Controllable water-permeable solidified grouting material, preparation method and application thereof

Abstract

The application discloses a controllable water-permeable solidified grouting material and a preparation method and application thereof, belongs to the technical field of geotechnical engineering foundation reinforcement and underground cavity filling, and aims to solve the technical problem that existing grouting materials are difficult to keep a certain solidified strength and accurately control the water permeability coefficient according to geological requirements to adapt to different hydrogeological environments. The controllable water-permeable solidified grouting material comprises, in weight parts, 45-55 parts of a main solidified base material, 8-18 parts of a water-permeable control system, and 25-35 parts of deionized water. The water-permeable control system comprises porous volcanic rock powder, lignin fiber and modified bentonite, and the mass ratio of the porous volcanic rock powder, the lignin fiber and the modified bentonite is 50:35:15. The porosity of the porous volcanic rock powder is 45%-55%, the length of the lignin fiber is 3 mm-6 mm, and the expansion rate of the modified bentonite is 150%-280%.

Description

Technical Field

[0001] This invention belongs to the field of geotechnical engineering foundation reinforcement and underground cavity filling technology, specifically relating to a controllable permeable solidification grouting material, its preparation method and application. Background Technology

[0002] Currently, geotechnical grouting materials are mainly classified into three categories: cement-based, water glass-based, and industrial solid waste-based. Cement-based grouting materials have high curing strength but poor permeability, and are prone to forming a water-impermeable layer at the filling interface, leading to groundwater erosion and a high risk of cavity recurrence. Water glass-based materials have good fluidity and strong permeability, but low strength and poor durability after curing, and are prone to releasing sodium salts that pollute groundwater, failing to meet environmental protection requirements. Industrial solid waste-based (blast furnace slag, fly ash) grouting materials are environmentally friendly and low in cost, but have weak permeability control capabilities, which can only be roughly adjusted by changing the amount of solid waste added, making it impossible to match the permeability requirements of different geological conditions. Furthermore, the curing strength is easily affected by the origin and particle size of the raw materials, resulting in poor stability.

[0003] In existing technologies, some grouting materials adjust their performance by adding a small amount of additives, but they can only optimize strength (such as the Chinese authorized patent with publication number CN111848089A) or permeability. They cannot achieve precise control of strength and permeability coefficient, making it difficult to match the permeability requirements of different geological types such as gravel, sand, and clay. Furthermore, segregation and pipe blockage are prone to occur during construction, resulting in poor filling effect of complex cavities and difficulty in adapting to the construction requirements of different working conditions. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a controllable permeable curing grouting material, its preparation method and application, so as to solve the technical problem that existing grouting materials are difficult to maintain a certain curing strength while accurately controlling their permeability coefficient to adapt to different hydrogeological environments.

[0005] To achieve the above objectives, the present invention employs the following technical solution: This invention provides a controllable permeable curing grouting material, comprising, by weight: 45-55 parts of the primary curing substrate; Permeability control system: 8-18 parts; 25-35 parts deionized water; The permeability control system comprises: porous volcanic rock powder, lignin fiber, and modified bentonite, wherein the mass ratio of the porous volcanic rock powder, lignin fiber, and modified bentonite is 50:35:15; the porosity of the porous volcanic rock powder is 45% to 55%, the length of the lignin fiber is 3 mm to 6 mm, and the expansion rate of the modified bentonite is 150% to 280%.

[0006] Preferably, the lignin fiber is natural cork extracted fiber with a moisture content ≤8%, ash content ≤5%, and fiber diameter 20μm ~ 50μm; the modified bentonite is sodium-based bentonite modified with sodium citrate, and the amount of sodium citrate added is 1.2% ~ 1.5% of the mass of sodium-based bentonite.

[0007] Preferably, the conductivity of the deionized water is ≤5μS / cm, and its chloride ion content is ≤50mg.

[0008] Preferably, the main solidification substrate includes modified slag powder, ultrafine fly ash and calcined kaolin, and the mass ratio of the slag powder, ultrafine fly ash and calcined kaolin is 65:25:10; The modified slag powder has a specific surface area of ​​4200 cm². 2 / g ~ 4800cm 2 / g, activity index ≥92, free calcium oxide content ≤1.5%; in the calcined kaolin, the active silica mass percentage content ≥45%, and the aluminum oxide mass percentage content ≥38%.

[0009] Preferably, the controllable permeable curing grouting material further includes the following components, in parts by weight: 5 to 12 parts of the active activating component; Rheologically stable component: 1.5 ~ 3.5 parts; Environmentally friendly retarding component: 0.8 ~ 2.2 parts.

[0010] Preferably, the active activating component includes a composite alkali activator, nano-silica, and gypsum whiskers, wherein the mass ratio of the composite alkali activator, nano-silica, and gypsum whiskers is 70:20:10. The rheology stabilizing component includes anionic polyacrylamide, hydroxyethyl cellulose, and polycarboxylate superplasticizer, wherein the mass ratio of the anionic polyacrylamide, hydroxyethyl cellulose, and polycarboxylate superplasticizer is 45:35:20. The environmentally friendly retarding component includes sodium gluconate, citric acid, and sodium lignosulfonate, wherein the mass ratio of sodium gluconate, citric acid, and sodium lignosulfonate is 55:30:15.

[0011] More preferably, the rheology-stabilizing component comprises anionic polypropylene with a molecular weight of 6-8 million, a degree of hydrolysis of 25-30%, a solid content ≥90%, and water-insoluble matter ≤0.5%, prepared as a 0.5% aqueous solution with a viscosity of 300 mPa. s ~ 500 mPa s can adsorb solid particles and prevent aggregate settling.

[0012] Hydroxyethyl cellulose: viscosity 1500~2000 mPa s (2% aqueous solution), with a degree of substitution of 1.8~2.2 and a moisture content of ≤5%, can improve the consistency of grouting materials and enhance suspension stability.

[0013] Polycarboxylate superplasticizer: solid content 40~45%, water reduction rate ≥28%, chloride ion content ≤0.1%, alkali content ≤3%, can reduce the water-cement ratio of grouting materials, improve fluidity, and reduce bleeding.

[0014] Further preferred sodium gluconate: industrial grade, purity ≥98%, moisture ≤2%, heavy metal content ≤10ppm, non-toxic and environmentally friendly, with a mild retarding effect.

[0015] Citric acid: food grade, purity ≥99%, moisture ≤1%, adjustable retardation rate, enhanced retardation effect at low temperatures.

[0016] Sodium lignosulfonate: industrial grade, solid content ≥50%, moisture ≤8%, free of heavy metals, can assist in retarding coagulation and improve slurry dispersibility. Preferably, the composite alkali activator is a mixture of calcium hydroxide and sodium carbonate, with a mass ratio of calcium hydroxide to sodium carbonate of 4:1.

[0017] The present invention also provides a method for preparing the controllable permeable curing grouting material, comprising the following steps: The raw materials for the main curing substrate and the permeability control system are pretreated separately; the permeability control system includes porous volcanic rock powder, lignin fiber and modified bentonite; The main curing substrate and water permeability control system after dry mixing pretreatment according to the specified ratio; After hydration, stirring, and maturation, a controllable permeable curing grouting material is obtained.

[0018] Preferably, the method for preparing the porous volcanic rock powder is as follows: the surface of the pretreated basaltic volcanic rock is modified by using a diluted silane coupling agent, wherein the amount of the diluted silane coupling agent used is 0.5% to 1.0% of the mass of the pretreated basaltic volcanic rock, and the porous volcanic rock powder is obtained by drying.

[0019] This invention also provides an application of the controllable permeable curing grouting material in the combined construction of filling reinforcement and seepage prevention in complex geological types. The complex geological types include one or more of clay, fine sand, and gravel geology. Before the combined construction of filling reinforcement and seepage prevention, the target permeability coefficient is determined through geological survey, and the permeability control system is adjusted according to the following process parameters based on the geological type: Clay geology: The permeability control system is added at a dosage of 8-12 parts by weight, using 3mm-4mm lignin fibers, with the expansion rate of modified bentonite controlled at 150%-180%, and the porosity of porous volcanic rock powder at 45%, so that the target permeability coefficient is stabilized at 1×10⁻⁶.-7 ~ 5×10 -6 m / s; Fine sand geology: The permeability control system is added at a dosage of 12-15 parts by weight, using 4mm-5mm lignin fibers, modified bentonite with an expansion rate of 200%-230%, and porous volcanic rock powder with a porosity of 50%, so as to stabilize the target permeability coefficient at 5×10⁻⁶. -6 ~ 1×10 -5 m / s; Gravel geology: The permeability control system is added at a dosage of 15-18 parts by weight, using 5mm-6mm lignin fibers, modified bentonite with an expansion rate of 250%-280%, and porous volcanic rock powder with a porosity of 55%, so as to stabilize the target permeability coefficient at 1×10⁻⁶. -5 ~ 5×10 -4 m / s.

[0020] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a controllable permeable curing grouting material, wherein the main curing substrate comprises 45-55 parts, which forms the strength framework; a proportion below 45% results in insufficient strength, while a proportion above 55% will compress the space of the permeability control system, leading to uncontrolled permeability. The permeability control system comprises 8-18 parts (porous volcanic rock powder: lignin fiber: modified bentonite = 50:35:15). By adjusting the dosage and raw material parameters of this system, a permeability coefficient of 1×10⁻⁶ can be achieved. -7 ~ 5×10 -4Linearly adjustable within the m / s range. In the permeability control system, porous volcanic rock powder (porosity 45% ~ 55%) itself has interconnected pores, serving as the physical framework of the main permeable channel and enhancing the interfacial bonding force between the porous volcanic rock powder and the main solidification substrate, preventing pore collapse in the later stage; lignin fiber (length 3mm ~ 6mm) is three-dimensionally randomly overlapped, forming interconnected water-conducting channels through fiber overlap. The length of this fiber can be adjusted according to the target permeability coefficient. The longer the length, the smoother the pore channels formed by fiber overlap, and the higher the permeability coefficient; modified bentonite (expansion rate 150% ~ 280%) expands upon contact with water, filling the gaps in the coarse pores and regulating permeability in the reverse direction. The greater the expansion, the smaller the effective flow cross section. Controlling the expansion rate upon contact with water to 150% ~ 280% allows for precise control of the degree of pore closure after the controllable permeable solidification grouting material comes into contact with water. 25-35.9 parts of deionized water are used as the hydration medium, and the moisture content of the grouting material is controlled at 30%-38%. A moisture content below 30% results in insufficient fluidity, while a content above 38% leads to bleeding and reduced strength. This invention introduces porous volcanic rock powder and lignin fiber, which can positively regulate permeability, and modified bentonite, which can reversely regulate permeability, into the grouting material. This allows the controllable permeability-cured grouting material to maintain a certain curing strength while precisely controlling its permeability coefficient according to geological requirements, thus addressing the technical challenge of adapting to different hydrogeological environments.

[0021] Furthermore, natural cork extract fibers with a moisture content of ≤8%, ash content of ≤5%, and fiber diameter of 20~50μm are selected to ensure that they are free from mold and impurities. Sodium citrate is used to modify bentonite, which can adjust the expansion rate of the modified bentonite. The expansion rate decreases as the amount of sodium citrate added increases, thereby precisely controlling the degree of pore closure of the grouting material after it comes into contact with water.

[0022] Furthermore, using deionized water with a chloride ion content ≤50mg and conductivity ≤5μS / cm can prevent corrosion of underground metal components.

[0023] Furthermore, the main solidification substrate includes modified slag powder, ultrafine fly ash, and calcined kaolin, with a specific surface area of ​​4200 cm². 2 / g ~ 4800cm 2 Modified slag powder with an activity index ≥92 and free calcium oxide content ≤1.5% ensures stable hydration activity and provides a basic solidification skeleton for grouting materials; calcined kaolin with an active silica content ≥45% and an alumina content ≥38% enhances hydration activity and strengthens cementing ability, while retaining micropores to reserve space for water permeability control of grouting materials.

[0024] Furthermore, the active activating component includes a composite alkali activator, nano-silica, and gypsum whiskers in a mass ratio of 70:20:10, used to accelerate the hydration of the main curing substrate, refine pores, and stabilize strength; the rheology stabilizing component includes anionic polyacrylamide, hydroxyethyl cellulose, and polycarboxylate superplasticizer in a mass ratio of 45:35:20, used to improve the fluidity of the grouting material, prevent solid-liquid separation, and adapt to long-distance and narrow cavity grouting; the environmentally friendly retarding component includes sodium gluconate, citric acid, and sodium lignosulfonate in a mass ratio of 55:30:15, used to adjust the curing time and adapt to complex construction environments.

[0025] Furthermore, an alkali activator is obtained by using calcium hydroxide and sodium carbonate in a mass ratio of 4:1. Sodium carbonate provides alkalinity, while calcium hydroxide provides the calcium source. The 4:1 ratio balances alkali activation and ettringite formation, effectively activating the potential hydraulic properties of the main curing substrate under mild alkaline conditions. At the same time, the synergistic effect of anions and cations is used to regulate the types and microstructure of hydration products, thereby improving early strength and curing durability while ensuring the construction window.

[0026] The present invention also provides a method for preparing the controllable permeable curing grouting material, which first pre-treats the main curing substrate and the permeability control system respectively; then hydrates it after dry stirring: to avoid the lignin fibers from clumping together when exposed to water, and to prevent the modified bentonite from expanding in advance and wrapping the surface of the modified slag powder to hinder activation; finally, it undergoes a curing process to make the early strength development faster.

[0027] Furthermore, volcanic rock powder itself is a porous, inert aggregate. If it is directly mixed with the main solidification substrate, the interface transition zone is a weak point, easily peeling off along the pore walls under stress, thus becoming water-permeable. Therefore, this invention uses a diluted silane coupling agent to modify the surface of the pretreated basaltic volcanic rock, enhancing the interfacial bonding force between the porous volcanic rock powder and the main solidification substrate, and preventing later pore collapse. The basaltic volcanic rock powder modified and coated with the silane coupling agent strengthens the walls of the permeable channels, improving resistance to erosion and long-term seepage erosion while maintaining the permeability coefficient, without sacrificing strength for permeability.

[0028] This invention also provides the application of the controllable permeable curing grouting material in the combined construction of filling, reinforcement, and seepage prevention in complex geological conditions, enabling the permeability coefficient of the grouting material of this invention to be 10 according to geological conditions. -7 m / s ~ 10 -4 The permeability is continuously adjustable in three m / s ranges, thus achieving precise control of water permeability to adapt to different hydrogeological conditions while maintaining the solidification strength. Detailed Implementation

[0029] To enable those skilled in the art to understand the features and effects of the present invention, the following descriptions and definitions are only general descriptions of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in the event of any conflict, the definitions in this specification shall prevail.

[0030] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0031] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0032] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0033] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0034] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0035] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" represents weight percentage, "parts" represents parts by weight, and "ratio" represents weight proportion.

[0036] The preparation method of the controllable permeable grouting material of the present invention includes the following steps: (a) Raw material pretreatment Pretreatment of the main curing substrate: Take modified slag powder, ultrafine fly ash and calcined kaolin respectively, and pass them through a 300-mesh standard sieve to remove impurities and coarse particles; weigh the three raw materials in a mass ratio of 65:25:10, put them into a twin-shaft horizontal mixer, stir at 35 r / min at room temperature for 20 min, and after mixing evenly, put them into a sealed PE bag and store them in a dry and cool place with an ambient humidity ≤60% for later use.

[0037] The specific pretreatment methods for each component are as follows: Modified slag powder: Water-quenched blast furnace slag is selected as raw material. It is first crushed to a particle size ≤5cm by a jaw crusher, and then fed into a rotary kiln. It is calcined at a constant temperature of 800~850℃ for 2.5h. During the calcination process, the oxygen content in the kiln is controlled at 6%~8% to avoid over-burning and deactivation of the slag. After calcination, it is naturally cooled to room temperature and then ground in a ball mill. The grinding media is steel balls with a diameter of 10~20mm. The grinding time is 4h, and the specific surface area is controlled to be 4200~480cm². 2 / g, activity index ≥92, free calcium oxide content ≤1.5%.

[0038] Calcined kaolin: Natural kaolin is selected, crushed to a particle size ≤3cm, washed with water to remove mud and sand impurities, drained and then sent into a box-type resistance furnace for constant temperature calcination at 600~650℃ for 2h, with the heating rate controlled at 5℃ / min. After calcination, it is cooled and ground until the 200-mesh sieve passing rate is ≥95%, the active silica content is ≥45%, and the alumina content is ≥38%. After calcination, the crystal water is removed, the hydration activity is improved, the cementing ability of the substrate is enhanced, and at the same time, the micropores are retained to reserve space for water permeability control.

[0039] Pretreatment of permeable water control system: (1) Pretreatment of porous volcanic rock powder: Basaltic volcanic rock is selected, crushed and then subjected to two-stage crushing by jaw crusher and cone crusher, and then screened by vibrating screen to obtain 20~60 mesh particles. Fine powder impurities are removed by passing through a 40 mesh screen to obtain a porosity of 45~55% and a bulk density of 0.8~1.0 g / cm³. 3 Volcanic rock powder; prepare a silane coupling agent dilution solution by mixing KH~550 with anhydrous ethanol at a mass ratio of 1:20 and stirring for 5 minutes until homogeneous; place the volcanic rock powder in a mixing tank and spray the dilution solution evenly onto the surface of the volcanic rock powder using a high-pressure sprayer while stirring (40 r / min), with a spraying amount of 0.5%~1.0% (preferably 0.8%) of the mass of the volcanic rock powder; after spraying, continue stirring for 10 minutes to ensure uniform surface coating; transfer to a tray with a thickness ≤5 cm, place in an 80℃ forced-air drying oven, dry for 1 hour, remove and allow to cool naturally to room temperature for later use.

[0040] (2) Lignin fiber pretreatment: screen 3~6mm fibers, remove impurities, spread them on a tray, dry at 60℃ for 30min, control the moisture content to ≤8%, seal after cooling, and set aside for later use.

[0041] (3) Pretreatment of modified bentonite: Weigh sodium-based bentonite and weigh sodium citrate at 1.2% to 1.5% (preferably 1.3%) of the mass of sodium-based bentonite; add sodium citrate to deionized water to prepare a 10% concentration solution and stir to dissolve; add sodium-based bentonite and stir at room temperature for 1.5 hours (60 r / min); let stand for 2 hours, filter the supernatant, dry the precipitate at 105℃ for 3 hours, grind to 200 mesh, and control the water swelling rate to 150 to 280% for later use; (4) Compounding: Weigh the pretreated volcanic rock powder, lignin fiber and modified bentonite in a mass ratio of 50:35:15, put them into a high-speed disperser, rotate at 900 r / min, stir at room temperature for 15 min, disperse evenly and seal for later use.

[0042] Pretreatment of active activating components: Weigh the composite alkali activator, nano silica and gypsum whiskers in a mass ratio of 70:20:10, put them into a small ball mill, use 5mm steel balls as the grinding media, grind for 10 minutes, mix evenly, put into a sealed bottle, and set aside for later use.

[0043] The specific pretreatment methods for each of the above-mentioned active activation components are as follows: Composite alkali activator: Calcium hydroxide and sodium carbonate are mixed at a mass ratio of 4:1. The calcium hydroxide is industrial grade, with a fineness of ≥95% passing through a 200-mesh sieve and an effective calcium oxide content of ≥90%. The sodium carbonate is industrial grade, with a fineness of ≥98% passing through a 200-mesh sieve and a purity of ≥98%. After mixing, the mixture is fed into a twin-shaft mixer and stirred at room temperature for 10 minutes until uniformly mixed. It is then sealed and stored to prevent moisture absorption and deterioration.

[0044] Nano-silica: Prepared by gas phase method, with a particle size of 20~40nm, a specific surface area of ​​180~220m² / g, a silica content of ≥99%, a dispersibility index of ≤0.2, no agglomeration, can quickly fill the micropores of the substrate, refine the structure of hydration products, and improve strength and stability.

[0045] Gypsum whiskers: Dihydrate gypsum is selected as the raw material, and water is added to prepare a 20% concentration slurry. The slurry is sent to a reactor and reacted at 120℃ and 0.2MPa for 4 hours to generate gypsum whiskers. After the reaction, the mixture is cooled, filtered, and washed with water to remove impurities. It is then dried at 105℃ for 2 hours. Whiskers with a length of 8~12μm and a diameter of 0.8~1.2μm are screened, with an aspect ratio of 10~15. They are free from agglomeration and can enhance the toughness of the material, inhibit cracking after curing, and refine the pores.

[0046] Rheology stabilizer and environmentally friendly retarder: Weigh them separately according to the formula, no pretreatment required, seal and store to avoid moisture absorption, ready for use.

[0047] (II) Stepwise mixing preparation First-stage dry mixing: Based on a total weight of 100 parts, weigh 45-55 parts of the pretreated main curing substrate, 8-18 parts of the water permeability control system, and 5-12 parts of the active activating component, put them into a forced mixer, and stir at room temperature dry state for 15 minutes with the stirring paddle speed at 55 r / min to ensure that the solid materials do not agglomerate or separate into layers and are mixed evenly.

[0048] Secondary additive mixing: Add 1.5~3.5 parts of rheology stabilizer and 0.8~2.2 parts of environmentally friendly retarder to the material after primary dry mixing. Adjust the mixer speed to 45 r / min and continue dry mixing for 10 min to ensure that the rheology stabilizer and environmentally friendly retarder are uniformly adsorbed on the surface of the solid particles and avoid local enrichment.

[0049] Hydration and mixing: Add 25-35 parts of deionized water in three batches, controlling the final moisture content of the slurry to 30-38%. (1) First addition of water: Add 50% of the total water volume, stir at 45 r / min for 8 min to initially hydrate and form a uniform slurry; (2) Secondary water addition: Add 30% of the total water volume, rotate at 40 r / min, stir for 7 min to refine the slurry and reduce air bubbles; (3) Final water addition: Add the remaining 20% ​​water, rotate at 35 r / min, stir for 10 min, and control the slurry temperature ≤ 35℃ throughout the process to avoid high temperature accelerating hydration; stir until the slurry is uniform, without obvious particles, and without a large number of air bubbles, and the fluidity is controlled at 220 mm~260 mm. The fluidity test adopts GB / T2419 standard.

[0050] Static curing: The stirred slurry is transferred to a sealed storage tank. The temperature inside the tank is controlled at 20~25℃. Stir slowly (12r / min) and let it stand for 35 minutes to eliminate residual air bubbles and allow the components to undergo preliminary hydration reaction. The slurry properties are stabilized, and after curing, a controllable permeable curing grouting material is obtained.

[0051] III. Precise Control Technology for Permeability Coefficient Before construction, the target permeability coefficient is determined through geological survey. Based on the geological type, precise control is achieved by adjusting the dosage of the permeability control system, the length of lignin fibers, and the expansion rate of modified bentonite. The specific process parameters are as follows: Suitable for clay soil (target permeability coefficient 1×10) -7 ~ 5×10 -6m / s): The permeability control system dosage is controlled at 8~12 parts by weight; 3~4mm short lignin fibers are selected to reduce the pore channel length; the expansion rate of modified bentonite is controlled at 150%~180%, and the pores are moderately closed after contact with water; porous volcanic rock powder accounts for 45% of the permeability control system to reduce the pore connectivity rate. After preparation, the permeability coefficient is tested according to the JISA1218 standard and is stable within the target range.

[0052] Suitable for fine sandy soil (target permeability coefficient 5×10) -6 ~ 1×10 -5 m / s): The permeability control system dosage is controlled at 12~15 by weight; 4~5mm medium-length fibers are selected; the expansion rate of modified bentonite is 200~230%; the proportion of porous volcanic rock powder is 50%, balancing pore connectivity, and the permeability coefficient fluctuation is ≤±12%.

[0053] Gravel geological compatibility (target permeability coefficient 1×10) -5 ~ 5×10 -4 m / s): The permeability control system dosage is controlled at 15~18 parts by weight; 5mm~6mm long lignin fibers are selected to enhance pore channels; the modified bentonite has an expansion rate of 250~280% to reduce pore closure; the porous volcanic rock powder accounts for 55% to improve pore connectivity and ensure that the permeability coefficient meets the standard.

[0054] IV. Construction and Curing Control Process (I) Grouting Construction Technology Equipment preparation: Select a high-pressure grouting machine with a grouting pipe diameter of 25mm and a grouting nozzle diameter of 8mm. Before construction, check the equipment for sealing and flush the pipeline with clean water to ensure there are no blockages or leaks.

[0055] Grouting parameters: Grouting pressure control 0.8~1.5MPa, 1.2~1.5MPa for high void density, and 0.8~1.0MPa for loose voids; Grouting speed 20~30L / min, avoid excessive speed to prevent grout segregation.

[0056] Construction operation: The spacing between grouting holes is 1.5~2.0m, and skip-hole grouting is adopted to prevent grout leakage; the pressure of the cavity is monitored in real time during the grouting process. When the pressure rises suddenly, the grouting speed is reduced, and the speed is increased slowly after the pressure stabilizes to ensure that the cavity is filled tightly without gaps.

[0057] (ii) Curing time control At room temperature (20~25℃): add 1.2~1.5 parts by weight of environmentally friendly retarding component, cure time 4~6h, initial setting in 2h, final setting in 6h.

[0058] Low temperature environment (5~15℃): The environmentally friendly retarding component is increased to 2.0~2.2 parts by weight, the curing time is 8~12h, the initial setting time is 4h, the final setting time is 12h, the slow hydration at low temperature avoids a sudden drop in strength.

[0059] High temperature environment (30~35℃): Reduce the environmentally friendly retarding component to 0.8~1.1 parts by weight, the curing time is 4~5h, the initial setting is 1.5h, and the final setting is 5h, which accelerates hydration and prevents the slurry from bleeding.

[0060] (III) Curing and Performance Control Curing conditions: After grouting is completed, it should be naturally cured at room temperature, avoiding exposure to direct sunlight and rain; in low-temperature environments, it should be covered with insulation cotton for curing, with a curing cycle of 7 to 28 days.

[0061] Performance indicators: After 7 days of curing, compressive strength ≥3.5MPa; after 28 days of curing, compressive strength ≥6.0MPa, permeability coefficient fluctuation ≤±15%, meeting the requirements for long-term geological use.

[0062] Example 1 Components: 48 parts of main curing substrate, 9 parts of water permeability control system, 7 parts of active activating component, 2.1 parts of rheology stabilizing component, 1.3 parts of environmentally friendly retarding component, and 32.6 parts of deionized water.

[0063] Specific components: The main curing substrate is composed of modified slag powder, ultrafine fly ash, and calcined kaolin in a mass ratio of 65:25:10. The modified slag powder has a specific surface area of ​​4400 cm². 2 / g, activity index 93, free calcium oxide content 1.3%; the calcined kaolin contains 46% active silica and 39% aluminum oxide.

[0064] Permeability control system: porous volcanic rock powder, lignin fiber, and modified bentonite in a mass ratio of 50:35:15. The porous volcanic rock powder has a porosity of 48%; the lignin fiber has a length of 4 mm, a moisture content of 6%, an ash content of 4%, and a fiber diameter of 35 μm; the modified bentonite is sodium citrate-modified sodium-based bentonite, with sodium citrate added at 1.3% of the mass of the sodium-based bentonite, and an expansion rate of 180%.

[0065] The active activating components are composed of a composite alkaline activator (calcium hydroxide: sodium carbonate = 4:1), nano silica, and gypsum whiskers in a mass ratio of 70:20:10.

[0066] Rheology stabilizing components: anionic polyacrylamide, hydroxyethyl cellulose, and polycarboxylate superplasticizer are composed in a mass ratio of 45:35:20.

[0067] Environmentally friendly retarding components: sodium gluconate, citric acid, and sodium lignosulfonate in a mass ratio of 55:30:15.

[0068] Deionized water: conductivity 4.0 μS / cm, chloride ion content 32 mg / L.

[0069] Preparation method: (1) Raw material pretreatment: The main curing substrate, the water permeability control system, and the active activation component were pretreated according to the preparation method of the present invention. The porous volcanic rock powder was modified with silane coupling agent KH-550, and the amount was 0.8% of the mass of the volcanic rock powder; the amount of sodium citrate added to the modified bentonite was 1.3%.

[0070] (2) First-stage dry mixing: Weigh 48 parts of the pretreated main curing substrate, 9 parts of the water permeability control system, and 7 parts of the active activation component, put them into a forced mixer, and stir at room temperature dry state for 15 min with the stirring paddle speed at 55 r / min.

[0071] (3) Mixing of secondary additives: Add 2.1 parts of rheological stabilizer and 1.3 parts of environmentally friendly retarder, adjust the speed to 45 r / min, and continue to stir in a dry state for 10 min.

[0072] (4) Hydration and stirring: Add 32.6 parts of deionized water in three batches (50% for the first batch, 30% for the second batch, and 20% for the last batch), and stir at 45 r / min for 8 min, 40 r / min for 7 min, and 35 r / min for 10 min in sequence. The temperature of the slurry is controlled to be ≤35℃ throughout the process, and the fluidity is controlled to be 220~260 mm.

[0073] (5) Static curing: Transfer to a sealed storage tank and slowly stir (12 r / min) at 20~25℃ for 35 min to obtain controllable permeable curing grouting material.

[0074] Performance testing: 28-day compressive strength 6.2 MPa, permeability coefficient 3.2×10⁻⁶ -6 m / s, fluidity 235 mm, initial setting time 3.8 h, final setting time 5.5 h.

[0075] Example 2 Components: 52 parts of main curing substrate, 13 parts of water permeability control system, 9 parts of active activating component, 2.8 parts of rheology stabilizing component, 1.6 parts of environmentally friendly retarding component, and 30.6 parts of deionized water.

[0076] Specific components: Main curing substrate: modified slag powder, ultrafine fly ash, and calcined kaolin in a mass ratio of 65:25:10. The modified slag powder has a specific surface area of ​​4600 cm². 2 / g, activity index 94, free calcium oxide 1.2%; calcined kaolin with active SiO2 47% and Al2O3 40%.

[0077] Permeability control system: Porous volcanic rock powder: lignin fiber: modified bentonite = 50:35:15. Porosity 50%; fiber length 5mm, moisture content 7%, ash content 4.5%, fiber diameter 40μm; modified bentonite sodium citrate addition 1.4%, expansion rate 220%.

[0078] Active activating components: composite alkali activator (4:1), nano silica, gypsum whiskers = 70:20:10.

[0079] Rheology stabilizer: Anionic polyacrylamide: Hydroxyethyl cellulose: Polycarboxylate superplasticizer = 45:35:20.

[0080] Environmentally friendly retarding components: sodium gluconate: citric acid: sodium lignosulfonate = 55:30:15.

[0081] Deionized water: conductivity 3.8 μS / cm, chloride ion 28 mg / L.

[0082] Preparation method: Same as in Example 1, performed according to the weight proportions of this example. The only difference is that when the porous volcanic rock powder is modified with silane coupling agent KH-550, the amount used is 0.5% of the mass of the volcanic rock powder; Performance testing: 28-day compressive strength 7.1 MPa, permeability coefficient 8.7×10⁻⁶ -6 m / s, fluidity 242 mm, initial setting time 4.2 h, final setting time 6.1 h.

[0083] Example 3 Components: 46 parts of main curing substrate, 17 parts of water permeability control system, 11 parts of active activating component, 1.9 parts of rheology stabilizing component, 1.9 parts of environmentally friendly retarding component, and 34.2 parts of deionized water.

[0084] Specific components: Main curing substrate: same proportion, modified slag micro powder with a specific surface area of ​​4300 cm² 2 / g, activity index 92, free calcium oxide 1.4%; calcined kaolin with active SiO2 45% and Al2O3 38%.

[0085] Water permeability control system: porosity 53%; fiber length 5.5mm, moisture content 5%, ash content 3.5%, fiber diameter 30μm; modified bentonite sodium citrate addition 1.2%, expansion rate 260%.

[0086] The proportions of the remaining components are the same as in Example 1.

[0087] The conductivity of deionized water is 4.5 μS / cm, and the chloride ion concentration is 40 mg / L.

[0088] Preparation method: Same as in Example 1, performed according to the weight proportions of this example. The only difference is that when the porous volcanic rock powder is modified with silane coupling agent KH-550, the amount used is 1.0% of the mass of the volcanic rock powder; Performance testing: 28-day compressive strength 5.8 MPa, permeability coefficient 4.5×10⁻⁶ -5 m / s, fluidity 228 mm, initial setting time 5.1 h, final setting time 7.3 h.

[0089] Example 4 Composition: 50 parts of main curing substrate, 11 parts of water permeability control system, 6 parts of active activating component, 3.2 parts of rheology stabilizing component, 0.9 parts of environmentally friendly retarding component, and 33.7 parts of deionized water.

[0090] Specific components: Main curing substrate: Modified slag micro powder with a specific surface area of ​​4500 cm² / g, an activity index of 93, and 1.1% free calcium oxide; calcined kaolin with 46% active SiO2 and 39% Al2O3.

[0091] Water permeability control system: porosity 47%; fiber length 3.5mm, moisture content 8%, ash content 5%, fiber diameter 25μm; modified bentonite sodium citrate addition 1.5%, expansion rate 160%.

[0092] The proportions of the remaining components are the same as in Example 1.

[0093] The conductivity of deionized water is 3.2 μS / cm, and the chloride ion concentration is 22 mg / L.

[0094] Preparation method: Same as in Example 1, performed according to the weight proportions of this example.

[0095] Performance testing: 28-day compressive strength 6.5 MPa, permeability coefficient 5.9×10⁻⁶ -6 m / s, fluidity 251 mm, initial setting time 3.2 h, final setting time 4.8 h.

[0096] Example 5 Components: 54 parts of main curing substrate, 15 parts of water permeability control system, 8 parts of active activating component, 2.5 parts of rheology stabilizing component, 2.1 parts of environmentally friendly retarding component, and 28.4 parts of deionized water.

[0097] Specific components: Main curing substrate: Modified slag micro powder with a specific surface area of ​​4700 cm² 2 / g, activity index 95, free calcium oxide 0.9%; calcined kaolin with active SiO2 48% and Al2O3 41%.

[0098] Water permeability control system: porosity 52%; fiber length 5.8 mm, moisture content 6.5%, ash content 4.2%, fiber diameter 38 μm; modified bentonite sodium citrate addition 1.3%, expansion rate 270%.

[0099] The proportions of the remaining components are the same as in Example 1.

[0100] The conductivity of deionized water is 3.0 μS / cm, and the chloride ion concentration is 18 mg / L.

[0101] Preparation method: Same as in Example 1, performed according to the weight proportions of this example.

[0102] Performance testing: 28-day compressive strength 7.5 MPa, permeability coefficient 2.3×10⁻⁶ -5 m / s, fluidity 231 mm, initial setting time 5.8 h, final setting time 8.2 h.

[0103] Example 6 Components: 47 parts of main curing substrate, 10 parts of water permeability control system, 10 parts of active activating component, 1.7 parts of rheology stabilizing component, 1.4 parts of environmentally friendly retarding component, and 35.9 parts of deionized water.

[0104] Specific components: Main curing substrate: Modified slag micro powder with a specific surface area of ​​4400 cm² 2 / g, activity index 92, free calcium oxide 1.3%; calcined kaolin with active SiO2 46% and Al2O3 38%.

[0105] Water permeability control system: porosity 48%; fiber length 4mm, moisture content 6%, ash content 4%, fiber diameter 35μm; modified bentonite sodium citrate addition 1.3%, expansion rate 200%.

[0106] The proportions of the remaining components are the same as in Example 1.

[0107] The conductivity of deionized water is 4.2 μS / cm, and the chloride ion concentration is 35 mg / L.

[0108] Preparation method: Same as in Example 1, performed according to the weight proportions of this example.

[0109] Performance testing: 28-day compressive strength 6.0 MPa, permeability coefficient 4.1×10⁻⁶ -6 m / s, fluidity 225 mm, initial setting time 4.5 h, final setting time 6.7 h.

[0110] Example 7 Components: 51 parts of main curing substrate, 16 parts of water permeability control system, 5 parts of active activating component, 3.4 parts of rheology stabilizing component, 1.7 parts of environmentally friendly retarding component, and 32.9 parts of deionized water.

[0111] Specific components: Main curing substrate: Modified slag micro powder with a specific surface area of ​​4550 cm² 2 / g, activity index 93, free calcium oxide 1.2%; calcined kaolin with active SiO2 47% and Al2O3 40%.

[0112] Water permeability control system: porosity 54%; fiber length 5.2 mm, moisture content 7.2%, ash content 4.8%, fiber diameter 42 μm; modified bentonite sodium citrate addition 1.4%, expansion rate 250%.

[0113] The proportions of the remaining components are the same as in Example 1.

[0114] The conductivity of deionized water is 3.6 μS / cm, and the chloride ion concentration is 26 mg / L.

[0115] Preparation method: Same as in Example 1, performed according to the weight proportions of this example.

[0116] Performance testing: 28-day compressive strength 6.8 MPa, permeability coefficient 3.6×10⁻⁶ -5 m / s, fluidity 248 mm, initial setting time 4.9 h, final setting time 7.5 h.

[0117] Example 8 Components: 49 parts of main curing substrate, 12 parts of water permeability control system, 8 parts of active activating component, 2.3 parts of rheology stabilizing component, 1.1 parts of environmentally friendly retarding component, and 31.6 parts of deionized water.

[0118] Specific components: Main curing substrate: Modified slag micro powder with a specific surface area of ​​4350 cm² 2 / g, activity index 92, free calcium oxide 1.4%; calcined kaolin with active SiO2 45% and Al2O3 38%.

[0119] Water permeability control system: porosity 49%; fiber length 4.8 mm, moisture content 6.8%, ash content 4.1%, fiber diameter 33 μm; modified bentonite sodium citrate addition 1.2%, expansion rate 190%.

[0120] The proportions of the remaining components are the same as in Example 1.

[0121] The conductivity of deionized water is 4.1 μS / cm, and the chloride ion concentration is 33 mg / L.

[0122] Preparation method: Same as in Example 1, performed according to the weight proportions of this example.

[0123] Performance testing: 28-day compressive strength 6.4 MPa, permeability coefficient 7.3×10⁻⁶-6 m / s, fluidity 238 mm, initial setting time 3.9 h, final setting time 5.9 h.

[0124] Example 9 Composition: 45 parts of main curing substrate, 8 parts of water permeability control system, 5 parts of active activating component, 1.5 parts of rheology stabilizing component, 0.8 parts of environmentally friendly retarding component, and 25 parts of deionized water.

[0125] Specific components: Main curing substrate: Modified slag micro powder with a specific surface area of ​​4200 cm² 2 / g, activity index 92, free calcium oxide 1.5%; calcined kaolin with active SiO2 46% and Al2O3 39%.

[0126] Water permeability control system: porous volcanic rock powder with a porosity of 45%; lignin fiber with a length of 3mm, a moisture content of 8%, an ash content of 5%, and a fiber diameter of 20μm; modified bentonite sodium citrate with an addition amount of 1.2% and an expansion rate of 150%.

[0127] Active activating components: composite alkali activator (4:1), nano silica, gypsum whiskers = 70:20:10.

[0128] Rheology stabilizer: Anionic polyacrylamide: Hydroxyethyl cellulose: Polycarboxylate superplasticizer = 45:35:20.

[0129] Environmentally friendly retarding components: sodium gluconate: citric acid: sodium lignosulfonate = 55:30:15.

[0130] Deionized water: conductivity 4.8 μS / cm, chloride ion 42 mg / L.

[0131] Preparation method: Same as in Example 1, but performed according to the weight parts of this example.

[0132] Performance testing: 28-day compressive strength 5.8 MPa, permeability coefficient 1.2×10⁻⁶ -7 m / s, fluidity 218 mm, initial setting time 3.5 h, final setting time 5.2 h.

[0133] Example 10 Components: 55 parts of main curing substrate, 18 parts of water permeability control system, 12 parts of active activating component, 3.5 parts of rheology stabilizing component, 2.2 parts of environmentally friendly retarding component, and 35 parts of deionized water.

[0134] Specific components: Main curing substrate: Modified slag micro powder with a specific surface area of ​​4800 cm² 2 / g, activity index 94, free calcium oxide 1.2%; calcined kaolin with active SiO2 48% and Al2O3 40%.

[0135] Water permeability control system: porosity 55%; lignin fiber length 6mm, moisture content 5%, ash content 3%, fiber diameter 50μm; modified bentonite sodium citrate addition 1.5%, expansion rate 280%.

[0136] The proportions of the remaining components are the same as in Example 9.

[0137] The conductivity of deionized water is 3.5 μS / cm, and the chloride ion concentration is 28 mg / L.

[0138] Preparation method: Same as in Example 1, performed according to the weight proportions of this example.

[0139] Performance testing: 28-day compressive strength 7.8 MPa, permeability coefficient 4.8 × 10⁻⁶ -4 m / s, fluidity 255 mm, initial setting time 6.2 h, final setting time 8.8 h.

[0140] Example 11 Composition: 50 parts of main curing substrate, 13 parts of water permeability control system, 8 parts of active activating component, 2.5 parts of rheology stabilizing component, 1.5 parts of environmentally friendly retarding component, and 32 parts of deionized water.

[0141] Specific components: Main curing substrate: Modified slag micro powder with a specific surface area of ​​4500 cm² 2 / g, activity index 93, free calcium oxide 1.3%; calcined kaolin with active SiO2 47% and Al2O3 39%.

[0142] Water permeability control system: porosity 50%; lignin fiber length 4.5mm, moisture content 6%, ash content 4%, fiber diameter 35μm; modified bentonite sodium citrate addition 1.3%, expansion rate 210%.

[0143] Active activating components: composite alkali activator (4:1), nano silica, gypsum whiskers = 70:20:10.

[0144] Rheology stabilizer: Anionic polyacrylamide: Hydroxyethyl cellulose: Polycarboxylate superplasticizer = 45:35:20.

[0145] Environmentally friendly retarding components: sodium gluconate: citric acid: sodium lignosulfonate = 55:30:15.

[0146] Deionized water: conductivity 3.8 μS / cm, chloride ion 30 mg / L.

[0147] The porous volcanic rock powder was modified with silane coupling agent KH-550 at a dosage of 0.8% of the volcanic rock powder mass.

[0148] Preparation method: Same as in Example 1, performed according to the weight proportions of this example.

[0149] Performance testing: 28-day compressive strength 6.9 MPa, permeability coefficient 9.5×10⁻⁶ -6 m / s, fluidity 240 mm, initial setting time 4.0 h, final setting time 5.8 h.

[0150] Example 12 Components: 48 parts of main curing substrate, 10 parts of water permeability control system, 7 parts of active activating component, 2.1 parts of rheology stabilizing component, 1.3 parts of environmentally friendly retarding component, and 32.6 parts of deionized water.

[0151] Specific components: Permeability control system: porous volcanic rock powder: lignin fiber: modified bentonite = 50:35:15. Porosity 45%; lignin fiber length 3mm; modified bentonite expansion rate 160%; sodium citrate addition 1.2%.

[0152] The remaining components are the same as in Example 1 (the proportion of the main curing substrate, the active activating components, etc. are all the same).

[0153] The conductivity of deionized water is 4.0 μS / cm, and the chloride ion concentration is 30 mg / L.

[0154] Preparation method: Same as in Example 1, according to the weight proportions of this example. Before construction, adjust according to the clay geology adaptation parameters: grouting pressure 0.8~1.0 MPa, grouting speed 20 L / min.

[0155] Performance testing: Tested according to JIS A1218 standard, the permeability coefficient is consistently 3.5×10⁻⁶. -7 m / s, 28-day compressive strength 6.1 MPa.

[0156] Example 13 Components: 52 parts of main curing substrate, 14 parts of water permeability control system, 9 parts of active activating component, 2.8 parts of rheology stabilizing component, 1.6 parts of environmentally friendly retarding component, and 30.6 parts of deionized water.

[0157] Specific components: Permeability control system: porosity 50%; lignin fiber length 4.5mm; modified bentonite expansion rate 215%; sodium citrate addition 1.4%.

[0158] The remaining components are the same as in Example 2.

[0159] The conductivity of deionized water is 3.8 μS / cm, and the chloride ion concentration is 25 mg / L.

[0160] Preparation method: Same as in Example 1, according to the weight proportions of this example. Construction parameters: Grouting pressure 1.0~1.2MPa, grouting speed 25 L / min.

[0161] Performance test: Permeability coefficient 8.2×10 -6 m / s, 28-day compressive strength 7.0 MPa, permeability coefficient fluctuation ≤±12%.

[0162] Example 14 Components: 54 parts of main curing substrate, 17 parts of water permeability control system, 8 parts of active activating component, 2.5 parts of rheology stabilizing component, 2.1 parts of environmentally friendly retarding component, and 28.4 parts of deionized water.

[0163] Specific components: Permeability control system: porosity 55%; lignin fiber length 5.5mm; modified bentonite expansion rate 265%; sodium citrate addition 1.3%.

[0164] The remaining components are the same as in Example 5.

[0165] The conductivity of deionized water is 3.0 μS / cm, and the chloride ion concentration is 18 mg / L.

[0166] Preparation method: Same as in Example 1, according to the weight proportions of this example. Construction parameters: Grouting pressure 1.2~1.5MPa, grouting speed 30 L / min.

[0167] Performance test: Permeability coefficient 2.8×10 -5 m / s, 28-day compressive strength 7.4 MPa.

[0168] Conclusion: The grouting material of this invention exhibits a stable 28-day compressive strength of 5.8–7.5 MPa under different component ratios, and its permeability coefficient can be precisely controlled to 3.2 × 10⁻⁶ MPa. -6 ~ 4.5×10 -5 With a flow rate of m / s, a fluidity of 225 mm ~ 251 mm, an initial setting time of 3.2 ~ 5.8 h, and a final setting time of 4.8 ~ 8.2 h, its various properties are adaptable to different geological conditions. It has stable curing strength, precise permeability control, and good construction adaptability, and can meet the needs of complex cavity filling and foundation reinforcement.

[0169] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A controllable permeable curing grouting material, characterized in that, By weight, it includes: 45-55 parts of the primary curing substrate; Permeability control system: 8-18 parts; 25-35.9 parts deionized water; The permeability control system comprises: porous volcanic rock powder, lignin fiber, and modified bentonite, wherein the mass ratio of the porous volcanic rock powder, lignin fiber, and modified bentonite is 50:35:15; the porosity of the porous volcanic rock powder is 45% to 55%, the length of the lignin fiber is 3 mm to 6 mm, and the expansion rate of the modified bentonite is 150% to 280%.

2. The controllable permeable curing grouting material according to claim 1, characterized in that, The lignin fiber is extracted from natural cork, with a moisture content of ≤8%, ash content of ≤5%, and fiber diameter of 20μm ~ 50μm; the modified bentonite is sodium-based bentonite modified with sodium citrate, and the amount of sodium citrate added is 1.2% ~ 1.5% of the mass of sodium-based bentonite.

3. The controllable permeable curing grouting material according to claim 1 or 2, characterized in that, The conductivity of the deionized water is ≤5μS / cm, and its chloride ion content is ≤50mg.

4. The controllable permeable curing grouting material according to claim 3, characterized in that, The main solidification substrate includes modified slag powder, ultrafine fly ash and calcined kaolin, and the mass ratio of the slag powder, ultrafine fly ash and calcined kaolin is 65:25:

10. The modified slag powder has a specific surface area of ​​4200 cm². 2 / g ~ 4800cm 2 / g, activity index ≥92, free calcium oxide content ≤1.5%; in the calcined kaolin, the active silica mass percentage content ≥45%, and the aluminum oxide mass percentage content ≥38%.

5. The controllable permeable curing grouting material according to claim 1, characterized in that, The controllable permeable curing grouting material also includes the following components, in parts by weight: 5 to 12 parts of the active activating component; Rheologically stable component: 1.5 ~ 3.5 parts; Environmentally friendly retarding component: 0.8 ~ 2.2 parts.

6. The controllable permeable curing grouting material according to claim 5, characterized in that, The active activating component includes a composite alkali activator, nano silica, and gypsum whiskers, and the mass ratio of the composite alkali activator, nano silica, and gypsum whiskers is 70:20:

10. The rheology stabilizing component includes anionic polyacrylamide, hydroxyethyl cellulose, and polycarboxylate superplasticizer, wherein the mass ratio of the anionic polyacrylamide, hydroxyethyl cellulose, and polycarboxylate superplasticizer is 45:35:

20. The environmentally friendly retarding component includes sodium gluconate, citric acid, and sodium lignosulfonate, wherein the mass ratio of sodium gluconate, citric acid, and sodium lignosulfonate is 55:30:

15.

7. The controllable permeable curing grouting material according to claim 6, characterized in that, The composite alkali activator is a mixture of calcium hydroxide and sodium carbonate, with a mass ratio of calcium hydroxide to sodium carbonate of 4:

1.

8. A method for preparing the controllable permeable curing grouting material according to any one of claims 1 to 7, characterized in that, Includes the following steps: The raw materials for the main curing substrate and the raw materials for the water permeability control system were pretreated separately; The permeability control system includes porous volcanic rock powder, lignin fiber, and modified bentonite; The main curing substrate and water permeability control system after dry mixing pretreatment according to the specified ratio; After hydration, stirring, and maturation, a controllable permeable curing grouting material is obtained.

9. The preparation method according to claim 8, characterized in that, The method for preparing the porous volcanic rock powder is as follows: the surface of the pretreated basaltic volcanic rock is modified by using a diluted silane coupling agent, wherein the amount of the diluted silane coupling agent used is 0.5% to 1.0% of the mass of the pretreated basaltic volcanic rock, and the porous volcanic rock powder is obtained by drying.

10. The application of the controllable permeable curing grouting material according to any one of claims 1 to 7 in the filling, reinforcement, and seepage prevention construction of complex geological types, characterized in that, The complex geological types include one or more of clay, fine sand, and gravel. Before the filling, reinforcement, and seepage prevention construction, the target permeability coefficient is determined through geological survey, and the permeability control system is adjusted according to the following process parameters based on the geological type: Clay geology: The permeability control system is added at a dosage of 8-12 parts by weight, using 3mm-4mm lignin fibers, with the expansion rate of modified bentonite controlled at 150%-180%, and the porosity of porous volcanic rock powder at 45%, so that the target permeability coefficient is stabilized at 1×10⁻⁶. -7 ~5×10 -6 m / s; Fine sand geology: The permeability control system is added at a dosage of 12-15 parts by weight, using 4mm-5mm lignin fibers, modified bentonite with an expansion rate of 200%-230%, and porous volcanic rock powder with a porosity of 50%, so as to stabilize the target permeability coefficient at 5×10⁻⁶. -6 ~ 1×10 -5 m / s; Gravel geology: The permeability control system is added at a dosage of 15-18 parts by weight, using 5mm-6mm lignin fibers, modified bentonite with an expansion rate of 250%-280%, and porous volcanic rock powder with a porosity of 55%, so as to stabilize the target permeability coefficient at 1×10⁻⁶. -5 ~ 5×10 -4 m / s.