Composition for wet-grinded cement-based nanocomposite grouting material, wet-grinded cement-based nanocomposite grouting material, preparation method and application thereof

Abstract

The invention discloses a composition for wet-grinding cement-based nanocomposite grouting material, a wet-grinding cement-based nanocomposite grouting material and a preparation method and application thereof, and belongs to the technical field of underground engineering grouting reinforcement and anti-seepage grouting material. The composition provided by the invention comprises the following components by mass: 100 parts of cement; 0.5 to 3 parts of calcium oxide powder; 1 to 6 parts of dispersant; 1 to 3 parts of silica sol; 0.5 to 2 parts of polydimethylsiloxane; 0.1 to 0.5 parts of 2-aminobenzoic acid butyl ester. The wet-grinding cement-based nanocomposite grouting material prepared by the above-mentioned composition in combination with a wet-grinding process has the characteristics of small slurry particle size, high pourability, strong anti-dispersion and anti-seepage performance in a water-rich environment, adjustable gelling time, high stability and low cost.

Description

Technical Field

[0001] The invention relates to a composition for wet-ground cement-based nano-composite grouting materials, a wet-ground cement-based nano-composite grouting material, a preparation method and application thereof, and belongs to the technical field of underground engineering grouting reinforcement and anti-seepage grouting materials. Background Art

[0002] In recent years, with the continuous advancement of urbanization, underground space projects have become increasingly more numerous. When underground engineering construction involves strata in water-rich granite alteration zones, due to the special mechanical properties of the weak strata, large deformation, landslides, sudden surges and other engineering disasters are prone to occur, and grouting technology is required to reinforce the strata. However, the strata in the water-rich granite alteration zone are severely muddy and sandy, with a high content of fine clay. Under the action of ground stress, the relative density is high and difficult to penetrate. When traditional cement slurries are grouted in such strata, due to their large suspended particle size, they show low pourability and are difficult to achieve the reinforcement effect required by the design. In addition, chemical grouting is expensive and not environmentally friendly and is not suitable for grouting construction in such strata. In view of this, there is an urgent need to develop a green, cheap new grouting material with high stability, which can be injected into small cracks, has high fluidity and low viscosity during the pumping and flow periods, and has strong and fast effect after the diffusion is completed. This material can effectively diffuse into the water-rich granite alteration zone strata to achieve a good grouting reinforcement effect, meet the needs of underground space engineering construction, and at the same time reduce engineering costs and reduce environmental impact. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, one of the purposes of the present invention is to provide a composition for wet-ground cement-based nanocomposite grouting materials. The wet-ground cement-based nanocomposite grouting materials prepared by the composition have the characteristics of small slurry particle size, high pourability, strong anti-dispersion and anti-seepage performance in a water-rich environment, adjustable gelling time, high stability and low cost. In addition, the main component of the slurry preparation is still ordinary cement material (Portland cement), the construction cost is low, and the principle of reducing cost and increasing efficiency is followed.

[0004] The second purpose of the present invention is to provide a method for preparing wet-ground cement-based nanocomposite grouting materials. The method has a simple preparation process and low cost. The wet grinding treatment is carried out with cement slurry, which reduces the size of suspended particles in the slurry and makes the slurry distribution more uniform and the overall stability is improved.

[0005] The third object of the present invention is to provide a wet-ground cement-based nanocomposite grouting material, which has the characteristics of small slurry particle size, high pourability, strong anti-dispersion and anti-seepage performance in a water-rich environment, adjustable gel time, high stability and low cost.

[0006] The fourth object of the present invention is to provide a wet-ground cement-based nanocomposite grouting material for use in water-rich granite altered zone strata. The material has a good grouting reinforcement effect in water-rich granite altered zone strata.

[0007] In order to achieve the above object, the first aspect of the present invention is to provide a wet-grinded cement-based nanocomposite grouting material composition, comprising the following components by weight:

[0008] 100 parts of cement;

[0009] 0.5~3 parts of calcium oxide powder;

[0010] Dispersant 1~6 parts;

[0011] 1~3 parts of silica sol;

[0012] 0.5-2 parts of polydimethylsiloxane;

[0013] 0.1~0.5 parts of butyl 2-aminobenzoate.

[0014] The invention adopts a composition comprising cement, calcium oxide powder, dispersant, silica sol, polydimethylsiloxane and 2-butyl aminobenzoate as a wet-grinded cement-based nanocomposite grouting material, wherein cement is used as a main cementitious solidifying material to perform grouting reinforcement on the stratum; the addition of nano-silica sol can fill the pores between cement particles in the hydration reaction of cement slurry to improve the strength; and the silica sol can also fill the smaller pores in the stratum to improve the integrity of the reinforcement body; the addition of calcium oxide can increase the Ca(OH) in the cement hydration reaction product. 2 content, prolonging the setting time, making the hydration reaction more complete and improving the density of the consolidated body; the addition of dispersant makes the cement suspended particles dispersed evenly, improving the wet grinding efficiency and improving the rheological properties of the cement slurry to give it better pumping performance; the addition of dimethylsiloxane and 2-aminobenzoic acid butyl ester has little effect on the cement hydration reaction, and as a solution-type cementitious material, it is easy to enter tiny gaps to fill and solidify. It can enter the tiny pores in the formation that the cement suspended particles cannot enter, and cooperate with the cement slurry to coagulate to achieve a good reinforcement and anti-seepage effect, thereby improving the anti-seepage effect of the consolidated body.

[0015] The synergistic effect of various substances in the present invention can make the prepared wet-ground cement-based nanocomposite grouting material have the characteristics of small slurry particle size, high pourability, strong anti-dispersion and anti-seepage performance in a water-rich environment, adjustable gel time, high stability and low cost.

[0016] As a more preferred solution, the composition comprises the following components by mass: 100 parts of cement; 0.5-2 parts of calcium oxide powder; 1-4 parts of dispersant; 1-3 parts of silica sol; 0.5-1.5 parts of polydimethylsiloxane; 0.1-0.3 parts of 2-aminobenzoic acid butyl ester. The appropriate amount of calcium oxide can improve the density of the cement consolidation body and prevent cracking. If too much is added, the slurry will coagulate rapidly and cannot meet the operation time required for grouting construction. The appropriate amount of dispersant can improve the fluidity of the slurry and improve the wet grinding efficiency. If excessively added, it will delay the coagulation of the cement slurry and reduce the initial strength of the consolidation body. The appropriate amount of nano-silica sol can enhance the connection between the hydration reactants and enhance the overall strength. The nano-silica sol can also penetrate into small cracks to improve the consolidation effect. Excessive addition will cause the cement and nano-silica sol to gel immediately. However, excessive addition of polydimethylsiloxane and 2-aminobenzoic acid butyl ester will change the microstructure of cement stone, resulting in the appearance of many tiny cavities and reducing the initial setting strength of the stone.

[0017] As a more preferred solution, the composition comprises the following components by mass: 100 parts of cement; 2 parts of calcium oxide powder; 4 parts of dispersant; 1 part of silica sol; 0.5 parts of polydimethylsiloxane; and 0.1 parts of butyl 2-aminobenzoate.

[0018] As a preferred solution, the composition further contains water.

[0019] As a further preferred embodiment, the composition is composed of the following components by mass: 100 parts of cement; 0.5-3 parts of calcium oxide powder; 1-6 parts of dispersant; 1-3 parts of silica sol; 0.5-2 parts of polydimethylsiloxane; 0.1-0.5 parts of butyl 2-aminobenzoate; and 120-160 parts of water.

[0020] As a preferred solution, the silica sol is alkaline nano silica sol.

[0021] As a preferred solution, the dispersant is sodium polyacrylate, which can prevent cement slurry from sedimentation and improve wet grinding efficiency and flowability.

[0022] As a preferred solution, the cement is silicate cement. The use of silicate cement has low construction cost and follows the principle of reducing cost and increasing efficiency.

[0023] As a more preferred solution, the cement is p42.5 silicate cement with a fineness of ≤10.0 mm.

[0024] As a preferred solution, the viscosity of the polydimethylsiloxane is 50-200 CST.

[0025] As a more preferred solution, the viscosity of the polydimethylsiloxane is 50 CST.

[0026] As a preferred solution, the silica content in the silica sol is 25-30wt%, and the pH value is 9-10. The microstructure of cement hydration products can be improved, the strength of the consolidated body is high, and the silica sol, as a nano-scale material, can enter and fill smaller pores in the formation, and the consolidation and anti-seepage effect is better.

[0027] As a preferred solution, the number average molecular weight of the sodium polyacrylate is 800-1200, and the effective content is >90wt%.

[0028] As a preferred solution, the particle size of the calcium oxide powder is 50-150 μm, and the relative density is 3.25-3.38.

[0029] The present invention also provides a method for preparing a wet-ground cement-based nanocomposite grouting material, which is carried out using the components in any one of the compositions described in the first aspect, comprising:

[0030] (1) In the presence of water, cement, calcium oxide powder, dispersant, and silica sol are stirred and mixed to prepare a cement-based slurry, and then wet-milled to prepare a wet-milled cement-based nano-slurry;

[0031] (2) stirring and mixing the polydimethylsiloxane and the wet-ground cement-based nano-slurry II to obtain a wet-ground cement-based nano-slurry containing polydimethylsiloxane;

[0032] (3) Stirring and mixing butyl 2-aminobenzoate and wet-ground cement-based nano-slurry containing polydimethylsiloxane III to obtain a wet-ground cement-based nano-composite grouting material.

[0033] The present invention creatively wet-grinds the cement-based slurry after adding silica sol. This process can not only effectively improve the particle size characteristics of cement suspension particles, so that it can reach the grouting ratio required for grouting construction (the ratio of formation pore size D to slurry particle size r), but also eliminate the agglomerates formed by cement particles adsorbed after the electrostatic balance mechanism of silica sol is destroyed. In addition, after wet grinding, the specific surface area of ​​cement increases and is evenly distributed, the segregation and precipitation are small, the slurry is stable, and the grouting performance of the slurry is improved.

[0034] As a preferred solution, the mass ratio of the cement to the water is 100:120-160. If the amount of water is too little, the fluidity requirement of the wet grinding process cannot be met, and if the amount of water is too much, the slurry will be severely segregated and the strength of the consolidated body will be greatly reduced.

[0035] As a preferred solution, the stirring and mixing conditions I are: a rotation speed of 800-1200 rpm and a time of 5-15 min.

[0036] As a preferred solution, the wet grinding treatment conditions are: the grinding chamber rotation speed is 2500-3500 rpm, and the time is 10-30 min.

[0037] As a preferred solution, the stirring and mixing conditions II and III are independently 800-1200 rpm and the time is 3-5 min.

[0038] The present invention also provides a wet-ground cement-based nano-composite grouting material prepared by the above-mentioned method for preparing a wet-ground cement-based nano-composite grouting material. The material has the characteristics of small slurry particle size, high pourability, strong anti-dispersion and anti-seepage performance in a water-rich environment, adjustable gel time, high stability and low cost.

[0039] The present invention also provides the use of wet-ground cement-based nanocomposite grouting materials in water-rich granite altered zone strata. The wet-ground cement-based nanocomposite grouting materials provided by the present invention can not only be used for grouting and anti-seepage reinforcement of water-rich granite altered zone strata, but can also be used for grouting construction of other strata with relatively dense and low groutability.

[0040] Compared with the prior art, the present invention has at least the following advantages:

[0041] The wet-ground cement-based nanocomposite grouting material provided by the present invention has the performance characteristics of small particle size, high pourability, strong anti-dispersion and anti-seepage performance in a water-rich environment, adjustable gel time, stability, etc. It has a good grouting reinforcement effect in water-rich granite alteration zone strata, and the main component of the slurry preparation is still ordinary Portland cement material, the construction cost is low, and the principle of reducing cost and increasing efficiency is followed. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is an appearance diagram of the grouting material prepared in Example 1 of the present invention.

[0043] Figure 2 This is a diagram showing the grouting material prepared in Example 1 of the present invention is injected into the alteration zone, and the grouting reinforcement effect of the cross section below the tunnel face after excavation. DETAILED DESCRIPTION

[0044] The range endpoints and any values ​​shown in this article are not limited to the precise range or value, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0045] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited to the following specific embodiments. Obviously, the embodiments described below are only a part of the embodiments, and all other embodiments obtained by professionals in this field without creative work still belong to the protection scope of the present invention.

[0046] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0047] In the following examples, cement is p42.5 silicate cement, cement fineness ≤10.0mm; calcium oxide powder particle size is 75μm, relative density is 3.25; dispersant is sodium polyacrylate, number average molecular weight is 1000, effective content>90wt%; silica sol is alkaline nano silica sol, silicon dioxide content is 30wt%, pH value is 9.4; polydimethylsiloxane viscosity is 50CST.

[0048] Each portion in the following examples represents 100 g.

[0049] Example 1

[0050] (1) 100 parts of cement, 2 parts of calcium oxide powder, 4 parts of dispersant, 1 part of silica sol and 120 parts of water were placed in a mixing barrel and stirred evenly (speed 1000 rpm, time 10 min) to obtain a cement-based slurry, and then the cement-based slurry was poured into a wet mill barrel and wet-milled at a speed of 3000 rpm for 15 min to obtain a wet-milled cement-based nano-slurry;

[0051] (2) adding 0.5 parts of polydimethylsiloxane to the wet-ground cement-based nano-slurry, stirring at a rotation speed of 1000 rpm for 3 minutes, to obtain a wet-ground cement-based nano-slurry containing polydimethylsiloxane;

[0052] (3) Slowly add 0.1 parts of butyl 2-aminobenzoate into the wet-ground cement-based nano-slurry containing polydimethylsiloxane, and stir at a rotation speed of 1000 rpm for 3 minutes to obtain a wet-ground cement-based nano-composite grouting material.

[0053] Figure 1 This is the appearance of the grouting material prepared in Example 1 of the present invention. Figure 1 It can be seen that the wet-ground cement-based nanocomposite slurry is a gray-black suspended fluid with a fine and smooth surface and is overall uniform and stable.

[0054] The slurry particles prepared in step (1) have an intermediate particle size D50 < 5 μm, and the slurry particle size range is less than 10 μm.

[0055] Example 2

[0056] (1) 100 parts of cement, 1 part of calcium oxide powder, 2 parts of dispersant, 1 part of silica sol and 140 parts of water were placed in a mixing barrel and stirred evenly (speed 1200 rpm, time 5 min) to obtain a cement-based slurry, and then the cement-based slurry was poured into a wet mill barrel and wet-milled at a speed of 3500 rpm for 10 min to obtain a wet-milled cement-based nano-slurry;

[0057] (2) adding 0.5 parts of polydimethylsiloxane to the wet-ground cement-based nano-slurry, stirring at a rotation speed of 1200 rpm for 3 minutes, to obtain a wet-ground cement-based nano-slurry containing polydimethylsiloxane;

[0058] (3) Slowly add 0.2 parts of butyl 2-aminobenzoate into the wet-ground cement-based nano-slurry containing polydimethylsiloxane, and stir at a rotation speed of 1000 rpm for 3 minutes to obtain a wet-ground cement-based nano-composite grouting material.

[0059] The median particle size D50 of the slurry prepared in step (1) is less than 4.5 μm, and the particle size range of the slurry is less than 28 μm.

[0060] Example 3

[0061] (1) 100 parts of cement, 1.5 parts of calcium oxide powder, 3 parts of dispersant, 2 parts of silica sol and 140 parts of water were placed in a mixing barrel and stirred evenly (speed 1000 rpm, time 10 min) to obtain a cement-based slurry, and then the cement-based slurry was poured into a wet mill barrel and wet-milled at a speed of 3000 rpm for 15 min to obtain a wet-milled cement-based nano-slurry;

[0062] (2) adding 1 part of polydimethylsiloxane to the wet-ground cement-based nano-slurry, stirring at a rotation speed of 1000 rpm for 3 minutes, to obtain a wet-ground cement-based nano-slurry containing polydimethylsiloxane;

[0063] (3) Slowly add 0.3 parts of butyl 2-aminobenzoate into the wet-ground cement-based nano-slurry containing polydimethylsiloxane, and stir at a rotation speed of 1000 rpm for 3 minutes to obtain a wet-ground cement-based nano-composite grouting material.

[0064] The median particle size D50 of the slurry prepared in step (1) is less than 5 μm, and the slurry particle size range is less than 15 μm.

[0065] Example 4

[0066] (1) 100 parts of cement, 0.5 parts of calcium oxide powder, 1 part of dispersant, 3 parts of silica sol and 160 parts of water were placed in a mixing barrel and stirred evenly (speed 1000 rpm, time 10 min) to obtain a cement-based slurry, and then the cement-based slurry was poured into a wet mill barrel and wet-milled at a speed of 3000 rpm for 15 min to obtain a wet-milled cement-based nano-slurry;

[0067] (2) adding 1.5 parts of polydimethylsiloxane to the wet-ground cement-based nano-slurry, stirring at a rotation speed of 1000 rpm for 3 minutes, to obtain a wet-ground cement-based nano-slurry containing polydimethylsiloxane;

[0068] (3) Slowly add 0.3 parts of butyl 2-aminobenzoate into the wet-ground cement-based nano-slurry containing polydimethylsiloxane, and stir at a rotation speed of 1000 rpm for 3 minutes to obtain a wet-ground cement-based nano-composite grouting material.

[0069] The median particle size D50 of the slurry prepared in step (1) is less than 5.5 μm, and the particle size range of the slurry is less than 22 μm.

[0070] Comparative Example 1

[0071] This comparative example was carried out in a similar manner to Example 1, except that the amount of polydimethylsiloxane was adjusted to 2.2 parts to prepare a wet-ground cement-based nanocomposite grouting material.

[0072] Comparative Example 2

[0073] This comparative example was carried out in a similar manner to Example 1, except that the amount of butyl 2-aminobenzoate was adjusted to 0.7 parts to prepare a wet-ground cement-based nanocomposite grouting material.

[0074] Test Case

[0075] The wet-ground cement-based nanocomposite grouting material prepared in the above example was tested for fluidity, viscosity, stone rate, initial setting time, injection filtration rate, and 28d unconfined compressive strength of the stone body. The specific test standards and test results are shown in Table 1.

[0076] Table 1

[0077]

[0078] From the experimental results in Table 1, the various indicators obtained in Examples 1 to 4 of the present invention can meet the requirements for reinforcement of strata in water-rich granite alteration zones, specifically: the cement slurry circular mold measured the slurry fluidity to be between 34.2 and 40.4 mm, with good fluidity and good pourability. If the fluidity is too high, the grouting material is prone to excessive flow and cannot effectively fill the target position, such as flowing out of the cracks; if the fluidity is too low, the material is viscous and difficult to flow, and it is difficult to penetrate into the gaps and pores, and cannot be well filled and reinforced, which will affect the grouting effect. The slurry stone rate is concentrated in 98.3~99.5%, indicating that the filling effect is good, it can effectively fill pores or cracks, and it means that the integrity is good after consolidation and it has a certain anti-seepage effect. The initial setting time is concentrated in 101~140min, which means that there is enough time to ensure that it is poured everywhere, and it can solidify in time after the pouring is completed to play a reinforcement role. The 100M injection filtration rate of the slurry is mainly concentrated in 91.68~96.41%, indicating that the material particles are fine and uniform, can pass through the grouting channel and pores smoothly, are not easy to be blocked, and have good permeability. The 28d unconfined compressive strength of the stone body is concentrated in 2.24~4.16MPa, indicating that the slurry has a certain strength after consolidation and can withstand a certain load. And among Examples 1~4 of the present invention, the various indicators of Example 1 are the best.

[0079] The slurry prepared in Comparative Example 1 of the present invention has an unconfined compressive strength of 1.45 MPa at 28 days. Compared with Example 1, due to excessive addition of polydimethylsiloxane, a porous structure is formed in the stone body, and the strength drops sharply, making it difficult to meet the strength requirements of the grouting reinforcement design.

[0080] The slurry prepared in Comparative Example 2 of the present invention has an initial setting time of 246 min, a stone rate of 89.0%, and a strength that is sharply reduced to only 0.87 MPa due to excessive addition of 2-aminobenzoic acid butyl ester. The water-rich granite stratum is difficult to fully fill, and the consolidation strength is low, making it difficult to meet the design requirements of grouting reinforcement.

[0081] Application Examples

[0082] The surrounding rock of a tunnel is a water-rich granite alteration zone stratum with a permeability coefficient of 8.18×10 -5 cm / s, porosity is 33.1%, and mud content is 27.83%. Due to the large differences in mineral composition and structure between altered rock and original rock, the density, strength, and deformation modulus are often low, and the rock mass is relatively broken. The stratum is affected by excavation disturbance and scouring and transportation by groundwater flow, and the cohesion and stability are reduced. Groundwater carries a large amount of mud and sand into the tunnel from the damaged area, causing landslides or water and mud bursts, which requires grouting reinforcement.

[0083] Grouting was performed using the grouting materials and mix ratios in Example 1 of the present invention, and grouting was performed in multiple grouting holes on the excavated face. The rock mass of the face after grouting reinforcement was analyzed. After grouting reinforcement, the face surface was dry and had good consolidation integrity. The slurry was evenly diffused and densely filled in the muddy geology, meeting the design requirements of grouting reinforcement.

[0084] Figure 2 This is a diagram showing the grouting reinforcement effect of the cross section below the tunnel face after excavation after the grouting material prepared in Example 1 of the present invention is injected into the altered zone. Figure 2 It can be seen that the wet-ground cement-based nanocomposite grouting material diffuses evenly in the stratum, forming slurry veins with good ductility, and the stratum is dense and has high integrity after reinforcement.

[0085] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A wet-grinded cement-based nanocomposite grouting material composition, characterized in that: Contains the following components by mass: 100 parts of cement; 0.5~3 parts of calcium oxide powder; Dispersant 1~6 parts; 1~3 parts of silica sol; 0.5-2 parts of polydimethylsiloxane; 0.1~0.5 parts of butyl 2-aminobenzoate.

2. A wet-grinded cement-based nanocomposite grouting material composition according to claim 1, characterized in that: The silica sol is alkaline nano silica sol; And / or, the dispersant is sodium polyacrylate; And / or, the cement is Portland cement; And / or, the viscosity of the polydimethylsiloxane is 50-200 CST.

3. A wet-grinded cement-based nanocomposite grouting material composition according to claim 2, characterized in that: The silica sol has a silicon dioxide content of 25-30 wt % and a pH value of 9-10.

4. A wet-grinded cement-based nanocomposite grouting material composition according to claim 2, characterized in that: The number average molecular weight of the sodium polyacrylate is 800-1200, and the effective content is >90wt%.

5. A wet-grinded cement-based nanocomposite grouting material composition according to any one of claims 1 to 4, characterized in that: The particle size of the calcium oxide powder is 50-150 μm, and the relative density is 3.25-3.

38.

6. A method for preparing a wet-ground cement-based nanocomposite grouting material, characterized in that: The method is carried out using the components in the composition according to any one of claims 1 to 5, comprising: (1) In the presence of water, cement, calcium oxide powder, dispersant, and silica sol are stirred and mixed to prepare a cement-based slurry, and then wet-milled to prepare a wet-milled cement-based nano-slurry; (2) stirring and mixing the polydimethylsiloxane and the wet-ground cement-based nano-slurry II to obtain a wet-ground cement-based nano-slurry containing polydimethylsiloxane; (3) Stirring and mixing butyl 2-aminobenzoate and wet-ground cement-based nano-slurry containing polydimethylsiloxane III to obtain a wet-ground cement-based nano-composite grouting material.

7. A method for preparing a wet-ground cement-based nanocomposite grouting material according to claim 6, characterized in that: The mass ratio of the cement to the water is 100:120-160.

8. A method for preparing a wet-ground cement-based nanocomposite grouting material according to claim 6 or 7, characterized in that: The stirring and mixing conditions are as follows: a rotation speed of 800-1200 rpm and a time of 5-15 min; And / or, the wet grinding treatment conditions are: the grinding chamber speed is 2500-3500 rpm, and the time is 10-30 min; And / or, the stirring and mixing conditions II and III are independently 800-1200 rpm and the time is 3-5 min.

9. A wet-ground cement-based nanocomposite grouting material prepared by the method for preparing a wet-ground cement-based nanocomposite grouting material according to any one of claims 6 to 8.

10. Use of the wet-ground cement-based nanocomposite grouting material as claimed in claim 9 in water-rich granite alteration zone strata.

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