, and the material of the embodiment is used. Through the double-wall drill pipe of the double-liquid grouting system, the A component and the B component are transported to the water plugging site, and it takes about 30 minutes to reach the water plugging site. The A component and the B component can be initial set in about 60-80s at the water plugging site. After detection, the slurry retention rate is >82% under the dynamic water flow rate of 1.2m / S; the 28d bending strength of the stone body is >4MPa, and the 28d compressive strength is >7.2Mpa; the 28d compressive strength of the stone body containing 2% Cl - and SO4 2- The 28d compressive strength of the stone body under liquid erosion conditions is >4MPa.

[0061] Example 4

[0062] The dynamic water environment anti-dispersion micro-expansion grouting material of the embodiment includes A component and B component, wherein:

[0063] The A component is mainly composed of the following raw materials in the specified proportion by weight: gel material with pozzolanic properties 142 parts, retarder 4 parts, magnesium oxide 12 parts, citric acid 1.3 parts, aluminum sulfate 6 parts, sodium fluoride 2 parts, gelatin 0.8 parts, and water 88 parts;

[0064] The B component is mainly composed of the following raw materials in the specified proportion by weight: polyacrylamide 6 parts, polyacrylic acid derivative salt 7 parts, alcohol polysaccharide 1 part, water glass 70 parts, and water 40 parts;

[0065] Among them, the magnesium oxide, aluminum sulfate, citric acid, gelatin and sodium fluoride in the A component are pre-prepared into core-shell anti-dispersion particles, and the preparation method includes the following steps: stirring the magnesium oxide, citric acid, sodium fluoride, gelatin and 80% aluminum sulfate into a mixture at 38℃ environment, crushing the mixture into 2-5mm particle material after the mixture cools and solidifies, coating the particle material with a water-soluble polyvinyl alcohol with a thickness of (1±0.2)mm on the outside, wherein the water-soluble polyvinyl alcohol has a polymerization degree of 1000 and an alcoholysis degree of 80%, and the remaining 20% aluminum sulfate is pre-dispersed and mixed into the water-soluble polyvinyl alcohol.

[0066] In this embodiment, the magnesium oxide is high-activity magnesium oxide prepared by calcination at a low temperature of 800°C. The aluminum sulfate mixed with water-soluble polyvinyl alcohol in advance has a particle size of 100 mesh. The gel material with the property of volcanic ash is compounded from silicate cement, slag, fly ash, and basalt fiber at a weight ratio of 3:2:2:0.7. The retarder is compounded from sodium lignosulfonate and borax at a weight ratio of 2:1.1. The polyacrylic acid derivative salt is potassium polyacrylate. The alcohol polysaccharide is hydroxypropyl starch. The glass is medium modulus water glass, M = 2.6.

[0067] The preparation method of the anti-dispersion micro-expansion grouting material in a flowing water environment in this embodiment includes the following steps:

[0068] Mix and stir the gel material with the property of volcanic ash, the retarder, and water in a specified proportion to form slurry A;

[0069] Mix and stir the polyacrylamide, the polyacrylic acid derivative salt, the alcohol polysaccharide, and water in a specified weight proportion for 8 min, then mix and add the water glass in a specified weight proportion, and continue to stir until uniform to form slurry B;

[0070] The slurry A and the slurry B are used for double-liquid grouting. Before the double-liquid grouting operation, the core-shell anti-dispersion particles prepared in advance are put into the slurry A and stirred for 3 min for use.

[0071] In the karst area of the underground water supply point in a flowing water environment, the environmental temperature is 50-60°C. When the material in this embodiment is used, the A component and the B component are respectively transported through the double-wall drill pipe of the double-liquid grouting system for about 28 min. When the A component is transported to the rear section, the slurry is prematurely solidified, but it does not cause serious blockage. After 5 min of continuous transportation, the A component and the B component are mixed, and serious blockage occurs. The operator immediately stops the grouting operation, closes all the valves and pumping devices, and performs dredging. The cause of the premature blockage is that the citric acid is added to the core-shell anti-dispersion particles, and the 20% aluminum sulfate doped in the shell structure cannot form a complex with the citric acid to play a hydration inhibition role. In addition, the aluminum sulfate has the effect of accelerating hydration, which causes the A component to be prematurely solidified when it is transported to the rear section, resulting in a decrease in the overall flow rate of the A component, and eventually causing serious initial setting when the A component and the B component are mixed.

[0072] The above specific embodiments are only specific cases of the present application, and the patent protection scope of the present application includes but is not limited to the product forms and styles of the above specific embodiments. Any appropriate changes or modifications made by any ordinary skilled person in the art in accordance with the claims of the present application shall fall within the patent protection scope of the present application.

Claims

1. A hydrodynamic environment resistant, dispersion resistant, micro- expanded grout material, characterized in that, It comprises A component and B component; The A component is mainly composed of the following raw materials in parts by weight: gel material with the property of volcanic ash 120-160 parts, retarder 3-5 parts, magnesium oxide 10-15 parts, citric acid 0.5-2 parts, aluminum sulfate 5-8 parts, sodium fluoride 1-2 parts, gelatin 0.5-1 part, and water 70-100 parts; The B component is mainly composed of the following raw materials in parts by weight: polyacrylamide 4-8 parts, polyacrylic acid derivative salt 5-10 parts, alcohol polysaccharide 1-2 parts, water glass 40-100 parts, and water 30-50 parts; The magnesium oxide, aluminum sulfate, gelatin and sodium fluoride in the A component are prepared into core-shell anti-dispersion particles in advance, and the preparation method comprises the following steps: stirring the magnesium oxide, sodium fluoride, gelatin and 80% of the aluminum sulfate into a mixture at 35-40℃, crushing the mixture into 2-5mm particles after it is cooled and solidified, coating the particles with a water-soluble polyvinyl alcohol with a thickness of (1±0.2)mm, wherein the water-soluble polyvinyl alcohol has a polymerization degree of ≤1000 and an alcoholysis degree of 70-80%, and the remaining 20% of the aluminum sulfate is mixed into the water-soluble polyvinyl alcohol in advance; The gel material with the property of volcanic ash is a compound of silicate cement, slag, fly ash and basalt fiber in a weight ratio of (2-3):(2-3):(2-3):(0.5-0.8). The alcohol polysaccharide is one of hydroxypropyl starch, methyl cellulose, curdlan and sodium alginate.

2. The micro-expansion grouting material of claim 1, wherein the micro-expansion grouting material is resistant to dispersion in a flowing water environment. The magnesium oxide is high-activity magnesium oxide calcined at a low temperature of 600-800℃.

3. The micro-expansion grouting material of claim 1, wherein the micro-expansion grouting material is resistant to dispersion in a flowing water environment. The aluminum sulfate mixed with the water-soluble polyvinyl alcohol in advance is crushed to a particle size of 80-120 mesh.

4. The micro-expansion grouting material of claim 1, wherein the micro-expansion grouting material is resistant to dispersion in a flowing water environment. The retarder is mainly composed of sodium lignosulfonate and borax in a weight ratio of (1-3):(1-1.2).

5. The micro-expansion grouting material of claim 1, wherein the micro-expansion grouting material is resistant to dispersion in a flowing water environment. The polyacrylic acid derivative salt is one of sodium polyacrylate, potassium polyacrylate and zinc polyacrylate.

6. The micro-expansion grouting material of claim 1, wherein the micro-expansion grouting material is resistant to dispersion in a flowing water environment. The glass is a medium modulus water glass with 2.5≤M≤2.

8.

7. The method according to any one of claims 1 to 6, wherein the method is characterized in that, It comprises the following steps: Mixing and stirring the gel material with the property of volcanic ash, the retarder, citric acid and water in a specified amount to form slurry A; Mixing and stirring polyacrylamide, polyacrylic acid derivative salt, alcohol polysaccharide and water in a specified amount, then adding water glass in a specified amount while mixing, and continuing to stir until uniform to form slurry B; The core-shell anti-dispersion particles prepared in advance are put into slurry A and stirred for 2-3min before the double-liquid grouting operation, and then the grouting can be performed.