Grouting reinforcement material and preparation method and application thereof

Abstract

The invention discloses a grouting reinforcement material as well as a preparation method and application thereof, and relates to the technical field of mine grouting reinforcement materials. The grouting reinforcement material comprises the following components in percentage by mass: 85%-97% of an inorganic material and 3%-15% of an organic material, wherein the total mass fraction of the grouting reinforcement material is 100%; the organic materials comprise a water reducing agent, a suspending agent, a defoaming agent, a waterproof agent, an air entraining agent, an adhesive and water-absorbent resin; the inorganic material comprises a hydraulic cementing material, an expanding agent, an early strength agent and a rheological agent. When the grouting reinforcement material is used for reinforcing the soft rock roadway, the crack resistance, the water-proof and seepage-proof performance and the self-repairing performance of the grouting reinforcement material are good.

Description

Technical Field

[0001] The invention relates to the technical field of mine grouting reinforcement materials, and in particular to a grouting reinforcement material and a preparation method and application thereof. Background Art

[0002] The surrounding rock of the water-absorbing soft rock tunnel contains a large amount of mud clay minerals such as kaolinite, montmorillonite, and illite, which results in low rock strength, strong water absorption and expansion, and a large softening coefficient. The common resin anchor has poor adhesion to the mudstone interface, which leads to debonding and slippage of the resin anchoring section, making support difficult. Grouting reinforcement and high-strength anchor support technology is an efficient support method for soft rock tunnels. The performance of the grouting material has a significant impact on the effect of grouting reinforcement and high-strength anchor support.

[0003] The grouting materials currently used in mines are not suitable for soft rock tunnels and need further improvement and optimization. Patent CN113548866B discloses a mud-affinity grouting reinforcement material and grouting process, which solves the problem of large water separation and poor adhesion of inorganic grouting materials, but lacks further in-depth research on the water-proof and anti-seepage properties, crack resistance, and self-repairing properties of grouting materials used in water-absorbing soft rock tunnels. Summary of the invention

[0004] The main purpose of the present invention is to provide a grouting reinforcement material and a preparation method and application thereof, so as to solve the problems of poor crack resistance, water-proof and anti-seepage properties, and self-repairing properties of grouting materials for water-absorbing soft rock tunnels.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present invention, a grouting reinforcement material is provided, which includes the following components in mass fractions, taking the total mass fraction of the grouting reinforcement material as 100%: 85% to 97% of inorganic materials and 3% to 15% of organic materials; the organic materials include water reducing agents, suspending agents, defoaming agents, waterproofing agents, air entraining agents, adhesives and water-absorbing resins; the inorganic materials include hydraulic cementitious materials, expansion agents, early strength agents and rheological agents.

[0006] The present invention can overcome the problems of poor injectability of inorganic materials, shrinkage of the consolidation body, insufficient bonding, etc. by using inorganic materials and organic materials in combination. In addition, the present invention can further improve the crack resistance and water-proof and anti-seepage properties of the stone body by selecting a defoamer, a waterproofing agent, an air entraining agent and a water-absorbing resin in combination, and improve the grouting reinforcement and anchoring support effects of soft rock tunnels.

[0007] Furthermore, taking the total mass fraction of the grouting reinforcement material as 100%, the mass fraction of the water reducing agent is 0.1% to 2%, the mass fraction of the suspending agent is 0.02% to 0.1%, the mass fraction of the defoaming agent is 0.01% to 0.5%, the mass fraction of the waterproofing agent is 0.1% to 0.2%, the mass fraction of the air entraining agent is 0.01% to 0.05%, the mass fraction of the adhesive is 0.5% to 10%, and the mass fraction of the water-absorbing resin is 2% to 5%.

[0008] Furthermore, taking the total mass fraction of the grouting reinforcement material as 100%, the mass fraction of the water reducing agent is 0.1% to 0.4%, the mass fraction of the suspending agent is 0.03% to 0.05%, the mass fraction of the defoaming agent is 0.1% to 0.2%, the mass fraction of the waterproofing agent is 0.1% to 0.15%, the mass fraction of the air entraining agent is 0.02% to 0.03%, the mass fraction of the adhesive is 1% to 1.5%, and the mass fraction of the water-absorbing resin is 2% to 3%.

[0009] Water reducer can reduce the distance between cement particles and increase the contact area between cement and water, thereby improving the hydration rate and strength of cement. At the same time, water reducer can also improve the fluidity of grouting materials, help grouting materials fill cracks and gaps during construction, and improve the injectability of inorganic slurry; suspending agent can improve the stability of slurry, improve grouting effect, and extend the shelf life of slurry; defoamer can also help improve the fluidity of grouting materials and improve the consolidation density of slurry. By selecting the above three materials and controlling their dosage, the slurry can have good stability and processing performance. In addition, by controlling the dosage of defoamer, waterproofing agent, and air entraining agent, the amount of microbubbles can be increased, the internal microstructure of the stone body can be changed, and its crack resistance and water-proof and impermeability can be improved; adhesives are mainly used to improve the adhesion between grouting reinforcement materials and soft rock tunnels and improve the bonding strength; adding a certain amount of water-absorbing resin can reduce the impact of water on soft rock tunnels and improve the self-repairing performance of the stone body.

[0010] Furthermore, the water reducer is at least one of a naphthalene-based water reducer, a melamine water reducer, and a polycarboxylic acid water reducer.

[0011] Furthermore, the suspending agent is at least one of hydroxypropyl cellulose, hydroxypropyl methyl cellulose ether and carboxymethyl cellulose.

[0012] Furthermore, the defoaming agent is a silicone defoaming agent.

[0013] Furthermore, the waterproofing agent is at least one of a silicone waterproofing agent and a stearic acid metal soap waterproofing agent.

[0014] Furthermore, the air entraining agent is at least one of a rosin soap-based air entraining agent and a sodium sulfonate-based air entraining agent.

[0015] Furthermore, the adhesive is at least one of polyacrylate latex powder, VAE latex powder and rubber latex powder.

[0016] Furthermore, taking the total mass fraction of the grouting reinforcement material as 100%, the mass fraction of the hydraulic cementitious material is 70% to 90%, the mass fraction of the expansion agent is 5% to 10%, the mass fraction of the early strength agent is 0.1% to 2%, and the mass fraction of the rheological agent is 0.1% to 10%.

[0017] Furthermore, the hydraulic cementitious material is at least one of silicate cement, sulphoaluminate cement, aluminate cement and ferroaluminate cement.

[0018] Furthermore, the expansion agent is at least one of anhydrous gypsum, U-type expansion agent, CEA expansion agent, and alunite expansion agent.

[0019] Furthermore, the early strength agent is at least one of sodium sulfate, lithium salt, potassium sulfate, nitrate and nitrite.

[0020] Furthermore, the rheological agent is at least one of silica fume, fly ash and slag powder.

[0021] According to a second aspect of the present invention, there is provided a method for preparing the grouting reinforcement material according to the first aspect of the present invention, comprising the following steps:

[0022] S1, mixing, stirring, and ball-milling a hydraulic cementitious material, an expansion agent, an early strength agent, and a rheological agent to obtain a mixed material;

[0023] S2, mixing the mixed material with a water reducing agent, a suspending agent, a defoaming agent, a waterproofing agent, an air entraining agent, a binder and a water absorbing resin, and stirring to obtain the grouting reinforcement material.

[0024] Furthermore, in S1, the particle size of the mixed material is 1000-2000 mesh.

[0025] Furthermore, in S1, the stirring time is 5 to 15 minutes; in S2, the stirring time is 5 to 15 minutes.

[0026] According to a third aspect of the present invention, there is provided a grouting reinforcement material according to the first aspect of the present invention or a grouting reinforcement material prepared by the preparation method of the second aspect of the present invention for use in grouting reinforcement in water-absorbing soft rock tunnels.

[0027] The grouting reinforcement material provided by the present invention includes organic materials and inorganic materials. By limiting the amount of the two materials, the cost can be balanced, the performance of the inorganic materials and the effect of grouting reinforcement can be improved. In addition, the present invention can change the internal microstructure of the stone body by using a defoaming agent, a waterproofing agent and an air entraining agent, improve the crack resistance and water-proof and impermeability of the stone body, and in addition, the present invention can reduce the weakening of mud soft rock by water by introducing a water-absorbing resin, increase the micro-deformation self-repairing performance of the stone body, and further improve the grouting reinforcement and anchoring support effect of the soft rock tunnel. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0029] As described in the background of the present invention, the prior art has problems such as poor water-proof and anti-seepage properties, crack resistance, and self-repairing properties of grouting materials used in water-absorbing soft rock tunnels. In order to solve the above technical problems, in a typical embodiment of the present invention, a grouting reinforcement material is provided, which includes the following components by mass fraction, taking the total mass fraction of the grouting reinforcement material as 100%: 85% to 97% of inorganic materials and 3% to 15% of organic materials; organic materials include water reducers, suspending agents, defoamers, waterproofing agents, air entraining agents, adhesives, and water-absorbing resins; inorganic materials include hydraulic cementitious materials, expansion agents, early strength agents, and rheological agents.

[0030] By adding a water reducing agent, the ratio of water to cement in the grouting material can be reduced, thereby improving the strength and durability of the material, and adding a water reducing agent can reduce the surface tension of water, making the grouting reinforcement material easier to flow and convenient for construction; by adding a suspending agent, the distribution uniformity of the grouting material in the soil or rock can be improved, thereby improving the reinforcement effect. In addition, by adding a defoaming agent, a waterproofing agent, and an air entraining agent, the stability of the slurry can be improved together with the suspending agent. In the present invention, a defoaming agent, a waterproofing agent, and an air entraining agent are used in combination to change the internal microstructure of the stone body by reducing large bubbles and increasing the amount of microbubbles, thereby improving the crack resistance and water-proof and impermeability of the stone body, adding an adhesive can improve the adhesion with the soft rock interface, and adding a water-absorbing resin can reduce the weakening of mud soft rock by water, and increase the micro-deformation self-repairing performance of the stone body. Hydraulic cementitious materials are the main components of grouting reinforcement materials, which have the functions of improving the compressive and tensile strength of grouting reinforcement materials, making the structure more stable, and improving the adhesion between grouting reinforcement materials and soft rock tunnels; the expansion agent reacts with water during the grouting process to produce an expansion effect, which helps to fill the cracks and gaps in the rock and improve the integrity and stability of the structure; the early strength agent can accelerate the cement hydration reaction, so that the grouting reinforcement material can reach a higher strength in a shorter time and shorten the construction period; the rheological agent is used to improve the fluidity and stability of the grouting reinforcement material, which is conducive to construction and can obtain a more uniform reinforcement effect. The present invention prepares the grouting reinforcement material with inorganic materials and organic materials, and limits the amount and composition of the two, so that the grouting reinforcement material has both good injectability and high strength, and its water-proof and anti-seepage properties, crack resistance and self-repairing properties are good.

[0031] In some embodiments, based on the total mass fraction of the grouting reinforcement material as 100%, the mass fraction of the water reducer is 0.1% to 2%, specifically 0.1%, 0.15%, 0.2%, 0.5%, 1%, 2%, etc., which are not limited here. The mass fraction of the suspending agent is 0.02% to 0.1%, specifically 0.02%, 0.05%, 0.1%, etc., which are not limited here. The mass fraction of the defoaming agent is 0.01% to 0.5%, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.5%, etc., which are not limited here. Without limitation, the mass fraction of the waterproofing agent is 0.1% to 0.2%, specifically 0.1%, 0.15%, 0.2%, etc., which is not limited here. The mass fraction of the air entraining agent is 0.01% to 0.05%, specifically 0.01%, 0.02%, 0.05%, etc., which is not limited here. The mass fraction of the adhesive is 0.5% to 10%, specifically 0.5%, 1%, 5%, 10%, etc., which is not limited here. The mass fraction of the water-absorbing resin is 2% to 5%, specifically 2%, 3%, 4%, 5%, etc., which is not limited here.

[0032] The amount of each component in the organic material has a great influence on the performance of the grouting reinforcement material. By limiting the amount of each component, the adhesion, water-proofing and anti-seepage properties, crack resistance and injectability of the interface between the grouting reinforcement material and the mudstone soft rock can be balanced, so that the grouting reinforcement material has good comprehensive performance.

[0033] In some embodiments, taking the total mass fraction of the grouting reinforcement material as 100%, the mass fraction of the water reducer is 0.1% to 0.4%, specifically 0.1%, 0.15%, 0.2%, 0.4%, etc., which are not limited here, the mass fraction of the suspending agent is 0.03% to 0.05%, specifically 0.03%, 0.04%, 0.05%, etc., which are not limited here, the mass fraction of the defoamer is 0.1% to 0.2%, specifically 0.1%, 0.15%, 0.2%, etc., which are not limited here, and the mass fraction of the waterproofing agent is 0.1%. The mass fraction of the air entraining agent is 0.02% to 0.03%, specifically 0.02%, 0.025%, 0.03%, etc., which are not limited here. The mass fraction of the adhesive is 1% to 1.5%, specifically 1%, 1.2%, 1.3%, 1.5%, etc., which are not limited here. The mass fraction of the water-absorbing resin is 2% to 3%, specifically 2%, 2.2%, 2.5%, 3%, etc., which are not limited here.

[0034] By optimizing the amount of organic materials in the grouting reinforcement material, the grouting reinforcement material has better stability and high compressive strength; at the same time, it has good crack resistance and waterproof and anti-seepage properties.

[0035] In some embodiments, the water reducer is at least one of a naphthalene-based water reducer, a melamine water reducer, and a polycarboxylic acid water reducer.

[0036] The above-mentioned water reducing agent can improve the fluidity of the grouting reinforcement material. In addition, the selection of the above-mentioned water reducing agent can increase the density of cement, reduce its porosity, and improve the reinforcement effect.

[0037] In some embodiments, the suspending agent is at least one of hydroxypropyl cellulose, hydroxypropyl methyl cellulose ether, and carboxymethyl cellulose.

[0038] The above three suspending agents have good chemical stability and thermal stability and good solubility in water. In addition, these materials can be adsorbed on the surface of the solid particles selected in the present invention to form a stable suspension, prevent the particles from settling, and improve the stability and effectiveness of the slurry prepared with the grouting reinforcement material.

[0039] In some embodiments, the defoaming agent is a silicone defoaming agent.

[0040] In some embodiments, the waterproofing agent is at least one of a silicone waterproofing agent and a stearic acid metal soap waterproofing agent.

[0041] In some embodiments, the air entraining agent is at least one of a rosin soap-based air entraining agent and a sodium sulfonate-based air entraining agent.

[0042] The above-mentioned restrictions are imposed on the types of defoaming agents, waterproofing agents and air entraining agents. The three can synergistically enhance the reinforcement strength and improve the waterproof and anti-permeability properties of soft rock tunnels.

[0043] In some embodiments, the binder is at least one of polyacrylate latex powder, VAE latex powder, and rubber latex powder.

[0044] The above-mentioned adhesive can change the interface properties between the stone body and the mud soft rock tunnel, and improve the adhesion of the mud soft rock interface.

[0045] The present invention optimizes the types of water reducing agent, suspending agent, defoaming agent, waterproofing agent, air entraining agent and adhesive, and the components can work synergistically. On the one hand, the fluidity of the grouting reinforcement material can be improved, and the construction uniformity can be improved. On the other hand, it helps to enhance the reinforcement strength of the grouting reinforcement material for soft rock tunnels, and improve the waterproof, impermeability and crack resistance.

[0046] In some embodiments, taking the total mass fraction of the grouting reinforcement material as 100%, the mass fraction of the hydraulic cementitious material is 70% to 90%, specifically 70%, 75%, 80%, 90%, etc., which are not limited here; the mass fraction of the expansion agent is 5% to 10%, specifically 5%, 8%, 10%, etc., which are not limited here; the mass fraction of the early strength agent is 0.1% to 2%, specifically 0.1%, 0.5%, 1%, 2%, etc., which are not limited here; the mass fraction of the rheological agent is 0.1% to 10%, specifically 0.1%, 0.5%, 1%, 2%, etc., which are not limited here. Preferably, taking the total mass fraction of the grouting reinforcement material as 100%, the mass fraction of the hydraulic cementitious material is 80% to 85%, specifically 80%, 81%, 82%, 85%, etc., which are not limited here; the mass fraction of the expansion agent is 7% to 10%, specifically 7%, 8%, 10%, etc., which are not limited here; the mass fraction of the early strength agent is 0.1% to 0.5%, specifically 0.1%, 0.2%, 0.5%, etc., which are not limited here; the mass fraction of the rheological agent is 5% to 9%, specifically 5%, 6%, 8%, 9%, etc., which are not limited here. By controlling the amount of each component in the inorganic material, the bonding property and reinforcement strength of the grouting reinforcement material are higher.

[0047] In some embodiments, the hydraulic cementitious material is at least one of silicate cement, sulphoaluminate cement, aluminate cement, and ferroaluminate cement.

[0048] In some embodiments, the expansion agent is at least one of anhydrous gypsum, U-type expansion agent, CEA expansion agent, and alunite expansion agent.

[0049] In some embodiments, the early strength agent is at least one of sodium sulfate, potassium sulfate, nitrate, nitrite, and lithium salt such as lithium carbonate.

[0050] In some embodiments, the rheological agent is at least one of silica fume, fly ash, and slag powder.

[0051] The above-mentioned limitations are imposed on the types of hydraulic cementitious materials, expansion agents, early strength agents and rheological agents. Each material can synergistically enhance the bonding strength between the grouting reinforcement material and the soft rock tunnel, thereby improving its stability and durability. In addition, the grouting reinforcement material composed of the above-mentioned components has a good construction effect and is easier to form a uniform stone body, thus providing better reinforcement and anchoring support for the soft rock tunnel.

[0052] In another typical embodiment of the present invention, a method for preparing the grouting reinforcement material in the above embodiment is provided, comprising the following steps:

[0053] S1, mixing, stirring, and ball-milling a hydraulic cementitious material, an expansion agent, an early strength agent, and a rheological agent to obtain a mixed material;

[0054] S2, mixing the mixed material with a water reducing agent, a suspending agent, a defoaming agent, a waterproofing agent, an air entraining agent, a binder and a water absorbing resin, and stirring to obtain the grouting reinforcement material.

[0055] The preparation method is simple, and the prepared grouting reinforcement material has good uniformity and is suitable for industrial application.

[0056] In some embodiments, in S1, the particle size of the mixture is 1000-2000 meshes. By limiting the particle size of the mixture, the prepared grouting reinforcement material has better fluidity, high injectability, and is easy to construct.

[0057] In some embodiments, in S1, the stirring time is 5 to 15 minutes; in S2, the stirring time is 5 to 15 minutes. When the grouting reinforcement material is prepared under the above conditions, its uniformity and stability are better.

[0058] In another typical embodiment of the present invention, there is provided a use of the grouting reinforcement material in the above embodiment or the grouting reinforcement material prepared by the preparation method in the above embodiment in reinforcing water-absorbing soft rock tunnels.

[0059] In some embodiments, the grouting reinforcement material in the above embodiments is mixed with water in a mass ratio of (1.5-2.5):1 to form a slurry, which is then coated on the water-absorbing soft rock tunnel to achieve reinforcement of the water-absorbing soft rock tunnel.

[0060] The present application is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in the present application.

[0061] The materials used in the following examples and comparative examples are all the same commercially available materials.

[0062] Example 1

[0063] An embodiment of the grouting reinforcement material of the present invention, the formula of the grouting reinforcement material in this embodiment is shown in Table 1, and the preparation method is as follows:

[0064] S1, weighing silicate cement, U-type expansion agent, sodium sulfate, and silica fume according to the proportion, pouring them into a mixer and stirring and mixing for 10 minutes, and then grinding them in a ball mill to 1000 mesh to obtain a mixed material;

[0065] S2, adding polycarboxylic acid water-reducing agent, hydroxypropyl methylcellulose ether, silicone defoaming agent P803, calcium stearate, sodium dodecyl sulfate, VAE latex powder, and water-absorbing resin powder into the mixed material, stirring and mixing in a blender for 10 minutes to obtain a grouting reinforcement material.

[0066] Example 2

[0067] An embodiment of the grouting reinforcement material of the present invention, the formula of the grouting reinforcement material in this embodiment is shown in Table 1, and the preparation method is as follows:

[0068] S1, weighing silicate cement, sulphoaluminate cement, anhydrous gypsum, sodium sulfate and fly ash according to the proportion, pouring them into a mixer and stirring and mixing for 10 minutes, and then grinding them in a ball mill to 1500 mesh to obtain a mixed material;

[0069] S2, adding melamine water reducing agent, hydroxypropyl methyl cellulose ether, silicone defoaming agent P803, calcium stearate, sodium dodecyl sulfate, VAE latex powder and water-absorbing resin powder into the mixed material, stirring and mixing in a mixer for 10 minutes to obtain a grouting reinforcement material.

[0070] Example 3

[0071] An embodiment of the grouting reinforcement material of the present invention, the formula of the grouting reinforcement material in this embodiment is shown in Table 1, and the preparation method is as follows:

[0072] S1, weighing silicate cement, sulphoaluminate cement, anhydrous gypsum, lithium carbonate and fly ash according to the proportion, pouring them into a mixer and stirring and mixing for 10 minutes, and then grinding them in a ball mill to 2000 mesh to obtain a mixed material;

[0073] S2, adding naphthalene-based water reducer, hydroxypropyl methylcellulose ether, silicone defoamer P803, calcium stearate, sodium dodecyl sulfate, VAE latex powder, and water-absorbing resin powder into the mixture, stirring and mixing in a blender for 15 minutes to obtain a grouting reinforcement material.

[0074] Embodiment 4-5

[0075] The embodiments of the grouting reinforcement material of the present invention, the grouting reinforcement material described in embodiments 4 to 5 is different from that in embodiment 1 only in that the content of each component is different, as specifically shown in Table 1.

[0076] Comparative Example 1

[0077] A grouting reinforcement material, the difference between comparative example 1 and embodiment 1 is that no defoaming agent is added and the dosage of each component is different.

[0078] Comparative Example 2

[0079] A grouting reinforcement material, the difference between comparative example 2 and example 1 is only that no waterproofing agent is added and the dosage of each component is different.

[0080] Comparative Example 3

[0081] A grouting reinforcement material, the difference between comparative example 3 and example 1 is only that no air entraining agent is added and the dosage of each component is different.

[0082] Comparative Example 4

[0083] A grouting reinforcement material, the difference between comparative example 4 and example 1 is only that the amount of each component is different.

[0084] Table 1 (mass fraction)

[0085]

[0086]

[0087]

[0088] Performance Testing

[0089] The grouting reinforcement materials in Examples 1 to 5 and Comparative Examples 1 to 4 were mixed with water at a mass ratio of 3:1, and stirred evenly to obtain slurry. The fluidity, compressive strength, crack resistance, and impermeability of the slurry were tested. The test standards are as follows. The test results are shown in Table 2:

[0090] Refer to JC / T 1986-2005 "Cement-based grouting materials" to test fluidity and compressive strength;

[0091] Refer to JC / T 951-2005 "Test method for crack resistance of cement mortar" to test crack resistance;

[0092] Refer to GB / T 50082-2009 "Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete" to test waterproof and impermeability.

[0093] Table 2

[0094]

[0095]

[0096] From the test results in Table 2, it can be seen that Examples 1 to 5 all have good fluidity, and the 1d compressive strength is all above 25 MPa, the initial compressive strength is high, there is no cracking, the crack resistance is good, the impermeability grade is high, and it has good self-repairing performance. Comparative Examples 1 to 4 also have good fluidity, but the initial compressive strength is low, the self-repairing performance is poor, and the crack resistance of Comparative Examples 1 to 3 is also poor.

[0097] In addition, by comparing the test results of Examples 1 to 5, it can be found that the preferred formula of organic materials is: water reducing agent 0.1% to 0.4%, suspending agent 0.03% to 0.05%, defoaming agent 0.1% to 0.2%, waterproofing agent 0.1% to 0.15%, air entraining agent 0.02% to 0.03%, adhesive 1% to 1.5%, water-absorbing resin 2% to 3%. When the mass fraction of each component meets the above-mentioned limitations, the grouting reinforcement material has good fluidity, 1d and 28d compressive strength, crack resistance and self-repairing performance, and is suitable for grouting reinforcement of soft rock tunnels.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grouting reinforcement material, characterized in that: Taking the total mass fraction of the grouting reinforcement material as 100%, the grouting reinforcement material comprises the following components by mass fraction: 85% to 97% of inorganic materials and 3% to 15% of organic materials; The organic materials include water reducing agent, suspending agent, defoaming agent, waterproofing agent, air entraining agent, adhesive and water absorbing resin; The inorganic material comprises a hydraulic gelling material, an expansion agent, an early strength agent and a rheological agent.

2. The grouting reinforcement material according to claim 1, characterized in that: Taking the total mass fraction of the grouting reinforcement material as 100%, the mass fraction of the water reducer is 0.1% to 2%, the mass fraction of the suspending agent is 0.02% to 0.1%, the mass fraction of the defoaming agent is 0.01% to 0.5%, the mass fraction of the waterproofing agent is 0.1% to 0.2%, the mass fraction of the air entraining agent is 0.01% to 0.05%, the mass fraction of the adhesive is 0.5% to 10%, and the mass fraction of the water-absorbing resin is 2% to 5%.

3. The grouting reinforcement material according to claim 2, characterized in that: Taking the total mass fraction of the grouting reinforcement material as 100%, the mass fraction of the water reducer is 0.1% to 0.4%, the mass fraction of the suspending agent is 0.03% to 0.05%, the mass fraction of the defoaming agent is 0.1% to 0.2%, the mass fraction of the waterproofing agent is 0.1% to 0.15%, the mass fraction of the air entraining agent is 0.02% to 0.03%, the mass fraction of the adhesive is 1% to 1.5%, and the mass fraction of the water-absorbing resin is 2% to 3%.

4. The grouting reinforcement material according to any one of claims 1 to 3, characterized in that: The water reducer is at least one of naphthalene water reducer, melamine water reducer and polycarboxylic acid water reducer; and / or the suspending agent is at least one of hydroxypropyl cellulose, hydroxypropyl methyl cellulose ether and carboxymethyl cellulose; and / or the defoaming agent is an organosilicon defoaming agent; and / or the waterproofing agent is at least one of an organosilicon waterproofing agent and a stearic acid metal soap waterproofing agent; and / or the air entraining agent is at least one of a rosin soap air entraining agent and a sodium sulfonate air entraining agent; and / or the adhesive is at least one of a polyacrylate latex powder, a VAE latex powder and a rubber latex powder.

5. The grouting reinforcement material according to claim 4, characterized in that: Taking the total mass fraction of the grouting reinforcement material as 100%, the mass fraction of the hydraulic cementitious material is 70% to 90%, the mass fraction of the expansion agent is 5% to 10%, the mass fraction of the early strength agent is 0.1% to 2%, and the mass fraction of the rheological agent is 0.1% to 10%.

6. The grouting reinforcement material according to claim 5, characterized in that: The hydraulic cementitious material is at least one of silicate cement, sulphoaluminate cement, aluminate cement and ferroaluminate cement; and / or, the expansion agent is at least one of anhydrous gypsum, U-type expansion agent, CEA expansion agent and alum stone expansion agent; and / or, the early strength agent is at least one of sodium sulfate, lithium salt, potassium sulfate, nitrate and nitrite; and / or, the rheological agent is at least one of silica fume, fly ash and slag powder.

7. A method for preparing a grouting reinforcement material according to any one of claims 1 to 6, characterized in that: The steps include: S1, mixing, stirring, and ball-milling a hydraulic cementitious material, an expansion agent, an early strength agent, and a rheological agent to obtain a mixed material; S2, mixing the mixed material with a water reducing agent, a suspending agent, a defoaming agent, a waterproofing agent, an air entraining agent, a binder and a water absorbing resin, and stirring to obtain the grouting reinforcement material.

8. The method for preparing the grouting reinforcement material according to claim 7, characterized in that: In S1, the particle size of the mixed material is 1000-2000 mesh.

9. The method for preparing the grouting reinforcement material according to claim 8, characterized in that: In S1, the stirring time is 5 to 15 minutes; in S2, the stirring time is 5 to 15 minutes.

10. Use of the grouting reinforcement material according to any one of claims 1 to 6 or the grouting reinforcement material prepared by the preparation method according to any one of claims 7 to 9 in reinforcing water-absorbing soft rock tunnels.

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