Fixing structure of irregular rock slope anti-seepage transition section of pit solid waste landfill

Abstract

The utility model discloses a fixing structure of an irregular rock slope anti-seepage transition section of a pit solid waste landfill. The reinforcing treatment structure of the anti-seepage transition section is formed by combining an anti-seepage gelling composite spraying filler layer (2) formed by wet spraying of anti-seepage gelling composite spraying filler on the surface of the anti-seepage transition section, an anti-seepage geomembrane (3) laid on the surface of the anti-seepage gelling composite spraying filler layer (2), a rubber pad (7) laid on the surface of the anti-seepage geomembrane (3) and a thin steel plate (6) laid on the surface of the rubber pad (7). The novel anti-seepage gelation of the anti-seepage geomembrane extends in two directions to form the lap joint section, the stability of the transition section fixing structure is improved, the fixing structure with good air tightness is formed through the anchoring stability of the hollow grouting anchor rod and the liner effect of the high-pressure-resistant rubber pad, the safety stability of the anti-seepage transition section is improved, potential hazards are eliminated, and the service life of the anti-seepage transition section is prolonged. And the safety and reliability of the anti-seepage system are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of mine pit slope seepage prevention and reinforcement, and particularly relates to a fixing structure for irregular rock slope surface seepage prevention transition section of mine pit solid waste landfill. BACKGROUND

[0002] The mine pit seepage prevention system is composed of two parts of base seepage prevention and slope surface seepage prevention. The main function of the seepage prevention system is to isolate leachate infiltration and avoid secondary pollution, and the effect of protecting the overall ecological environment of the mine pit and the surrounding area cannot be ignored.

[0003] The mine pit seepage prevention system mainly uses seepage prevention geomembrane as a seepage prevention lining, and a protective layer is arranged according to the ups and downs of the slope surface. The base seepage prevention can effectively solve the problem of base flatness through site modification, and ensure the safety and reliability of the seepage prevention geomembrane laying. However, due to the pre-mining activities, the slope surface is often irregular in shape with large ups and downs, and the direct laying of the seepage prevention geomembrane forms a stress concentration area due to the irregular slope surface. The lateral pressure formed by the accumulated solid waste during the operation of the landfill causes seepage prevention damage, and the seepage prevention damage has high concealment and high repair cost.

[0004] At present, various new seepage prevention materials are applied to mine pit slope seepage prevention, such as new cementing materials, which are used in combination with seepage prevention geomembrane to solve the problems of large difficulty in irregular rock slope surface seepage prevention and low reliability. The fixing method of the seepage prevention transition section is very important for the safety and reliability of the landfill seepage prevention system. There is no unified standard for the fixing method of the transition section, and a single steel slope surface fixing method is often used. This method is easy to cause damage to the seepage prevention body of the transition section, and has great potential risks. SUMMARY

[0005] The utility model aims at the technical problems of great construction difficulty, high construction cost, easy damage to the seepage prevention body of the transition section and potential risks of the seepage prevention transition section fixing, and provides a fixing structure for irregular rock slope surface seepage prevention transition section of mine pit solid waste landfill, which is convenient, economical and effective, and safe and reliable.

[0006] To achieve the above purpose of the utility model, the fixing structure for irregular rock slope surface seepage prevention transition section of mine pit solid waste landfill adopts the following technical scheme:

[0007] The utility model relates to a kind of fixed structure of irregular rock slope surface anti-seepage transition section of mine solid waste landfill, the anti-seepage transition section is divided with anti-seepage boundary, one side of anti-seepage boundary is irregular rock slope surface, the other side of anti-seepage boundary is regular rock slope surface, the anti-seepage transition section is divided with anti-seepage boundary, one side of anti-seepage boundary is irregular rock slope surface, the other side of anti-seepage boundary is regular rock slope surface, its characteristics are: the fixed structure of anti-seepage transition section is formed by the anti-seepage cementitious composite spray filler layer of anti-seepage transition section surface wet spray anti-seepage cementitious composite spray filler, the anti-seepage geomembrane of anti-seepage cementitious composite spray filler layer surface laying, rubber pad of anti-seepage geomembrane surface laying, thin steel plate of rubber pad surface laying combination constitutes;The anti-seepage cementitious composite spray filler layer is even flat on the surface of irregular rock slope surface, and extend L1 length on regular rock slope surface, the thickness of anti-seepage cementitious composite spray filler layer formed by wet spray on regular rock slope surface is evenly transitioned until 0;Anti-seepage geomembrane laid from regular rock slope surface extends L2 length along anti-seepage boundary and lays on irregular rock slope surface, and anti-seepage cementitious composite spray filler layer and anti-seepage geomembrane bidirectional extension section form lap joint section;According to the aperture, spacing of design, respectively in rubber pad, thin steel plate drilling, the drilling position on rubber pad, thin steel plate corresponds;From the drilling of thin steel plate, rubber pad, hollow grouting anchor rod is self-drilling and is drilled into rock in anti-seepage cementitious composite spray filler layer, and rock inclination is α, and rock depth is La;The gap between thin steel plate, rubber pad, anti-seepage geomembrane and anti-seepage cementitious composite spray filler layer is filled and bonded using anti-seepage leak-stopper, and anti-seepage leak-stopper is evenly applied along the periphery of thin steel plate.

[0008] Preferably, the thickness δ of the anti-seepage cementitious composite spray filler layer formed by wet spray on the irregular rock slope surface is 5cm~15cm, and the wet spray length L1 on the regular rock slope surface is 1.0m~2.0m.

[0009] Preferably, the anti-seepage geomembrane laid is HDPE geomembrane with a specification of 1.5mm~2.0mm, and the extension laying length L2 is 0.8m~1.5m.

[0010] Preferably, the hollow grouting anchor rod is full-length wave thread, matched with fixed nut and special quick grouting joint, the specification model of the hollow grouting anchor rod is R20~25, the drilling rock depth La is 50cm~1.5m, the drilling plane spacing M along the axis direction is 30cm~50cm, and the rock inclination α of the hollow grouting anchor rod is 15°~25°.

[0011] Preferably, the nut is matched with the specification size of the hollow grouting anchor rod, and the specification model of the nut is M16~M20.

[0012] Preferably, the thin steel plate is a steel plate with a thickness less than 3mm, a size of 2mm-3mm, a width B=30cm-50cm, an axial length L3=1-2m, a surface pre-drilled hole processing, a hole diameter matched with the specification of the hollow grouting anchor rod, a hole spacing M2=30cm-50cm, and a rubber pad lining.

[0013] The fixing structure of the irregular rock slope surface anti-seepage transition section of the mine solid waste landfill has the following positive effects after adopting the above technical scheme:

[0014] (1) The fixing structure of the irregular rock slope surface anti-seepage transition section of the mine solid waste landfill has the advantages of strong operability and reliable construction.

[0015] (2) The fixing structure of the irregular rock slope surface anti-seepage transition section of the mine solid waste landfill has the advantages of strong operability and reliable construction.

[0016] (3) The fixing structure of the irregular rock slope surface anti-seepage transition section of the mine solid waste landfill has the advantages of strong operability and reliable construction. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The fixing structure of the irregular rock slope surface anti-seepage transition section of the mine solid waste landfill has the advantages of strong operability and reliable construction.

[0018] Figure 2 The fixing structure of the irregular rock slope surface anti-seepage transition section of the mine solid waste landfill has the advantages of strong operability and reliable construction.

[0019] Reference signs: 1-1 - regular rock slope surface; 1-2 - irregular rock slope surface; 2 - anti-seepage cemented composite sprayed filler layer; 3 - anti-seepage geomembrane; 4 - hollow grouting anchor rod; 5 - nut; 6 - thin steel plate; 7 - rubber pad; 8 - anti-seepage leak-stopping agent; 9 - anti-seepage boundary. DETAILED DESCRIPTION

[0020] In order to better describe the fixing structure of the irregular rock slope surface anti-seepage transition section of the mine solid waste landfill, the fixing structure of the irregular rock slope surface anti-seepage transition section of the mine solid waste landfill will be further described in detail below.

[0021] 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.

[0022] Depend on Figure 2 The diagram shown is a cross-sectional view of a fixed structure for an anti-seepage transition section on an irregular rock slope in a mine solid waste landfill, in conjunction with the present invention. 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 the embodiment, in the fixed structure of the seepage prevention transition section of the irregular rock slope in the mine pit solid waste landfill of this utility model, 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. The fixed structure of the seepage prevention transition section is composed of a seepage prevention gel-coated composite spray filler layer 2 formed by wet spraying seepage prevention gel-coated composite spray filler on the surface of the seepage prevention transition section, a seepage prevention geomembrane 3 laid on the surface of the seepage prevention gel-coated composite spray 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 specific implementation steps are as follows:

[0023] S1 seepage-proof gelled composite spray filler preparation

[0024] 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.

[0025] S2 anti-seepage gelling composite spray filler wet spraying

[0026] The irregular rock slope surface is wet sprayed with the anti-seepage cementitious composite spray filler prepared in step S1, and the wet spraying L1=1.5 m in length is extended to the regular rock slope surface 1-1 on the other side of the anti-seepage boundary 9, so as to form an anti-seepage cementitious composite spray filler layer 2 on the surface of the anti-seepage transition section; the surface of the anti-seepage cementitious composite spray filler layer 2 sprayed on the irregular rock slope surface 1-2 is uniform and flat, uniformly covers and has an average thickness δ=5 cm, and the thickness of the anti-seepage cementitious composite spray filler layer 2 sprayed on the L1 length section is uniformly transitioned from 5 cm to 0.

[0027] S3 Anti-seepage geomembrane laying

[0028] According to the Standard for Pollution Control on General Industrial Solid Waste Storage and Landfill (GB 18599-2020), a 1.5 mm HDPE anti-seepage geomembrane 3 with a specified anti-seepage effect is laid on the regular rock slope surface 1-1, and is laid in extension along the anti-seepage boundary 9 to the irregular rock slope surface 1-2 for a length of L2=1.0 m, and the anti-seepage cementitious composite spray filler layer 2 and the anti-seepage geomembrane 3 form a lap section in the bidirectional extension section.

[0029] S4 Rubber pad, thin steel plate laying and fixing

[0030] According to the diameter of the hollow grouting anchor rod 4, a pre-drilling hole is processed on the surface of the thin steel plate 6, which is a steel plate with a thickness of 2 mm to 3 mm and a width B=30 cm. The axis length L3=1.5 m, the pre-drilling holes are arranged at equal intervals along the axis, and the interval M2=30 cm; the rubber pad 7 is a high-pressure-resistant rubber pad with a thickness of 3 mm, and the width, axis length and hole diameter are arranged in the same way as the thin steel plate 6. The rubber pad 7 and the thin steel plate 6 are laid on the anti-seepage geomembrane 3 from inside to outside, and the drilling positions on the rubber pad 7 and the thin steel plate 6 correspond; the specification of the hollow grouting anchor rod 4 is R20, the hollow grouting anchor rod 4 is drilled from the drilling holes of the thin steel plate 6 and the rubber pad 7, and is deeply inserted into the rock in the anti-seepage cementitious composite spray filler layer 2, the rock-inclination angle is α=20°, the rock-inclination depth is La=50 cm, the plane interval M=30 cm is the same as the hole diameter interval M, and after the rock-inclination, the grouting is performed from the bottom, and the hole mouth returns the grout, and the M16 type nut 5 is used for fixing.

[0031] S5 Anti-seepage leakage stopping agent trimming

[0032] After the hollow grouting anchor rod 4 is fixed, the excess part of the anti-seepage geomembrane 3 laid in extension is cut off, and 30 cm is reserved. The anti-seepage leakage stopping agent 8 is used to fill and bond the gaps between the thin steel plate 6, the rubber pad 7, the anti-seepage geomembrane 3 and the anti-seepage cementitious composite spray filler layer 2, and the anti-seepage leakage stopping agent 8 is uniformly applied along the periphery of the thin steel plate 6 to further improve the sealing performance. The anti-seepage leakage stopping agent 8 is selected according to the setting time, and the code is FD Ⅱ GB 23440-2009.

[0033] The utility model discloses a kind of fixing structure of irregular rock slope surface anti-seepage transition section of mine pit solid waste landfill, be applied to the reinforcement of irregular rock slope surface anti-seepage transition section of mine pit landfill, the reinforcement management structure of the anti-seepage transition section formed by anti-seepage cementitious composite spray filler layer 2, the anti-seepage geomembrane 3 laid on the surface of anti-seepage cementitious composite spray filler layer 2, the rubber pad 7 laid on the surface of anti-seepage geomembrane 3, the thin steel plate 6 laid on the surface of rubber pad 7, not only permeability is extremely low, only 1 / 3000 of high-quality clay, permeability coefficient can reach k=0.3×10 -9 -3, and firm and reliable, completely solve the problem of easy damage in the process of regular rock slope surface anti-seepage transition section fixation.

Claims

1. A fixed structure for preventing seepage of irregular rock slope surface in a mine solid waste landfill site, the seepage prevention transition section being divided by a seepage prevention boundary (9), one side of the seepage prevention boundary (9) being an irregular rock slope surface (1-2), and the other side of the seepage prevention boundary (9) being a regular rock slope surface (1-1), characterized in that: The fixing structure of the anti-seepage transition section is composed of an anti-seepage cement composite spray filler layer (2) formed by wet spraying the anti-seepage cement composite spray filler on the surface of the anti-seepage transition section, an anti-seepage geomembrane (3) laid on the surface of the anti-seepage cement composite spray filler layer (2), a rubber pad (7) laid on the surface of the anti-seepage geomembrane (3), and a thin steel plate (6) laid on the surface of the rubber pad (7); the anti-seepage cement composite spray filler layer (2) is even and flat on the surface of the irregular rock slope (1-2) and extends by a length L1 on the regular rock slope (1-1), the thickness of the anti-seepage cement composite spray filler layer (2) formed by wet spraying on the regular rock slope (1-1) is gradually reduced to 0; the anti-seepage geomembrane (3) laid on the regular rock slope (1-1) extends along the anti-seepage boundary (9) to the irregular rock slope (1-2) by a length L2, the anti-seepage cement composite spray filler layer (2) and the anti-seepage geomembrane (3) form a lap section in the bidirectional extension section; the rubber pad (7) and the thin steel plate (6) are drilled according to the designed aperture and spacing, and the drilling positions on the rubber pad (7) and the thin steel plate (6) correspond to each other; the hollow grouting anchor rod (4) is self-drillingly drilled from the drilling holes of the thin steel plate (6) and the rubber pad (7) and deeply penetrates into the rock in the anti-seepage cement composite spray filler layer (2) with a rock penetration angle of α and a rock penetration depth of La; the gaps between the thin steel plate (6), the rubber pad (7), the anti-seepage geomembrane (3), and the anti-seepage cement composite spray filler layer (2) are filled and bonded with an anti-seepage leakage stopping agent (8). ​ 2. The fixed structure of the anti-seepage transition section of the irregular rock slope surface of the mine solid waste landfill site according to claim 1, characterized in that: The thickness δ of the anti-seepage cement composite spray filler layer (2) formed by wet spraying on the irregular rock slope (1-2) is 5 cm to 15 cm, and the wet spraying length L1 on the regular rock slope (1-1) is 1.0 m to 2.0 m.

3. The fixed structure of the anti-seepage transition section of the irregular rock slope surface of the mine solid waste landfill site according to claim 1, characterized in that: The laid anti-seepage geomembrane (3) is an HDPE geomembrane with a specification of 1.5 mm to 2.0 mm, and the extension and laying length L2 is 0.8 m to 1.5 m.

4. The fixed structure of the anti-seepage transition section of the irregular rock slope surface of the mine solid waste landfill site according to claim 1, characterized in that: The hollow grouting anchor rod (4) is a full-length wave thread with a fixed nut (5) and a special rapid grouting joint, the specification of the hollow grouting anchor rod (4) is R20 to R25, the drilling rock penetration depth La is 50 cm to 1.5 m, the drilling hole spacing M along the axial direction is 30 cm to 50 cm, and the rock penetration angle α of the hollow grouting anchor rod (4) is 15° to 25°.

5. The fixed structure of the anti-seepage transition section of the irregular rock slope surface of the mine solid waste landfill site according to claim 4, characterized in that: The nut (5) is matched with the specification and size of the hollow grouting anchor rod (4), and the specification of the nut (5) is M16 to M20.

6. The fixed structure of the anti-seepage transition section of the irregular rock slope surface of the mine solid waste landfill site according to claim 5, characterized in that: The thin steel plate (6) is a steel plate with a thickness of less than 3 mm, a specification of 2 mm to 3 mm, a width B of 30 cm to 50 cm, an axial length L3 of 1 m to 2 m, a surface pre-drilling processing, a hole diameter matched with the specification of the hollow grouting anchor rod (4), a hole spacing M2 of 30 cm to 50 cm, and a rubber pad (7) lining; the rubber pad (7) is a high-pressure-resistant rubber pad with a thickness of 3 mm to 5 mm.

7. The fixed structure of the anti-seepage transition section of the irregular rock slope surface of the mine solid waste landfill site according to claim 2, characterized in that: The laid impermeable geomembrane (3) is HDPE geomembrane with a specification of 1.5mm-2.0mm, and the extension laying length L2=0.8m-1.5m; the hollow grouting anchor rod (4) is full-length wave thread, matched with a fixed nut (5) and a special quick grouting joint, the specification and model of the hollow grouting anchor rod (4) is R20-25, the drilling into rock depth La=50cm-1.5m, the hole spacing M along the axial direction is 30cm-50cm, and the hollow grouting anchor rod (4) rock inclination angle α=15°-25°; the nut (5) is matched with the specification and size of the hollow grouting anchor rod (4), and the specification and model of the nut (5) is M16-M20; the thin steel plate (6) is a steel plate with a thickness less than 3mm, and the specification and size is 2mm-3mm, the width B=30cm-50cm, the axial length L3=1-2m, the surface is pre-drilled, the hole diameter is matched with the specification of the hollow grouting anchor rod (4), the hole spacing M2=30cm-50cm, and the lining rubber pad (7); the rubber pad (7) is a high-pressure-resistant rubber pad with a thickness of 3mm-5mm.

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