A reinforcement and treatment structure for the seepage prevention transition section of an irregular rock slope in a mine landfill.

Abstract

This invention discloses a reinforcement and treatment structure for the seepage prevention transition section of an irregular rock slope in a mine landfill. The reinforcement and treatment structure includes a seepage prevention cementitious composite sprayed filler layer (2) formed by wet spraying seepage prevention cementitious composite sprayed filler on the surface of the seepage prevention transition section, a seepage prevention geomembrane (3) laid on the surface of the seepage prevention cementitious composite sprayed filler layer (2), a rubber pad (7) laid on the surface of the seepage prevention geomembrane (3), and a thin steel plate (6) laid on the surface of the rubber pad (7). The seepage prevention cementitious composite sprayed filler has the following composition: 20% to 25% solidified cementitious material, 55% to 61% tailings sand, and 18% to 21% water. This invention is applied to the reinforcement of the seepage prevention transition section of an irregular rock slope in a mine landfill, overcoming the problem of easy damage during the fixing process of the seepage prevention transition section of an irregular rock slope, eliminating potential hidden dangers, and improving the safety and reliability of the seepage prevention system. It not only has good economic benefits, but also significant safety and environmental benefits.

Description

Technical Field

[0001] This invention belongs to the field of mine pit slope seepage prevention and reinforcement technology, specifically relating to a reinforcement and treatment structure for the seepage prevention transition section of irregular rock slopes in mine pit landfills, which is particularly suitable for application in slope seepage prevention and reinforcement projects using abandoned mine pits as solid waste landfills. Background Technology

[0002] Currently, using abandoned mine pits as solid waste landfill sites not only solves the ecological restoration problem of abandoned mine pits, but also provides a new approach to the site selection of solid waste landfills, alleviating the current scarcity of land resources for industrial solid waste landfills. Given the large area required for solid waste landfills and the difficulty in finding suitable sites, site selection has become one of the key concerns in solid waste treatment, leading to the emergence of the idea of ​​using abandoned mine pits as solid waste landfill sites.

[0003] As solid waste landfills, abandoned mine pits present many technical challenges in their construction and operation. Among these challenges, the seepage prevention and pollution control technologies for the pit bottom and slopes are critical issues that urgently need to be addressed. Leachate seeps through fractured rock and soil, directly affecting the surrounding soil and groundwater, which in turn impacts drinking water, surface water irrigation, and aquaculture in the surrounding area.

[0004] The mine pit seepage prevention system consists of two parts: base seepage prevention and slope seepage prevention. The main function of the seepage prevention system is to prevent leachate from seeping in and avoid secondary pollution. Its role in protecting the overall ecological environment of the mine pit and its surroundings cannot be ignored.

[0005] Mine pit seepage prevention systems often use geomembranes as the seepage lining, with protective layers installed above and below according to the slope's undulation. Base seepage prevention can effectively address the issue of base flatness through site preparation, ensuring the safety and reliability of the geomembrane installation. However, due to previous mining activities, slopes often exhibit irregular shapes with significant undulations. Directly laying the geomembrane on these irregular slopes creates stress concentration areas, and the lateral pressure from accumulated solid waste during landfill operation causes seepage damage, which is highly concealed and incurs high repair costs.

[0006] Currently, various new types of seepage-proof materials are being used for seepage prevention on mine pit slopes. For example, new cementitious materials, used in conjunction with geomembranes, have solved the problems of high difficulty and low reliability in seepage prevention on irregular rock slopes. To prevent leachate from landfills from polluting groundwater, seepage-proof materials need to be laid in a specific structure on the bottom and slopes of the landfill to form a seepage-proof layer. In related technologies, the seepage-proof layer mainly uses high-density polyethylene (HDPE) membranes to block leachate from seeping into the ecological environment. Depending on the actual engineering situation, single-layer or multi-layer HDPE membranes can be used. When laying HDPE membranes on slopes, the joint direction should be parallel to the slope surface. Horizontal joints are not allowed on the slope to avoid stress concentration at the weld points due to sliding forces, which could pull on the joints and lead to seepage points.

[0007] Chinese Patent 202223090706.0 discloses a landfill slope seepage prevention structure, which includes, from bottom to top, a foundation layer, a cushion layer, a seepage prevention layer, a protective layer, and a sandbag layer. The seepage prevention layer includes a first HDPE membrane, a second HDPE membrane, and a water-absorbing component. Two welding strips are welded at the overlap of the first and second HDPE membranes. The first HDPE membrane, the second HDPE membrane, and the two welding strips form a through groove, and the water-absorbing component is disposed within the through groove. The water-absorbing component contains a reagent for detecting moisture. By adopting the above technical solution, the welding strips at the joint of the first and second HDPE membranes give the seepage prevention layer greater shear and tensile strength at the joint, reducing stress concentration at the welding strips due to sliding force and preventing the creation of new seepage points. Simultaneously, the two welding strips also provide a dual seepage prevention effect. However, this landfill slope seepage prevention structure also suffers from high construction costs, making it difficult to apply on a large scale in industry, especially unsuitable for seepage prevention on irregular rock slopes in mine landfills. Chinese patent application 202411113707.3 discloses a seepage prevention system for steep slopes in mine pits based on polymeric mineral seepage prevention materials, which uses an outer geocell filled with polymeric mineral seepage prevention materials and an inner geocell filled with graded pebbles. Chinese patent with publication number CN112523264A uses a wire mesh shotcrete technique to level and passivate the slope base before laying, which has problems such as high construction cost, high difficulty, and large hidden dangers of the shotcrete layer. Chinese patent with publication number CN217782093U requires slope treatment to improve the anti-slip stability of the protective structure and the seepage prevention membrane, which has problems such as complex construction technology, high excavation difficulty, and slope disturbance and instability.

[0008] The method of fixing the seepage prevention transition section is very important to the safety and reliability of the landfill seepage prevention system. To date, there is no unified standard for the method of fixing the transition section, and the single steel bar slope fixing method is often used. This method is prone to damage to the seepage prevention body of the transition section and has significant potential hidden dangers. Summary of the Invention

[0009] The purpose of this invention is to address the technical challenges of current methods for fixing seepage transition sections, such as high construction difficulty, high construction cost, easy damage to the seepage prevention body of the transition section, and potential hidden risks. It provides a reinforcement and treatment structure for seepage transition sections on irregular rock slopes in mine landfills that is convenient to construct, economical, effective, safe and reliable.

[0010] To achieve the above-mentioned objectives of this invention, the present invention provides a reinforcement and treatment structure for the seepage prevention transition section of an irregular rock slope in a mine landfill, employing the following technical solution:

[0011] This invention discloses a reinforcement and treatment structure for an irregular rock slope seepage prevention transition section in a mine landfill. The seepage prevention transition section is divided by a seepage prevention boundary line, with one side of the boundary line being an irregular rock slope and the other side being a regular rock slope. The structure comprises: a seepage prevention gel-composite sprayed filler layer formed by wet spraying seepage prevention gel-composite sprayed filler onto the surface of the seepage prevention transition section; a seepage prevention geomembrane laid on the surface of the seepage prevention gel-composite sprayed filler layer; a rubber mat laid on the surface of the seepage prevention geomembrane; and a thin steel plate laid on the surface of the rubber mat. The seepage prevention gel-composite sprayed filler layer is uniformly straight on the surface of the irregular rock slope and extends L1 length on the regular rock slope. The thickness of the wet-sprayed seepage prevention gel-composite sprayed filler layer on the regular rock slope transitions uniformly. Up to 0; the impermeable geomembrane laid on the regular rock slope extends along the impermeable boundary to the irregular rock slope for a length of L2, and the impermeable cementitious composite sprayed filler layer and the bidirectional extension section of the impermeable geomembrane form an overlap section; according to the designed hole diameter and spacing, holes are drilled in the rubber pad and thin steel plate respectively, and the drilling positions on the rubber pad and thin steel plate correspond; the hollow grouting anchor rod is self-drilled from the drill holes in the thin steel plate and rubber pad, and penetrates into the rock in the impermeable cementitious composite sprayed filler layer, with a rock inclination angle of α and a rock penetration depth of La; after the hollow grouting anchor rod is fixed, the excess part of the extended section of the impermeable geomembrane is cut off, and the gaps between the thin steel plate, rubber pad, impermeable geomembrane and impermeable cementitious composite sprayed filler layer are filled and bonded with an impermeable sealing agent, and the impermeable sealing agent is evenly applied along the perimeter of the thin steel plate;

[0012] When the total mass of the anti-seepage cementitious composite spray filler is 100%, the proportions of each component are as follows: 20% to 25% of the cured cementitious material, 55% to 61% of the tailings sand, and 18% to 21% of the water; the tailings sand contains more than 85% of particles with a mass of 0.5mm to 0.25mm size.

[0013] The cured cementitious material is composed of a stabilizer, composite powder, water glass, and cement. The total mass percentage of each component is as follows: stabilizer 11%~14%, composite powder 11%~14%, water glass 30%~42%, and cement 29%~45%. The stabilizer contains 50%~60% calcium chloride and 40%~50% sodium borate tetrahydrate by mass percentage. The composite powder is composed of calcium carbide slag powder, desulfurized gypsum, fly ash, and blast furnace slag, with the following mass percentage composition: calcium carbide slag powder 30%~35%, desulfurized gypsum 16%~20%, fly ash 20%~24%, and blast furnace slag 21%~26%.

[0014] Preferably, the particle size of the composite powder is such that more than 90% of the particles are less than 35 μm in size.

[0015] Preferably, the thickness of the seepage-proof cementitious composite spray filler layer (2) formed by wet spraying on irregular rock slopes is δ=5cm~15cm, and the wet spraying length on regular rock slopes is L1=1.0m~2.0m.

[0016] Preferably, the impermeable geomembrane to be laid is an HDPE geomembrane with a specification of 1.5mm~2.0mm and an extended laying length L2=0.8m~1.5m.

[0017] Preferably, when the total mass of the anti-seepage cementitious composite spray filler is 100%, the proportions of each component are as follows: 21%–23% of the cured cementitious material, 57%–60% of the tailings sand, and 19%–21% of the water; when the total mass of the cured cementitious material is 100%, the content of each component is as follows: 12%–14% of the stabilizer, 12%–14% of the composite powder, 33%–39% of the water glass, and 33%–39% of the cement; the stabilizer is composed of 54%–57% calcium chloride and 43%–46% sodium borate tetrahydrate by mass percentage.

[0018] Preferably, the hollow grouting anchor rod is a full-length corrugated thread, equipped with a fixing nut and a special quick grouting joint. The specification of the hollow grouting anchor rod is R20~25, the drilling depth into the rock is La=50cm~1.5m, the plane spacing of the drill holes along the axial direction is M=30cm~50cm, and the rock inclination angle of the hollow grouting anchor rod is α=15°~25°.

[0019] Preferably, the nut is matched with the specifications and dimensions of the hollow grouting anchor rod, and the nut specification and model are M16~M20.

[0020] Preferably, the thin steel plate is a steel plate with a thickness of less than 3mm, a size of 2mm~3mm, a width B=30cm~50cm, an axial length L3=1~2m, and pre-drilled holes on the surface. The hole diameter matches the specifications of the hollow grouting anchor rod, the hole spacing M2=30cm~50cm, and a rubber pad is placed inside. The rubber pad is a high-pressure resistant rubber pad with a thickness of 3mm~5mm.

[0021] Preferably, the seepage-proofing and leak-stopping agent is an inorganic waterproof and leak-stopping material, with the code FD Ⅱ GB 23440-2009.

[0022] The reinforcement and treatment structure for the seepage prevention transition section of irregular rock slopes in mine landfills, as described in this invention, exhibits the following positive effects after adopting the above technical solution:

[0023] (1) The present invention improves the stability of the transition section fixing structure by forming an overlapping section through the bidirectional extension of the new impermeable geomembrane cementitious material, and has the advantages of strong operability and reliable construction.

[0024] (2) The present invention utilizes the anchoring stability of the hollow grouting anchor rod and the padding effect of the high pressure resistant rubber pad to form a fixed structure with good air tightness, thereby improving the safety and stability of the seepage prevention transition section.

[0025] (3) The impermeable cementitious composite spray filler developed in this invention fully utilizes the chemical properties of fine-grained minerals in tailings sand. Under the action of added compounds, it forms a water-impermeable polymeric gel through physical and chemical reactions. This polymer does not react chemically with acids, alkalis, or other salts, and has good workability and extremely low permeability, only 1 / 3000 that of high-quality clay. The permeability coefficient can reach k=0.3×10 -9 .

[0026] (4) The anti-seepage cementitious composite spray filler developed in this invention has good acid and alkali resistance, strong stability, high consolidation strength, is easy to construct and lay, has high spraying efficiency, and does not require compaction.

[0027] (5) The anti-seepage gelling composite spray filler developed in this invention effectively endows the slurry with good coagulation characteristics and mechanical properties, and the 28-day strength is greater than 20MPa.

[0028] (6) The composite powder and tailings sand used in the solidified cementitious material developed in this invention are all industrial solid wastes. They do not require secondary calcination. The production process is simple, environmentally friendly, and requires less investment, which reduces the carbon emissions and energy consumption of traditional cementitious material clinker calcination.

[0029] This invention is applied to the reinforcement of the seepage prevention transition section of irregular rock slopes in mine landfills, overcoming the problem of easy damage during the fixing process of the seepage prevention transition section of irregular rock slopes. It not only has good economic benefits, but also significant safety and environmental benefits. Attached Figure Description

[0030] Figure 1 This is a plan view of a reinforcement and treatment structure for an irregular rock slope seepage prevention transition section in a mine landfill, according to the present invention.

[0031] Figure 2 This invention relates to a cross-sectional view of a reinforcement and treatment structure for an irregular rock slope seepage prevention transition section in a mine landfill.

[0032] Figure labels: 1-1—Regular rock slope; 1-2—Irregular rock slope; 2—Impering cementitious composite sprayed filler layer; 3—Impering geomembrane; 4—Hollow grouting anchor; 5—Nut; 6—Thin steel plate; 7—Rubber pad; 8—Impering and plugging agent; 9—Impering boundary. Detailed Implementation

[0033] To better describe the present invention, the following detailed description, in conjunction with the accompanying drawings, provides a reinforcement and treatment structure for an irregular rock slope seepage prevention transition section in a mine landfill.

[0034] In the embodiment, after the solid waste landfill in an abandoned mine pit was filled to a relative elevation of 15m, the area of ​​the irregular rock slope surface accounted for about 20%. A new type of impermeable cementitious material and HDPE geomembrane were used for combined impermeability. The transition section between the two impermeable materials was fixed by a single steel bar slope. During operation, the impermeable membrane in the transition section was damaged, and effective engineering measures were urgently needed for treatment or remediation.

[0035] Depend on Figure 2 The diagram shown is a cross-sectional view of a reinforcement and treatment structure for an irregular rock slope seepage prevention transition section in a mine landfill, according to the present invention, and is combined with... Figure 1 It can be seen that the seepage prevention transition section is divided by the seepage prevention boundary line 9. One side of the seepage prevention boundary line 9 is an irregular rock slope 1-2, and the other side of the seepage prevention boundary line 9 is a regular rock slope 1-1. In this embodiment, the reinforcement and treatment structure for the seepage prevention transition section of an irregular rock slope in a mine landfill according to the present invention is implemented through the following steps:

[0036] S1 seepage-proof gelled composite spray filler preparation

[0037] According to the "Standard for Pollution Control of General Industrial Solid Waste Storage and Landfill" (GB According to 18599-2020, a seepage-proof cementitious composite spray filler is prepared by mixing solidified cementitious material, tailings sand, and water. When the total mass of the seepage-proof cementitious composite spray filler is 100%, the proportion of each component is: solidified cementitious material 22%, tailings sand 59%, and water 19%; the tailings sand contains more than 85% of particles with a mass size of 0.5mm~0.25mm; the solidified cementitious material is composed of stabilizer, composite powder, water glass, and cement, and the content of each component when the total mass is calculated as 100% is: stabilizer 12%, composite powder 13%, water glass 36%, and cement 39%; the stabilizer contains 55% calcium chloride and 45% sodium borate tetrahydrate by mass percentage; the composite powder is composed of calcium carbide slag powder, desulfurized gypsum, fly ash, and blast furnace slag, and the proportion of calcium carbide slag powder 32%, desulfurized gypsum 18%, fly ash 24%, and blast furnace slag 26% by mass percentage. The composite powder has a particle size of less than 35 μm, with more than 90% of the particles being of this size.

[0038] S2 anti-seepage gelling composite spray filler wet spraying

[0039] The impermeable cementitious composite spray filler prepared in step S1 is wet-sprayed onto the irregular rock slope, and then wet-sprayed to a length of L1=1.5m on the regular rock slope 1-1 on the other side of the impermeable boundary 9, thereby forming an impermeable cementitious composite spray filler layer 2 on the surface of the impermeable transition section; the surface of the impermeable cementitious composite spray filler layer 2 sprayed on the irregular rock slope 1-2 is uniformly flat, uniformly covered and has an average thickness δ=5cm, and the thickness of the impermeable cementitious composite spray filler layer 2 sprayed in the L1 length section transitions uniformly from 5cm to 0cm.

[0040] S3 impermeable geomembrane laying

[0041] According to the "Standard for Pollution Control of Storage and Landfill of General Industrial Solid Waste" (GB 18599-2020), a 1.5mm HDPE geomembrane 3 with the specified seepage prevention effect is laid from the regular rock slope 1-1, and a length of L2=1.0m is extended along the seepage prevention boundary line 9 to the irregular rock slope 1-2. The seepage prevention cementitious composite sprayed filler layer 2 and the seepage prevention geomembrane 3 form an overlapping section in both directions.

[0042] S4 rubber pads, thin steel plate laying and fixing

[0043] Pre-drilling holes are made on the surface of the thin steel plate 6 according to the diameter of the hollow grouting anchor rod 4. The thin steel plate 6 is a steel plate with a thickness of 2mm to 3mm and a width of B=30cm. The axial length L3=1.5m, and the pre-drilled holes are arranged at equal intervals along the axial direction with a spacing of M2=30cm. The rubber pad 7 is a high-pressure resistant rubber pad with a thickness of 3mm. Its width, axial length, and hole diameter are arranged in the same manner as the thin steel plate 6. Rubber pads 7 and thin steel plates 6 are laid on the impermeable geomembrane 3 from the inside out, with corresponding drill holes on the rubber pads 7 and thin steel plates 6. The hollow grouting anchor rods 4 are R20 in size. The hollow grouting anchor rods 4 are drilled into the rock inside the impermeable cementitious composite sprayed filler layer 2 by self-drilling through the drill holes in the thin steel plates 6 and rubber pads 7. The rock inclination angle is α=20°, the rock depth is La=50cm, and the plane spacing is M=30cm, which is the same as the hole diameter spacing M. After entering the rock, grout is injected from the bottom, and grout returns from the hole opening. M16 nuts 5 are used for fixing.

[0044] S5 Leak-proofing and sealing agent trimming

[0045] After the hollow grouting anchor 4 is fixed, the excess portion of the extended section of the geomembrane 3 is cut off, leaving a 30cm gap. The gaps between the thin steel plate 6, rubber gasket 7, geomembrane 3, and the geotextile composite sprayed filler layer 2 are filled and bonded using a waterproofing and sealing agent 8. The waterproofing and sealing agent 8 is then evenly applied around the perimeter of the thin steel plate 6 to further improve sealing. The waterproofing and sealing agent 8 is a quick-setting type, designated FD Ⅱ GB 23440-2009, selected based on the setting time.

[0046] The test and inspection results show that the reinforcement and treatment structure for the seepage prevention transition section of the irregular rock slope in a mine landfill, as described in this invention, is applicable to the reinforcement of the seepage prevention transition section of the irregular rock slope in a mine landfill. The structure, consisting of a seepage-proof cementitious composite sprayed filler layer 2, a seepage-proof geomembrane 3 laid on the surface of the seepage-proof cementitious composite sprayed filler layer 2, a rubber pad 7 laid on the surface of the seepage-proof geomembrane 3, and a thin steel plate 6 laid on the surface of the rubber pad 7, exhibits extremely low permeability, only 1 / 3000 that of high-quality clay, with a permeability coefficient reaching k=0.3×10⁻⁶. -9 Moreover, it is sturdy and reliable, completely solving the problem of easy damage during the fixing process of the seepage prevention transition section on regular rock slopes.

[0047] The above are preferred embodiments implemented on-site. This invention also conducted experimental studies on the upper and lower limits of relevant components and other intermediate proportions in the anti-seepage cementitious composite spray filler, with a permeability coefficient ranging from (0.25 to 0.5) × 10⁻⁶. -9 In between, I will not list them all again.

Claims

1. A reinforcement and treatment structure for an irregular rock slope seepage prevention transition section in a mine landfill, wherein the seepage prevention transition section is divided by a seepage prevention boundary (9), with one side of the seepage prevention boundary (9) being an irregular rock slope (1-2) and the other side of the seepage prevention boundary (9) being a regular rock slope (1-1), characterized in that: The reinforcement structure of the seepage-proof transition section includes a seepage-proof gel-coated composite sprayed filler layer (2) formed by wet spraying seepage-proof gel-coated composite sprayed filler on the surface of the seepage-proof transition section, a seepage-proof geomembrane (3) laid on the surface of the seepage-proof gel-coated composite sprayed filler layer (2), a rubber pad (7) laid on the surface of the seepage-proof geomembrane (3), and a thin steel plate (6) laid on the surface of the rubber pad (7); the seepage-proof gel-coated composite sprayed filler layer (2) is uniformly straight on the surface of the irregular rock slope (1-2) and extends L1 length on the regular rock slope (1-1), and the thickness of the seepage-proof gel-coated composite sprayed filler layer (2) formed by wet spraying on the regular rock slope (1-1) transitions uniformly until 0; the seepage-proof geomembrane (3) laid from the regular rock slope (1-1) extends L2 length along the seepage-proof boundary line (9) towards the irregular rock slope (1-2) to prevent seepage. The cementitious composite sprayed filler layer (2) and the two-way extension section of the impermeable geomembrane (3) form an overlapping section; according to the designed hole diameter and spacing, holes are drilled in the rubber pad (7) and the thin steel plate (6), and the drilling positions on the rubber pad (7) and the thin steel plate (6) correspond; the hollow grouting anchor rod (4) is drilled from the holes in the thin steel plate (6) and the rubber pad (7) and penetrates into the rock in the impermeable cementitious composite sprayed filler layer (2), with an inclination angle of α and a penetration depth of La; after the hollow grouting anchor rod (4) is fixed, the excess part of the extension section of the impermeable geomembrane (3) is cut off, and the gap between the thin steel plate (6), the rubber pad (7), the impermeable geomembrane (3) and the impermeable cementitious composite sprayed filler layer (2) is filled and bonded with an impermeable sealant (8), and the impermeable sealant (8) is evenly applied around the thin steel plate (6); The thickness of the impermeable gel-coated composite spray filler layer (2) formed by wet spraying on the irregular rock slope (1-2) is δ=5cm~15cm, and the wet spraying length on the regular rock slope (1-1) is L1=1.0m~2.0m; the impermeable geomembrane (3) is an HDPE geomembrane with a specification of 1.5mm~2.0mm, and the extended laying length is L2=0.8m~1.5m; the hollow grouting anchor (4) is a full-length corrugated thread, equipped with a fixing nut (5) and a special quick grouting joint. The specification of the hollow grouting anchor (4) is R20~25, the drilling depth into the rock is La=50cm~1.5m, the plane spacing of the boreholes along the axial direction is M=30cm~50cm, and the rock inclination angle of the hollow grouting anchor (4) is α=15°~25°; When the total mass of the anti-seepage cementitious composite spray filler is 100%, the proportions of each component are as follows: 20% to 25% of the cured cementitious material, 55% to 61% of the tailings sand, and 18% to 21% of the water; the tailings sand contains more than 85% of particles with a mass of 0.5mm to 0.25mm size. The cured cementitious material is composed of a stabilizer, composite powder, water glass, and cement. The total mass percentage of each component is as follows: stabilizer 11%~14%, composite powder 11%~14%, water glass 30%~42%, and cement 33%~45%. The stabilizer contains 50%~60% calcium chloride and 40%~50% sodium borate tetrahydrate by mass percentage. The composite powder is composed of calcium carbide slag powder, desulfurized gypsum, fly ash, and blast furnace slag, with the following mass percentage composition: calcium carbide slag powder 30%~35%, desulfurized gypsum 16%~20%, fly ash 20%~24%, and blast furnace slag 21%~26%.

2. The reinforcement and treatment structure for the seepage prevention transition section of an irregular rock slope in a mine landfill as described in claim 1, characterized in that: The composite powder has a particle size of less than 35 μm, with more than 90% of the particles being of this size.

3. The reinforcement and treatment structure for the seepage prevention transition section of an irregular rock slope in a mine landfill as described in claim 1 or 2, characterized in that: When the total mass of the aforementioned anti-seepage cementitious composite spray filler is 100%, the proportions of each component are as follows: 21%–23% cured cementitious material, 57%–60% tailings sand, and 19%–21% water; when the total mass of the aforementioned cured cementitious material is 100%, the content of each component is as follows: 12%–14% stabilizer, 12%–14% composite powder, 33%–39% water glass, and 33%–39% cement; the stabilizer, by mass percentage, is 54%–57% calcium chloride and 43%–46% sodium borate tetrahydrate.

4. The reinforcement and treatment structure for the seepage prevention transition section of an irregular rock slope in a mine landfill as described in claim 3, characterized in that: The nut (5) is matched with the hollow grouting anchor rod (4) in terms of specifications and dimensions. The nut (5) has a specification and model of M16~M20.

5. The reinforcement and treatment structure for the seepage prevention transition section of an irregular rock slope in a mine landfill as described in claim 4, characterized in that: The thin steel plate (6) has a thickness of 2mm~3mm, a width of B=30cm~50cm, an axial length of L3=1~2m, and pre-drilled holes on its surface. The hole diameter matches the specifications of the hollow grouting anchor rod (4), and the hole spacing M2=30cm~50cm. It is lined with a rubber pad (7). The rubber pad (7) is a high-pressure resistant rubber pad with a thickness of 3mm~5mm.

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