CN112523264B - High-steep side slope seepage prevention system and laying method thereof - Google Patents
High-steep side slope seepage prevention system and laying method thereof Download PDFInfo
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- CN112523264B CN112523264B CN202011269592.9A CN202011269592A CN112523264B CN 112523264 B CN112523264 B CN 112523264B CN 202011269592 A CN202011269592 A CN 202011269592A CN 112523264 B CN112523264 B CN 112523264B
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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Abstract
The invention discloses a high-steep side slope seepage prevention system and a laying method thereof, wherein the high-steep side slope seepage prevention system comprises a field bottom seepage prevention structure, a hypotenuse slope seepage prevention structure and a steep side slope seepage prevention structure, the field bottom seepage prevention structure comprises a field bottom inverted filter layer, a leachate diversion layer, a field bottom seepage prevention film protection layer, a field bottom seepage prevention layer, a field bottom GCL bentonite layer, an under-film protection layer and a field bottom substrate layer, and the field bottom seepage prevention layer is a double-smooth-surface high-density polyethylene geomembrane; the hypotenuse slope seepage-proofing structure comprises a hypotenuse slope protection layer, a hypotenuse slope seepage-proofing film protection layer, a hypotenuse slope seepage-proofing layer, a hypotenuse slope GCL bentonite layer, a hypotenuse slope passivation layer and a hypotenuse slope substrate layer, wherein the hypotenuse slope seepage-proofing layer is a double-rough-surface high-density polyethylene geomembrane. The high-steep side slope seepage prevention system is provided with various seepage prevention structures according to the field bottom of the pit, the slope and the environment conditions of the steep side slope, and has the advantages of simple seepage prevention structures and good seepage prevention effect, so that each seepage prevention structure has a targeted seepage prevention effect according to the environment conditions.
Description
Technical Field
The invention relates to the technical field of pit repair and greening, in particular to a high-steep side slope seepage prevention system for pit seepage prevention and a paving method thereof.
Background
More and more pits are abandoned as the mining activities are finished, and the pits bring about great influence on the surrounding ecological environment and the life of residents due to the chronicity and irreversibility of the mining activities, and specific influence comprises the following steps: 1. original soil and vegetation are destroyed by quarry mining, and the ecological balance and the biodiversity of the adjacent biological communities are damaged to a certain extent; 2. the side slope formed by exploitation has geological disasters such as collapse, landslide, water and soil loss and the like, and serious threat is caused to the regional ecological environment; 3. the mining area is large, the periphery of the pit is vertical steep rock walls, and no protective measures exist around the top of the pit, so that potential safety hazards are caused for local villages and poultry and livestock. Therefore, the secondary development and utilization are carried out according to local conditions according to the characteristics of abandoned pits in quarries, and the method is a sustainable resource recycling mode at present.
Under the general condition, the pit is a rectangular concave pit which is not regular, and is influenced by bad factors such as insufficient soil fertility, lack of irrigation water source, serious land damage, larger gradient and the like. If the ecological system is restored by adopting a mode of backfilling organic nutrient soil to cover green in the range of the abandoned pit, the destination of the terminal products reaching the standard in municipal sludge treatment can be solved, and the purpose of restoration and utilization is completed, but because the leachate of the organic nutrient soil can infiltrate into underground water to cause pollution, the pit needs to be subjected to seepage prevention treatment before backfilling, and the leachate is separated from soil and underground water to prevent the leachate from polluting the soil and the underground water.
The existing high-steep side slope seepage prevention system is complex in structure and high in construction difficulty for seepage prevention work of a pit environment.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a high-steep side slope seepage prevention system for mine pit seepage prevention, which solves the conventional problems and has the advantages of simple structure and good seepage prevention effect.
The invention also provides a laying method adopting the high-steep slope seepage-proofing system.
The invention is realized by adopting the following technical scheme:
the high-steep side slope seepage prevention system is used for seepage prevention of a pit and comprises a field bottom seepage prevention structure, a hypotenuse slope seepage prevention structure positioned on one side of the field bottom seepage prevention structure and a steep side slope seepage prevention structure positioned on one side of the hypotenuse slope seepage prevention structure away from the field bottom seepage prevention structure; the field bottom impermeable structure comprises a field bottom inverted filter layer, a leachate diversion layer, a field bottom impermeable film protective layer, a field bottom impermeable layer, a field bottom GCL bentonite layer, a film lower protective layer and a field bottom base layer which are distributed from outside to inside, wherein the field bottom impermeable layer is a double-smooth-surface high-density polyethylene geomembrane; the hypotenuse slope seepage-proofing structure comprises a hypotenuse slope protection layer, a hypotenuse slope seepage-proofing film protection layer, a hypotenuse slope seepage-proofing layer, a hypotenuse slope GCL bentonite layer, a hypotenuse slope passivation layer and a hypotenuse slope basal layer which are distributed from outside to inside, wherein the hypotenuse slope seepage-proofing layer is a double-rough-surface high-density polyethylene geomembrane, and the double-rough-surface high-density polyethylene geomembrane is connected with the double-smooth-surface high-density polyethylene geomembrane by a seam welding method; the steep slope seepage-proofing structure is the same as the hypotenuse slope seepage-proofing structure.
Preferably, the thickness of the double-smooth-surface high-density polyethylene geomembrane is 2mm; the thickness of the double-rough-surface high-density polyethylene geomembrane is 2mm.
Preferably, the field bottom counter-filtration layer is 200g/m 2 Is a geotechnical filter screen; the leachate diversion layer is a crushed stone layer with the thickness of 300 mm; the protective layer of the field bottom impermeable film is 600g/m 2 Is a non-woven geotextile of (a); the field base GCL bentonite layer consists of 4800g/m 2 Is composed of bentonite cushion layer and geotextile; the protective layer under the film is 600g/m 2 Is a non-woven geotextile of (a); the field base bottom layer is formed by compacting and flattening clay.
Preferably, the bevel slope protection layer is formed by piling broken stone sand bags; the protective layer of the seepage-proofing film of the hypotenuse slope is 600g/m 2 Is a non-woven geotextile of (a); the GCL bentonite layer of the inclined slope consists of 4800g/m 2 Is composed of bentonite cushion layer and geotextile; the bevel slope surface passivation layer is a screen-hanging guniting layer; the hypotenuse slope stratum basale is the rock mass layer.
Preferably, the lower part of the bottom layer of the foundation of the field is provided with a groundwater drainage layer, and the groundwater drainage layer is a crushed stone inverted filter layer with the thickness of 800 mm; and a drainage blind ditch is arranged on the inclined slope basal layer.
The invention also provides a laying method of the high-steep slope seepage-proofing system, which comprises the following steps:
s1: paving a field bottom: firstly, arranging a field bottom anchoring groove at the edge where the field bottom is connected with a side slope, then paving each layer of material in the field bottom anti-seepage structure, and fixing one end of the geotechnical material in the field bottom anti-seepage structure through the field bottom anchoring groove when paving, wherein the geotechnical material in the field bottom anti-seepage structure extends out of the field bottom anchoring groove to be not less than 1m;
s2: paving a slope: setting a slope anchoring groove on the slope top of the slope, paving a slope seepage-proofing structure, and fixing one end of the geotechnical material in the slope seepage-proofing structure through the slope anchoring groove when paving, wherein the geotechnical material in the slope seepage-proofing structure extends out of the slope anchoring groove by not less than 1m; after the fixation, connecting the other end of the geotechnical material in the hypotenuse slope seepage-proofing structure with one end of the geotechnical material in the field bottom seepage-proofing structure;
s3: backfilling organic nutrient soil: backfilling organic nutrient soil to the horizontal line of the inclined slope anchoring ditch, compacting in layers, and leveling the organic nutrient soil within 5m from the side slope;
s4: paving a steep slope: dividing the steep slope into a plurality of parts at a height of 10m, setting a steep slope anchoring ditch at the joint of the divided steep slope, paving each layer of material in the steep slope seepage-proofing structure, fixing one end of the geotechnical material in the steep slope seepage-proofing structure through the steep slope anchoring ditch, setting an anchoring structure every 5m height during paving, anchoring the unfixed part of the geotechnical material in the steep slope seepage-proofing structure on the steep slope, connecting one end of the geotechnical material in the steep slope seepage-proofing structure with one end of the geotechnical material in the hypotenuse slope seepage-proofing structure after anchoring, and paving the outermost layer in the steep slope seepage-proofing structure;
s5: repeating the steps S3 and S4, paving the rest steep slopes in the steep slope seepage-proofing structure, and paving the rest steep slopes to the tops of the steep slopes.
Preferably, in step S2, if the slope length of the inclined slope is greater than 10m or the slope height is greater than 5m, an inclined slope anchoring groove is added.
Preferably, in step S4, the anchoring structure includes an anchoring bolt, a first anchoring steel plate, a first HDPE film pad, a second anchoring steel plate, a nut, a PE cap pad, and an anchoring impermeable film, the geotechnical material in the steep slope impermeable structure is sandwiched between the first HDPE film pad and the second HDPE film pad, and the anchoring impermeable film is connected with the geotechnical material on the outermost layer in the steep slope impermeable structure by welding.
Preferably, the first anchoring steel plate has a specification of 100mm in width and 3mm in thickness; and an anchor hole for installing an anchor bolt is formed in each end of each first anchor steel plate 100mm away from the end point.
Preferably, in step S5, the final laying height of the steep slope seepage-proofing structure on the steep slope is 2m or more higher than the final backfill height of the organic nutrient soil.
Compared with the prior art, the invention has the beneficial effects that:
the high-steep side slope seepage prevention system is provided with a field bottom seepage prevention structure, a bevel side slope seepage prevention structure and a steep side slope seepage prevention structure according to the environmental conditions of the field bottom, the bevel side slope and the steep side slope of the pit, each seepage prevention structure is simple, the seepage prevention effect is good, the field bottom seepage prevention layer adopts a double-smooth-surface high-density polyethylene geomembrane, and the side slope seepage prevention layer adopts a double-rough-surface high-density polyethylene geomembrane, so that each seepage prevention structure has a targeted seepage prevention effect according to the environmental conditions.
According to the method for paving the high-steep side slope seepage-proofing system, according to the environment that the height of the side slope of a pit is high and steep, climbing operation is difficult, and the paving process of paving while burying from bottom to top is adopted, so that the operation safety of paving construction is improved, and the welding quality of a seepage-proofing film is ensured.
Drawings
FIG. 1 is a schematic diagram of the high steep slope anti-seepage system of the invention;
FIG. 2 is a schematic view of the anchoring node design of the steep slope of FIG. 1;
FIG. 3 is a schematic view of the anchoring structure at the top of the steep slope seepage-proofing structure shown in FIG. 1.
In the figure: 10. a field bottom seepage prevention structure; 11. a field bottom reverse filtering layer; 12. a leachate diversion layer; 13. a field bottom anti-seepage film protective layer; 14. a field bottom impermeable layer; 15. a field bottom GCL bentonite layer; 16. a protective layer under the film; 17. a field base bottom layer; 20. an anti-seepage structure of the slope; 21. a bevel edge slope protection layer; 22. a hypotenuse slope impervious film protective layer; 23. a hypotenuse slope impermeable layer; 24. a slope GCL bentonite layer; 25. a hypotenuse slope passivation layer; 26. a hypotenuse slope basal layer; 30. an impermeable structure of a steep slope; 31. a drainage ditch; 32. a steep slope protection layer; 33. a steep slope seepage-proofing film protective layer; 34. a steep slope impermeable layer; 35. steep slope GCL bentonite layer; 36. a steep slope passivation layer; 37. a steep slope basal layer; 40. a field bottom anchoring trench; 50. slope anchoring ditch; 60. steep slope anchoring ditch; 70. constructing an anchoring structure; 71. an anchor bolt; 72. a first anchor steel plate; 73. a first HDPE film pad; 74. a second HDPE film pad; 75. a second anchor steel plate; 76. a screw cap; 77. PE cap pad; 78. and anchoring the seepage-proof membrane.
Detailed Description
The invention will be further described with reference to the accompanying drawings and detailed description below:
as shown in fig. 1 to 3, the high-steep side slope seepage prevention system of the invention comprises a field bottom seepage prevention structure 10, a hypotenuse slope seepage prevention structure 20 positioned on one side of the field bottom seepage prevention structure 10, and a steep side slope seepage prevention structure 30 positioned on one side of the hypotenuse slope seepage prevention structure 20 away from the field bottom seepage prevention structure 10, wherein the field bottom seepage prevention structure 10 comprises a field bottom inverted filter 11, a leachate diversion layer 12, a field bottom seepage prevention film protection layer 13, a field bottom seepage prevention layer 14, a field bottom GCL bentonite layer 15, a film bottom protection layer 16 and a field bottom layer 17 which are arranged from outside to inside; the field bottom impermeable layer 14 is a double-smooth-surface high-density polyethylene geomembrane; the hypotenuse slope impervious structure 20 comprises a hypotenuse slope protection layer 21, a hypotenuse slope impervious film protection layer 22, a hypotenuse slope impervious layer 23, a hypotenuse slope GCL bentonite layer 24, a hypotenuse slope passivation layer 25 and a hypotenuse slope basal layer 26 which are distributed from outside to inside, wherein the hypotenuse slope impervious layer 23 is a double-rough-surface high-density polyethylene geomembrane, and the double-rough-surface high-density polyethylene geomembrane is connected with the double-smooth-surface high-density polyethylene geomembrane by a seam welding method; the steep slope seepage-proofing structure 30 is the same as the hypotenuse slope seepage-proofing structure 20, namely the steep slope seepage-proofing structure 30 comprises a steep slope protection layer 32, a steep slope seepage-proofing film protection layer 33, a steep slope seepage-proofing layer 34, a steep slope GCL bentonite layer 35, a steep slope passivation layer 36 and a steep slope basal layer 37 which are distributed from outside to inside, the steep slope seepage-proofing layer 34 is a double-rough-surface high-density polyethylene geomembrane, and the double-rough-surface high-density polyethylene geomembrane in the steep slope seepage-proofing structure 30 is connected with the double-rough-surface high-density polyethylene geomembrane in the hypotenuse slope seepage-proofing structure 20 through a seam welding method.
The double-smooth-surface high-density polyethylene geomembrane is formed by copolymerizing high-quality polyethylene resin through a three-layer coextrusion blow molding technology and a double-layer coextrusion casting technology, and has the advantages of good physical and mechanical properties, high tearing strength, strong deformation adaptability, puncture resistance, ageing resistance, ultraviolet resistance, oil resistance, salt resistance, acid and alkali resistance, corrosion resistance, high and low temperature resistance, no toxicity, long service life, good waterproof, drainage, seepage prevention and moisture prevention effects, low cost and simple construction. Optionally, the thickness of the double-smooth-surface high-density polyethylene geomembrane is 2mm, and the thickness is too large, so that the difficulty in laying is increased, the thickness is too small, and the double-smooth-surface high-density polyethylene geomembrane is easy to puncture.
The double rough surface high density polyethylene geomembrane is prepared from high density polyethylene resin, has higher ultraviolet resistance besides the performance of a smooth surface with high density, improves the friction coefficient, increases the slope stability of a geosynthetic material so as to finally enable the available volume which the geomembrane can bear, is more suitable for the design requirements of steep slopes and vertical projects, improves the engineering stability, has reliable seepage prevention effect, has the permeability coefficient of less than 10-17cm/s, has high tensile strength, elongation at break and puncture resistance, and has the characteristics of high joint strength, detection equipment, stable material, strong chemical resistance, easier construction and laying, low price, wide application and the like, and the joint is connected by adopting a hot welding machine with double joints. Optionally, the thickness of the double-rough-surface high-density polyethylene geomembrane is 2mm, and the thickness is too large, so that the difficulty in laying is increased, the thickness is too small, and the double-rough-surface high-density polyethylene geomembrane is easy to puncture.
The high-steep side slope seepage prevention system is provided with the field bottom seepage prevention structure 10, the bevel side slope seepage prevention structure 20 and the steep side slope seepage prevention structure 30 according to the environmental conditions of the field bottom, the bevel side slope and the steep side slope of the pit, each seepage prevention structure is simple, the seepage prevention effect is good, the field bottom seepage prevention layer 14 is made of a double-smooth-surface high-density polyethylene geomembrane, and the side slope seepage prevention layer is made of a double-rough-surface high-density polyethylene geomembrane, so that each seepage prevention structure has a targeted seepage prevention effect according to the environmental conditions.
Wherein the gradient of the slope in the hypotenuse slope impervious structure 20 is not more than 1:2, and the gradient of the steep slope in the steep slope impervious structure 30 is more than 1:2; the field bottom seepage prevention structure 10, the hypotenuse slope seepage prevention structure 20 and the steep slope seepage prevention structure 30 are welded to ensure that each seepage prevention structure can be tightly connected, and it can be understood that one end of each geotechnical material in the field bottom seepage prevention structure 10 is connected with the lower end of each geotechnical material in the hypotenuse slope seepage prevention structure 20 in a welding mode; the upper ends of the geotechnical materials in the hypotenuse slope impervious structure 20 are connected with the lower ends of the geotechnical materials in the steep slope impervious structure 30 by welding.
Optionally, a field bottom anchoring groove 40 is arranged at the edge where the field bottom of the field bottom anti-seepage structure 10 is connected with the slope of the hypotenuse slope anti-seepage structure 20, and the outer side of the geotechnical material overhanging field bottom anchoring groove 40 in the field bottom anti-seepage structure 10 is not less than 1m, so that the geotechnical material of the field bottom anti-seepage structure 10 is conveniently welded with the geotechnical material of the hypotenuse slope anti-seepage structure 20.
The slope of the slope seepage-proofing structure 20 is provided with at least one slope anchoring groove 50, if the slope length of the slope is greater than 10m or the slope height is greater than 5m, the slope anchoring groove 50 needs to be added, which can be understood as: the length of the inclined slope is smaller than 10m or the height of the inclined slope is smaller than 5m, the number of the inclined slope anchoring grooves 50 is one, and the inclined slope anchoring grooves 50 are arranged at the slope top of the inclined slope; the slope length of the inclined side slope is larger than 10m and smaller than 20m or the slope height is larger than 5m and smaller than 10m, the number of the inclined side slope anchoring grooves 50 is two, and the like, so that the inclined side slope seepage prevention structure 20 on the inclined side slope can be stable, and the design safety is met; the outside of the geotextile overhanging type hypotenuse slope anchoring groove 50 in the hypotenuse slope seepage prevention structure 20 is not less than 1m so that the geotextile of the hypotenuse slope seepage prevention structure 20 on the upper layer is welded with the geotextile of the hypotenuse slope seepage prevention structure 20 on the lower layer or the geotextile of the hypotenuse slope seepage prevention structure 20 is welded with the geotextile of the steep slope seepage prevention structure 30.
At least one steep slope anchoring groove 60 is arranged on the steep slope of the steep slope seepage-proofing structure 30, one steep slope anchoring groove 60 is arranged on each 10 m-high steep slope, and the outer side of the geotechnical material overhanging steep slope anchoring groove 60 in the steep slope seepage-proofing structure 30 is not smaller than 1m, so that the geotechnical material of the upper steep slope seepage-proofing structure 30 is welded with the geotechnical material of the lower steep slope seepage-proofing structure 30. Blind ditches are built on the steep slope anchoring ditches 60, and round corners are arranged on the outer corners of the blind ditches, so that the steep slope anchoring ditches 60 can be prevented from damaging the steep slope seepage-proofing structure 30. The steep slope of the steep slope seepage-proofing structure 30 is further provided with at least one anchoring structure 70, one anchoring structure 70 is provided for every 5m steep slope, it can be understood that the vertical distance between the anchoring structures 70 is 5m, and the fixed connection between the unfixed portion of the steep slope seepage-proofing structure 30 and the steep slope is enhanced by the anchoring structures 70.
In one embodiment, the anchoring structure 70 is disposed at 1m from the hypotenuse slope anchoring groove 50, or the anchoring structure 70 is disposed at greater than 1m and less than or equal to 5m from the hypotenuse slope anchoring groove 50; as shown in fig. 2, the anchoring structure 70 includes an anchoring bolt 71, a first anchoring steel plate 72, a first HDPE film pad 73, a second HDPE film pad 74, a second anchoring steel plate 75, a nut 76, a PE cap pad 77 and an anchoring impermeable film 78, the anchoring bolt 71 is sequentially threaded through the second anchoring steel plate 75, the second HDPE film pad 74, the steep slope impermeable structure 30, the first HDPE film pad 73 and the first anchoring steel plate 72 from top to bottom, one end of the anchoring bolt 71 is buried in a bedrock of the steep slope, the other end of the anchoring bolt 71 is screwed by the nut 76, the PE cap pad 77 is sleeved on the nut 76, the anchoring impermeable film 78 is disposed above the PE cap pad 77, and the anchoring impermeable film 78 is connected with the upper and lower surfaces of the steep slope impermeable structure 30 such as a non-woven geotextile by welding. Alternatively, the anchor bolts 71 are self-expanding bottom bolts of phi 10, the horizontal distance between the anchor bolts 71 is 500mm, the specification of the first anchor steel plates 72 is 100mm in width and 3mm in thickness, the first anchor steel plates are arranged continuously and uninterruptedly, the first anchor steel plates are arranged continuously and can be understood as being arranged in a full length mode, and one anchor bolt 71 is arranged at each end of each first anchor steel plate 72, which is 100mm away from an end point; the second anchor steel plate 75 has the same structure as the first anchor steel plate 72; the anchor barrier film 78 is a 300mm wide HDPE barrier film; the first HDPE film pad 73 is 100mm wide and is provided continuously and uninterrupted; the second HDPE film pad 74 has the same structure as the first HDPE film pad 73.
In one embodiment, the field bottom filter layer 11 is 200g/m 2 And the geotechnical filter screen is used for preventing the organic nutrient soil from entering the lower layer structure and allowing the liquid to pass through. The leachate diversion layer 12 is a crushed stone layer with the thickness of 300 mm.
The field bottom impermeable film protective layer 13 is 600g/m 2 The non-woven geotextile produced by adopting a non-woven process such as a needling process, a chemical impregnation process, a hot rolling process, a spunbonding process and the like has good filtering, draining, isolating and reinforcing effects.
The field base GCL bentonite layer 15 consists of 4800g/m 2 The bentonite pad layer and geotextile are clamped and sealed by two layers of geotextile, and the composite material is manufactured by needling, bonding or sewing, and has good sealing and seepage preventing effects.
The protective layer 16 under the film was 600g/m 2 The non-woven geotextile of the utility model ensures that the field bottom impermeable layer 14 and the field bottom GCL bentonite layer 15 can better exert the impermeable effect under the protection of the field bottom impermeable film protective layer 13 and the under-film protective layer 16.
The field base bottom layer 17 is formed by compacting and leveling clay, and the design elevation is required. Wherein, the lower part of the foundation bottom layer 17 is provided with a groundwater drainage layer, which is a broken stone reversed filter layer with the thickness of 800mm and is used for collecting and discharging the groundwater of the landfill.
The inclined slope protection layer 21 is formed by piling broken stone sand bags, and is paved in a side backfilling and side piling mode, so that the inclined slope is firmer; the hypotenuse slope anti-seepage film protective layer 22 is 600g/m 2 Is a non-woven geotextile of (a); the inclined slope GCL bentonite layer 24 is composed of 4800g/m 2 Is composed of bentonite cushion layer and geotextile; the passivation layer 25 of the sloping slope surface is a net hanging and slurry spraying layer so as to prevent the slope surface from being eroded by mountain water flow and corroded by rainwater, so that broken rock stratum in a certain depth of the slope surface is reinforced; the sloping substrate layer 26 is a rock mass layer, wherein a drainage blind ditch is arranged on the sloping substrate layer 26.
The laying method of the high-steep slope seepage-proofing system comprises the following steps:
s1: preparation work before laying: 1. performing relevant performance inspection and test before each geotechnical material enters the field; 2. checking the leveling and passivation conditions of the foundation bases of the ground bottom and the side slope, wherein no sharp shape exists, otherwise, cement mortar is adopted for trowelling; 3. each geotechnical material should be correctly placed and marked according to the position in the plan view, and the laying area is reasonably planned according to the daily welding amount.
S2: paving a field bottom: firstly, arranging a field bottom anchoring groove 40 at the edge where the field bottom is connected with a side slope, then paving each layer of material in the field bottom anti-seepage structure 10, and fixing one end of the geotechnical material in the field bottom anti-seepage structure 10, such as a geotechnical filter screen, non-woven geotechnical cloth, geotechnical cloth and the like, through the field bottom anchoring groove 40, wherein the outer side of the geotechnical material in the field bottom anti-seepage structure 10 extends out of the field bottom anchoring groove 40 to be not less than 1m so as to be convenient for connection with the geotechnical material in the next step; if the slope length of the inclined slope is greater than 10m or the slope height is greater than 5m, the inclined slope anchoring groove 50 is additionally arranged.
S3: paving a slope: the slope top of the hypotenuse slope is provided with a hypotenuse slope anchoring groove 50, then the hypotenuse slope seepage-proofing structure 20 is paved, and when paving, one end of the geotechnical material in the hypotenuse slope seepage-proofing structure 20, such as non-woven geotextile, geotextile and the like, is fixed through the hypotenuse slope anchoring groove 50, and the outer side of the geotechnical material overhanging hypotenuse slope anchoring groove 50 in the hypotenuse slope seepage-proofing structure 20 is not less than 1m; after the fixation, the other end of the geotechnical material in the hypotenuse slope seepage prevention structure 20 is connected with one end of the geotechnical material of the overhanging field bottom anchoring groove 40 in the field bottom seepage prevention structure 10;
s4: backfilling organic nutrient soil: backfilling the organic nutrient soil to the horizontal line of the inclined slope anchoring ditch 50, compacting in layers, and leveling the organic nutrient soil within 5m from the side slope to meet construction bearing requirements;
s5: paving a steep slope: dividing the steep slope into a plurality of parts at a height of 10m, arranging a steep slope anchoring ditch 60 at the joint of the divided steep slope, paving each layer of material in the steep slope seepage-proofing structure 30, fixing one end of the geotechnical material in the steep slope seepage-proofing structure through the steep slope anchoring ditch so as to strengthen the fixed connection between the steep slope seepage-proofing structure 30 and the steep slope, arranging an anchoring structure every 5m height during paving, anchoring the part of the geotechnical material in the steep slope seepage-proofing structure which is not fixed on the steep slope, connecting one end of the geotechnical material in the steep slope seepage-proofing structure with one end of the geotechnical material in the hypotenuse slope seepage-proofing structure after anchoring, and paving the outermost layer in the steep slope seepage-proofing structure; the outer side of the geotechnical material overhanging steep slope anchoring ditch 60 in the steep slope seepage-proofing structure 30 is not less than 1m;
s6: and repeating the steps S4 and S5, paving the rest steep slopes into the steep slope seepage-proofing structure 30, and paving the rest steep slopes to the tops of the steep slopes.
The anchor structure 70 comprises an anchor bolt 71, a first anchor steel plate 72, a first HDPE film pad 73, a second HDPE film pad 74, a second anchor steel plate 75, a nut 76, a PE cap pad 77 and an anchor impermeable film 78 which are arranged on the anchor bolt 71, wherein the geotechnical material in the steep slope impermeable structure 30 is clamped between the first HDPE film pad 73 and the second HDPE film pad 74, and the anchor impermeable film 78 is connected with the geotechnical material of the outermost layer in the steep slope impermeable structure 30, such as non-woven geotechnical cloth, in a welding mode.
Wherein, if the adjacent self-anchoring bolts 71 are not on a horizontal line, the overlapping length of the first anchoring steel plate 72 and the second anchoring steel plate 75 is not less than 1m; the first anchor steel plate 72 and the second anchor steel plate 75 are both 100mm in width and 3mm in thickness; each end of the first and second anchor steel plates 72 and 75 is provided with an anchor hole for mounting the anchor bolt 71 at a distance of 100mm from the end point. The final paving height of the steep slope seepage-proofing structure 30 on the steep slope is more than 2m higher than the final backfill height of the organic nutrient soil.
The specific paving method of the steep slope comprises the following steps: firstly, the side slope is subjected to stable passivation, a steep side slope anchoring ditch 60 is arranged on the steep side slope with the height of 10m, anchoring nodes are positioned and paid out on the side slope, self-anchoring bolts 71 are implanted into the side slope and keep stable, each anchoring bolt 71 is kept on a horizontal line, then a first anchoring steel plate 72, a first HDPE film pad 73, a steep side slope GCL bentonite layer 35, a steep side slope impermeable layer 34, a steep side slope impermeable film protective layer 33, a second HDPE film pad 74 and a second anchoring steel plate 75 are sequentially arranged on the anchoring bolts 71, nuts 76 are sleeved on the top of the anchoring bolts 71, PE cap pads 77 and anchoring impermeable films 78 are paved, the anchoring impermeable films 78 are welded with the steep side slope impermeable film protective layer 33, crushed stone sand bags of the steep side slope protective layer 32 are paved, then the geotechnical materials in the steep side slope impermeable structures 30 are fixed and connected in the steep side slope anchoring ditch 60, finally organic nutrient soil is backfilled to the horizontal line of the steep side slope anchoring ditch 60, the steep side slope impermeable films 33 are compacted, the steep side slope impermeable layers are leveled, the slope impermeable layers within the range of 5m, and the slope is paved on the steep side slope impermeable layers by the slope impermeable layers, and the slope impermeable layers are paved on the slope layer 10 m. Wherein, the joint of the impermeable material in the steep slope impermeable structure 30 is not positioned at the same position with the joint of the first anchor steel plate 72 and the second anchor steel plate 75.
As shown in fig. 3, the gradient of the paved steep slope is 1:3, and a drainage ditch 31 is arranged at the top of the steep slope seepage-proofing structure 30.
According to the laying method of the high-steep side slope seepage-proofing system, according to the environment that the height of the side slope of a pit is high and steep, climbing operation is difficult, and the laying process of laying and burying is adopted from bottom to top, so that the operation safety of laying construction is improved, and the welding quality of a seepage-proofing film is ensured.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the invention as defined in the appended claims.
Claims (8)
1. The high-steep side slope seepage prevention system is used for seepage prevention of a pit and is characterized by comprising a field bottom seepage prevention structure, a hypotenuse slope seepage prevention structure positioned on one side of the field bottom seepage prevention structure and a steep side slope seepage prevention structure positioned on one side of the hypotenuse slope seepage prevention structure away from the field bottom seepage prevention structure; the field bottom impermeable structure comprises a field bottom inverted filter layer, a leachate diversion layer, a field bottom impermeable film protective layer, a field bottom impermeable layer, a field bottom GCL bentonite layer, a film lower protective layer and a field bottom base layer which are distributed from outside to inside, wherein the field bottom impermeable layer is a double-smooth-surface high-density polyethylene geomembrane; the hypotenuse slope seepage-proofing structure comprises a hypotenuse slope protection layer, a hypotenuse slope seepage-proofing film protection layer, a hypotenuse slope seepage-proofing layer, a hypotenuse slope GCL bentonite layer, a hypotenuse slope passivation layer and a hypotenuse slope basal layer which are distributed from outside to inside, wherein the hypotenuse slope seepage-proofing layer is a double-rough-surface high-density polyethylene geomembrane, and the double-rough-surface high-density polyethylene geomembrane is connected with the double-smooth-surface high-density polyethylene geomembrane by a seam welding method; the steep slope seepage-proofing structure is the same as the hypotenuse slope seepage-proofing structure;
the high-steep side slope seepage prevention system is paved through the following steps:
s1: paving a field bottom: firstly, arranging a field bottom anchoring groove at the edge where the field bottom is connected with a side slope, then paving each layer of material in the field bottom anti-seepage structure, and fixing one end of the geotechnical material in the field bottom anti-seepage structure through the field bottom anchoring groove when paving, wherein the geotechnical material in the field bottom anti-seepage structure extends out of the field bottom anchoring groove to be not less than 1m;
s2: paving a slope: setting a slope anchoring groove on the slope top of the slope, paving a slope seepage-proofing structure, and fixing one end of the geotechnical material in the slope seepage-proofing structure through the slope anchoring groove when paving, wherein the geotechnical material in the slope seepage-proofing structure extends out of the slope anchoring groove by not less than 1m; after the fixation, connecting the other end of the geotechnical material in the hypotenuse slope seepage-proofing structure with one end of the geotechnical material in the field bottom seepage-proofing structure;
s3: backfilling organic nutrient soil: backfilling organic nutrient soil to the horizontal line of the inclined slope anchoring ditch, compacting in layers, and leveling the organic nutrient soil within 5m from the side slope;
s4: paving a steep slope: dividing the steep slope into a plurality of parts at a height of 10m, setting a steep slope anchoring ditch at the joint of the divided steep slope, paving each layer of material in the steep slope seepage-proofing structure, fixing one end of the geotechnical material in the steep slope seepage-proofing structure through the steep slope anchoring ditch, setting an anchoring structure every 5m height during paving, anchoring the unfixed part of the geotechnical material in the steep slope seepage-proofing structure on the steep slope, connecting one end of the geotechnical material in the steep slope seepage-proofing structure with one end of the geotechnical material in the hypotenuse slope seepage-proofing structure after anchoring, and paving the outermost layer in the steep slope seepage-proofing structure;
s5: repeating the steps S3 and S4, paving the rest steep slopes in a steep slope seepage-proofing structure, and paving the rest steep slopes to the tops of the steep slopes;
the inclined slope basal layer is a rock mass layer, and the inclined slope surface passivation layer is a net hanging guniting layer;
in step S4, the anchoring structure includes an anchoring bolt, a first anchoring steel plate, a first HDPE film pad, a second anchoring steel plate, a nut, a PE cap pad and an anchoring impermeable film, wherein the geotechnical material in the impermeable structure of the steep slope is sandwiched between the first HDPE film pad and the second HDPE film pad, and the anchoring impermeable film is connected with the geotechnical material on the outermost layer in the impermeable structure of the steep slope by welding;
blind ditches are built on the steep slope anchoring ditches, and round corners are arranged on the external corners of the blind ditches;
the top of the steep slope seepage-proofing structure is provided with a drainage ditch;
the number of the anchoring structures is multiple, and the vertical distance between the anchoring structures is 5m.
2. The high steep slope anti-seepage system according to claim 1, wherein the thickness of the bi-smooth surface high density polyethylene geomembrane is 2mm; the thickness of the double-rough-surface high-density polyethylene geomembrane is 2mm.
3. The height according to claim 1The abrupt slope seepage-proofing system is characterized in that the field bottom reverse filtering layer is 200g/m 2 Is a geotechnical filter screen; the leachate diversion layer is a crushed stone layer with the thickness of 300 mm; the protective layer of the field bottom impermeable film is 600g/m 2 Is a non-woven geotextile of (a); the field base GCL bentonite layer consists of 4800g/m 2 Is composed of bentonite cushion layer and geotextile; the protective layer under the film is 600g/m 2 Is a non-woven geotextile of (a); the field base bottom layer is formed by compacting and flattening clay.
4. The high and steep slope anti-seepage system according to claim 1, wherein the hypotenuse slope protection layer is built by piling up crushed stone sand bags; the protective layer of the seepage-proofing film of the hypotenuse slope is 600g/m 2 Is a non-woven geotextile of (a); the GCL bentonite layer of the inclined slope consists of 4800g/m 2 The bentonite cushion layer and geotextile.
5. The high and steep slope anti-seepage system according to claim 1, wherein the lower part of the foundation bottom layer is provided with a groundwater drainage layer, and the groundwater drainage layer is a crushed stone inverted filter layer with the thickness of 800 mm; and a drainage blind ditch is arranged on the inclined slope basal layer.
6. The high and steep slope anti-seepage system according to claim 1, wherein in step S2, if the slope length of the sloping side is greater than 10m or the slope height is greater than 5m, a slope anchoring groove is added.
7. The high steep slope anti-seepage system according to claim 1, wherein the first anchor steel sheet has a gauge of 100mm width and 3mm thickness; and an anchor hole for installing an anchor bolt is formed in each end of each first anchor steel plate 100mm away from the end point.
8. The high-steep slope seepage prevention system according to claim 1, wherein in step S5, the final laying height of the steep slope seepage prevention structure on the steep slope is more than 2m higher than the final backfill height of the organic nutrient soil.
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| CN114809111A (en) * | 2022-07-01 | 2022-07-29 | 北京高能时代环境技术股份有限公司 | Whole seepage prevention structure of contaminated soil temporary storage yard |
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