CN110029632B - General industrial solid waste storage and disposal site structure and construction method thereof - Google Patents
General industrial solid waste storage and disposal site structure and construction method thereof Download PDFInfo
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- CN110029632B CN110029632B CN201910313709.XA CN201910313709A CN110029632B CN 110029632 B CN110029632 B CN 110029632B CN 201910313709 A CN201910313709 A CN 201910313709A CN 110029632 B CN110029632 B CN 110029632B
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- 238000010276 construction Methods 0.000 title claims abstract description 24
- 238000003860 storage Methods 0.000 title claims abstract description 21
- 239000002910 solid waste Substances 0.000 title claims abstract description 20
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 229920001903 high density polyethylene Polymers 0.000 claims description 36
- 239000004700 high-density polyethylene Substances 0.000 claims description 36
- 239000004746 geotextile Substances 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 229910001220 stainless steel Inorganic materials 0.000 claims description 20
- 239000010935 stainless steel Substances 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 14
- 239000004575 stone Substances 0.000 claims description 13
- 239000004567 concrete Substances 0.000 claims description 12
- 238000011144 upstream manufacturing Methods 0.000 claims description 11
- 229920006262 high density polyethylene film Polymers 0.000 claims description 10
- 239000011150 reinforced concrete Substances 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 238000004873 anchoring Methods 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 6
- 238000009412 basement excavation Methods 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 2
- 230000008595 infiltration Effects 0.000 abstract description 9
- 238000001764 infiltration Methods 0.000 abstract description 9
- 238000003466 welding Methods 0.000 abstract description 9
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000004698 Polyethylene Substances 0.000 description 11
- 230000004888 barrier function Effects 0.000 description 9
- 239000010865 sewage Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/06—Earth-fill dams; Rock-fill dams
-
- E—FIXED CONSTRUCTIONS
- 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
-
- E—FIXED CONSTRUCTIONS
- 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
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/006—Sealing of existing landfills, e.g. using mining techniques
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Hydrology & Water Resources (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Ocean & Marine Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a general industrial solid waste storage and disposal site structure and a construction method thereof. The storage and disposal site structure comprises a landfill area, an impermeable layer, an initial dam, a safety dam and a percolate collecting system, wherein the impermeable layer is paved at the bottom of the landfill area, the initial dam is arranged in the landfill area and is positioned on the impermeable layer, the safety dam is arranged at the downstream of the initial dam, one side of the safety dam is connected with the impermeable layer, and the percolate collecting system is used for collecting percolate in the landfill area and discharging the collected percolate to the downstream of the safety dam. The welding position of the elbow and the impermeable layer has small load, is not easy to crack, and has low environmental protection and safety risks. The percolate in the landfill reservoir area can be discharged in time through the rock-fill dam, so that the rise of the infiltration line in the landfill reservoir area is avoided. The percolate collecting system is rigidly fixed through the initial dam and the safety dam, is little influenced by geological conditions and construction quality, and has good percolate collecting and guiding and draining capability.
Description
Technical Field
The invention relates to a general industrial solid waste storage and disposal site structure and a construction method thereof, which are applicable to a second type of storage and disposal sites needing to control the height of a wetting line and can be extended to similar projects such as household garbage landfill sites, dangerous waste safe landfill disposal sites and the like.
Background
In order to control the water level of the percolate in the landfill reservoir area, effective drainage should be implemented on the percolate stored in the landfill reservoir area, and if the percolate in the landfill reservoir area is improperly treated, leakage is very easy to occur, and pollution is caused to the surrounding environment and underground water. For this reason, chinese patent document with publication No. CN203878626U discloses a structure that a PE pipe passes through a yard HDPE impermeable film, including a PE pipe and a yard HDPE impermeable film, the yard HDPE impermeable film is laid on a slope of the yard, the PE pipe penetrates into the yard from outside the yard slope, a circular hole is drawn out at the intersection with the PE pipe on the yard HDPE impermeable film, so that the PE pipe passes through the circular hole, and a HDPE film sleeve is sleeved on the PE pipe, and two ends of the HDPE film sleeve are respectively welded with the PE pipe and the yard HDPE impermeable film through welding seams. By extruding the welding seam, an integral body is formed between the HDPE impermeable films of the storage yard and the PE pipe, so that percolate is prevented from leaking from the gap between the PE pipe and the HDPE impermeable films of the storage yard. However, the welding position of the HDPE film and the PE pipe is positioned at a hidden position, so that the load is large, the PE pipe is easy to crack, the overhaul condition is not met, and the environmental protection and safety risks are high.
For another example, chinese patent publication No. CN1944811a discloses a leachate pumping side pipe well, which is characterized in that a side pipe well is arranged on an impermeable liner system, a sewage pump is arranged in the side pipe well, the sewage pump is connected with one end of a sewage pump discharge pipe, the other end of the sewage pump discharge pipe is connected to the outside of the side pipe well, the side pipe well comprises a horizontal pipe arranged on a bottom impermeable liner system, an inclined pipe arranged on an impermeable liner system on a side wall of a storage area, and an elbow pipe connecting the horizontal pipe and the inclined pipe, and the horizontal pipe is provided with water seepage holes. The flexible structure welded by HDPE pipes or connected by flanges can be coordinated with an impermeable lining system of a reservoir, is favorable for implementing backflushing anti-blocking measures, and is suitable for pressure pumping and draining of leachate in a landfill reservoir and an adjusting tank, wherein the reservoir area is large, and the lowest part of the reservoir bottom is deep. However, the side pipe well adopts a flexible connection mode, is not effectively fixed, and can be influenced by geological conditions and construction quality to reduce the percolate collecting capacity and even lose the percolate collecting capacity, so that the percolate in the reservoir area rises, and potential safety hazards of dam instability exist.
Disclosure of Invention
In order to solve the technical problems, the invention provides a general industrial solid waste storage and disposal site structure and a construction method thereof.
The invention is realized by the following technical scheme:
the utility model provides a general industry solid waste stores, disposal site structure, includes landfill reservoir area, barrier layer, initial dam, safety dam and percolate collecting system, the barrier layer is laid in the bottom of landfill reservoir area, the initial dam is established in the landfill reservoir area, and is located the barrier layer, the safety dam is established in the low reaches of initial dam, and its one side is connected with the barrier layer, percolate collecting system collects the percolate in the landfill reservoir area to the low reaches of discharging the percolate of collecting to the safety dam.
The impermeable layer is sequentially composed of a bottom geotextile, an HDPE film and a top geotextile from bottom to top.
The initial dam is a permeable rock-fill dam.
The content of particles with the particle diameter of less than 5mm in the rock-fill dam is not more than 20%, the content of particles with the particle diameter of less than 0.075mm in the rock-fill dam is not more than 5%, and the filling porosity of the rock-fill dam is 20% -25%.
The percolate collecting system comprises a percolate collecting pipe, an HDPE percolate guiding and discharging pipe and a stainless steel pipe, one end of the percolate collecting pipe is located in a landfill reservoir area at the upstream of the initial dam, the other end of the percolate collecting pipe penetrates through the initial dam and extends to the upstream of the safety dam, a water inlet of the HDPE percolate guiding and discharging pipe is located between the initial dam and the safety dam, a water outlet of the HDPE percolate guiding and discharging pipe penetrates through the safety dam and extends to a collecting tank at the downstream of the safety dam, one end of the stainless steel pipe is connected with the initial dam, and the other end of the stainless steel pipe penetrates through the safety dam and then extends to the collecting tank.
Fine sand is paved around a percolate collecting pipe in the upstream landfill reservoir area of the initial dam, graded broken stone is paved around the fine sand, and reverse-filtering geotechnical cloth is paved on the graded broken stone, wherein the shape and the size of the reverse-filtering geotechnical cloth are matched with those of the impermeable layer.
An elbow is arranged at the water inlet of the HDPE percolate guide pipe, penetrates through the impermeable layer, and is welded with the impermeable layer in the middle.
The pipe diameter of the HDPE percolate guide pipe is not smaller than 300mm.
And an annular anchoring groove is arranged on the edge of the impermeable layer on the landfill storage area and the safety dam.
A construction method of a general industrial solid waste storage and disposal site structure, the construction method mainly comprising the following steps:
(1) And (3) construction of a safety dam: digging a dam abutment and a dam foundation of the safety dam according to the dam height and the position of the safety dam, embedding HDPE percolate guide pipes and stainless steel pipes after the excavation is finished, and then filling the safety dam to a designed top elevation;
(2) And (3) constructing an initial dam foundation pit: sequentially excavating a dam foundation, pouring cushion layer concrete, pouring reinforced concrete, and pre-burying one end, close to an initial dam, of a stainless steel pipe in the reinforced concrete from bottom to top;
(3) And (3) construction of an impermeable layer: finishing the foundation of a landfill reservoir area, then paving a bottom geotextile, an HDPE film and a top geotextile in sequence from bottom to top, backfilling clay into an anchoring ditch, and compacting;
(4) Filling an initial dam: paving a geogrid on a dam foundation impermeable layer before filling, wherein one side of the geogrid, which is close to a safety dam, extends out by 1-2 m relative to an initial dam, compacting an extending part of the geogrid by using a concrete pressing block, filling a dam body, pre-burying a solid pipe section of a percolate collecting pipe when the dam body is filled to a bottom height, then performing installation work of a bottom percolate collecting pipe flower pipe section, connecting the flower pipe section with the solid pipe section, and finally paving fine sand and graded broken stone around the flower pipe section;
(5) And (3) finishing the laying of the reverse-filtering geotextile at the bottom of the reservoir in the landfill reservoir area, and laying one end, close to the initial dam, of the reverse-filtering geotextile to the dam top of the initial dam.
The invention has the beneficial effects that: the welding position of elbow and barrier is exposed between initial dam and safety dam, and it is convenient to maintain and overhaul, and in addition, the barrier around the elbow is fixed through initial dam and anchor ditch cooperation, and HDPE infiltration liquid leads the calandria to be fixed through the safety dam, and HDPE infiltration liquid leads calandria and barrier to receive geological condition and construction quality influence little, so the load that the welding position of elbow and barrier born is little, is difficult for being pulled apart, environmental protection and security risk are low. The leachate in the landfill reservoir area can be timely discharged through the rock-fill dam, so that the problem that infiltration lines in the landfill reservoir area are raised due to the accumulation of leachate in front of the dam is solved, and meanwhile, the stability of the rock-fill dam is ensured. The percolate collecting system is rigidly fixed through the initial dam and the safety dam, is little influenced by geological conditions and construction quality, and keeps good percolate collecting and guiding and draining capacity continuously.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic longitudinal section of fig. 1.
In the figure: 1-primary dam, 2-geogrid, 3-top geotextile, 4-HDPE film, 5-bottom geotextile, 6-reinforced concrete, 7-bedding concrete, 8-solid waste, 9-reverse filtration geotextile, 10-percolate collecting pipe, 11-stacked dam seepage guiding pipe, 12-concrete briquetting, 13-safety dam, 14-HDPE percolate guiding pipe, 15-stainless steel pipe, 16-anchoring ditch, 17-sewage disposal diversion intercepting ditch, 18-sewage disposal diversion pipe, 19-stacked dam roadway, 20-stacked dam intercepting ditch and 21-collecting tank.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the above.
As shown in fig. 1 and 2, a general industrial solid waste storage and disposal site structure according to the present invention includes a landfill reservoir area, an impermeable layer laid at the bottom of the landfill reservoir area, an initial dam 1 provided in the landfill reservoir area and on the impermeable layer, a safety dam 13 provided downstream of the initial dam 1 and connected to the impermeable layer at one side thereof, and a percolate collecting system collecting percolate in the landfill reservoir area and discharging the collected percolate to the downstream of the safety dam 13. When the dam is used, the safety dam 13 is an earth-rock dam, if the safety dam 13 is a rock-fill dam, the porosity of the filled dam body is not more than 28%, and if the safety dam 13 is a homogeneous earth-rock dam, the compactness is not less than 0.96, and waterproof protection measures are taken for the dam surface. And (3) performing dam break analysis on the initial dam 1 by referring to the debris flow calculation method so as to determine the dam height of the safety dam 13 and the distance between the safety dam 13 and the initial dam 1, so as to ensure that industrial solid waste does not overflow after the initial dam 1 breaks.
The impermeable layer sequentially comprises a bottom geotextile 5, an HDPE film 4 and a top geotextile 3 from bottom to top.
The initial dam 1 is a permeable rock-fill dam. In use, the height of the initial dam 1 does not exceed 10m. The leachate in the landfill reservoir area can be timely discharged through the rock-fill dam, the problem that infiltration lines in the landfill reservoir area are raised due to the fact that the leachate is deposited in front of the dam is solved, and meanwhile stability of the rock-fill dam is guaranteed.
The content of particles with the particle diameter of less than 5mm in the rock-fill dam is not more than 20%, the content of particles with the particle diameter of less than 0.075mm in the rock-fill dam is not more than 5%, and the filling porosity of the rock-fill dam is 20% -25%. The rock-fill dam has good water permeability, avoids the rise of infiltration lines in a landfill reservoir area, and also has good structural strength and stability, and avoids dam break.
The percolate collecting system comprises a percolate collecting pipe 10, an HDPE percolate guide and discharge pipe 14 and a stainless steel pipe 15, one end of the percolate collecting pipe 10 is located in a landfill reservoir area at the upstream of the initial dam 1, the other end of the percolate collecting pipe penetrates through the initial dam 1 and extends to the upstream of the safety dam 13, a water inlet of the HDPE percolate guide and discharge pipe 14 is located between the initial dam 1 and the safety dam 13, a water outlet of the HDPE percolate guide and discharge pipe penetrates through the safety dam 13 and extends to a collecting tank 21 at the downstream of the safety dam 13, one end of the stainless steel pipe 15 is connected with the initial dam 1, and the other end of the stainless steel pipe penetrates through the safety dam 13 and then extends to the collecting tank 21. In use, the percolate collection tube 10 is composed of a tube section of flowers located in a landfill reservoir upstream of the primary dam 1 and a tube section of solid pre-buried in the primary dam 1. When the liquid accumulation (groundwater or surface water) in the stainless steel pipe 15 is not contaminated, it may be directed downstream of the collection tank 21.
Fine sand is paved around a percolate collecting pipe 10 in the upstream landfill reservoir area of the initial dam 1, graded broken stone is paved around the fine sand, reverse filtering geotechnical cloth 9 is paved on the graded broken stone, and the shape and the size of the reverse filtering geotechnical cloth 9 are matched with those of an impermeable layer. When in use, the thickness of graded broken stone paved around the percolate collecting pipe 10 is not less than 1m, and the graded broken stone provides protection for the percolate collecting pipe 10 and prevents the percolate collecting pipe 10 from being damaged by the stone blocks filled in later period. Fine sand refers to particles having a particle size greater than 0.075 mm.
An elbow is arranged at the water inlet of the HDPE percolate guide pipe 14, penetrates through the impermeable layer, and is welded with the impermeable layer at the middle part. When in use, the middle part of the elbow is welded with the impermeable layer in a sealing way, so that leakage of percolate is avoided, and the water inlet of the elbow is exposed out of the ground by 10cm. The welding position of the elbow and the impermeable layer is exposed between the initial dam 1 and the safety dam 13, so that the maintenance and the overhaul are convenient; in addition, the impervious layer around the elbow is fixed through the cooperation of initial dam 1 and anchor ditch 16, HDPE infiltration liquid guide and discharge pipe 14 is fixed through safety dam 13, HDPE infiltration liquid guide and discharge pipe 14 and impervious layer receive geological conditions and construction quality influence little, so the load that the welded position of elbow and impervious layer born is little, is difficult for being pulled apart, has improved the prevention of seepage reliability of structure, and environmental protection and security risk are low.
The pipe diameter of the HDPE percolate guide pipe 14 is not smaller than 300mm. In use, the HDPE filtrate conduit pipe 14 has a radial wall ratio (SDR) of 13.6, and the filtrate is conducted through the HDPE filtrate conduit pipe 14 into the collection tank 21 in time.
The edge of the impermeable layer on the landfill storage area and the safety dam 13 is provided with an annular anchoring groove 16. The edge of the barrier layer is secured by the anchoring groove 16.
A construction method of a general industrial solid waste storage and disposal site structure, the construction method mainly comprising the following steps:
(1) And (3) construction of a safety dam: and excavating a dam abutment and a dam foundation of the safety dam 13 according to the dam height and the position of the safety dam 13, embedding the HDPE percolate guide and discharge pipes 14 and the stainless steel pipes 15 after the excavation is finished, and filling the safety dam 13 to the designed top elevation.
(2) And (3) constructing an initial dam foundation pit: sequentially excavating a dam foundation, pouring cushion concrete 7 and pouring reinforced concrete 6 from bottom to top, and embedding one end, close to the initial dam 1, of a stainless steel pipe 15 in the reinforced concrete 6; when the dam is used, the depth of the foundation pit of the initial dam 1 is not less than 2m, the end part of the stainless steel tube 15 is forbidden to extend out of the surface of the reinforced concrete 6, namely, the port of the stainless steel tube 15 coincides with the inner surface of the reinforced concrete 6, so that the anti-seepage layer is prevented from being scratched.
(3) And (3) construction of an impermeable layer: the foundation of the landfill reservoir area is trimmed, and then the bottom geotextile 5, the HDPE film 4 and the top geotextile 3 are paved in sequence from bottom to top, and clay is backfilled into the anchoring groove 16 and compacted.
(4) Filling an initial dam: paving a geogrid 2 on a dam foundation impermeable layer before filling, wherein one side, close to a safety dam 13, of the geogrid 2 extends out for 1-2 m relative to an initial dam 1, compacting the extending part of the geogrid 2 by using a concrete pressing block 12, filling a dam body, embedding a solid pipe section of a percolate collecting pipe 10 when the dam body is filled to a bottom height, installing a flower pipe section of the bottom percolate collecting pipe 10, connecting the flower pipe section with the solid pipe section, and finally paving fine sand and graded broken stone around the flower pipe section; the geogrid 2 is taken according to GB/T17689-2008, the material is high-density polyethylene, and the tensile strength is not lower than 120kN/m.
(5) And (3) finishing the laying of the reverse-filtering geotextile 9 at the bottom of the reservoir in the landfill reservoir area, and laying one end, close to the initial dam 1, of the reverse-filtering geotextile 9 to the dam top of the initial dam 1.
In summary, the welding position of the elbow and the impermeable layer is exposed between the initial dam 1 and the safety dam 13, so that maintenance and overhaul are convenient, in addition, the impermeable layer around the elbow is matched and fixed through the initial dam 1 and the anchoring groove 16, the HDPE percolate guide and discharge pipe 14 is fixed through the safety dam 13, and the HDPE percolate guide and discharge pipe 14 and the impermeable layer are little influenced by geological conditions and construction quality, so that the load borne by the welding position of the elbow and the impermeable layer is little, the elbow and the impermeable layer are not easy to crack, and the environment-friendly and safe risks are low. The leachate in the landfill reservoir area can be timely discharged through the rock-fill dam, so that the problem that infiltration lines in the landfill reservoir area are raised due to the accumulation of leachate in front of the dam is solved, and meanwhile, the stability of the rock-fill dam is ensured. The percolate collecting system is rigidly fixed through the initial dam 1 and the safety dam 13, is little influenced by geological conditions and construction quality, and keeps good percolate collecting and guiding and draining capacity continuously.
Examples:
the thickness of the cushion layer concrete 7 is 10cm, and the strength grade of the concrete is C15; the thickness of the reinforced concrete 6 was 30cm and the concrete strength grade was C20. The specification of the bottom geotextile 5 is 600g/m2, the specification of the top geotextile 3 is 600g/m2, and the specification of the reverse filtering geotextile 9 is 300g/m2. The stainless steel pipe 5 is made of 316L and has a pipe diameter phi of 100. The dimensions of the concrete compact 12 are 20cm by 10cm. The pile stones on the slag-facing surface of the initial dam 1 should be laid flat to prevent sharp contours from puncturing the reverse-filtering geotextile 9. The landfill storage area and the safety dam 13 are respectively provided with a water interception ditch, the two water interception ditches are mutually communicated to integrally form an annular sewage disposal diversion water interception ditch 17, and the edge of the impermeable layer is paved to the elevation of the sewage disposal diversion water interception ditch 17. The section 17 of the sewage-cleaning diversion intercepting ditch on the safety dam 13 is communicated with the water inlet of the sewage-cleaning diversion pipe 18, and the water outlet of the sewage-cleaning diversion pipe 18 penetrates through the safety dam 13 and extends to the downstream of the safety dam 13. Solid waste 8 is accumulated in a landfill reservoir area at the upstream of the initial dam 1, a dam seepage guide pipe 11 is arranged in and on the solid waste 8, and a water outlet of the dam seepage guide pipe 11 extends to an elbow installation position. A dam catwalk 19 is also built on the solid waste 8 dam. An annular dam intercepting ditch 20 is built on the outer sides of the solid waste 8 dam, the preliminary dam 1 and the safety dam 13, and the water outlet of the dam intercepting ditch 20 extends to the downstream of the collecting tank 21.
Claims (3)
1. A construction method of a general industrial solid waste storage and disposal site structure is characterized by comprising the following steps: the general industrial solid waste storage and disposal site structure comprises a landfill reservoir area, an impermeable layer, an initial dam (1), a safety dam (13) and a percolate collecting system, wherein the impermeable layer is paved at the bottom of the landfill reservoir area, the initial dam (1) is arranged in the landfill reservoir area and is positioned on the impermeable layer, the safety dam (13) is arranged at the downstream of the initial dam (1), one side of the safety dam is connected with the impermeable layer, and the percolate collecting system is used for collecting percolate in the landfill reservoir area and discharging the collected percolate to the downstream of the safety dam (13);
the impermeable layer sequentially comprises a bottom geotextile (5), an HDPE film (4) and a top geotextile (3) from bottom to top;
the initial dam (1) is a permeable rock-fill dam;
the content of particles with the particle diameter of less than 5mm in the rock-fill dam is not more than 20%, the content of particles with the particle diameter of less than 0.075mm in the rock-fill dam is not more than 5%, and the filling porosity of the rock-fill dam is 20% -25%;
the percolate collecting system comprises a percolate collecting pipe (10), an HDPE percolate guide and discharge pipe (14) and a stainless steel pipe (15), wherein one end of the percolate collecting pipe (10) is positioned in a landfill reservoir area at the upstream of the initial dam (1), the other end of the percolate collecting pipe penetrates through the initial dam (1) and extends to the upstream of the safety dam (13), a water inlet of the HDPE percolate guide and discharge pipe (14) is positioned between the initial dam (1) and the safety dam (13), a water outlet of the HDPE percolate guide and discharge pipe penetrates through the safety dam (13) and extends into a collecting tank (21) at the downstream of the safety dam (13), one end of the stainless steel pipe (15) is connected with the initial dam (1), and the other end of the stainless steel pipe penetrates through the safety dam (13) and then extends into the collecting tank (21);
fine sand is paved around a percolate collecting pipe (10) in an upstream landfill reservoir area of the initial dam (1), graded broken stone is paved around the fine sand, reverse filtering geotechnical cloth (9) is paved on the graded broken stone, and the shape and the size of the reverse filtering geotechnical cloth (9) are matched with those of an impermeable layer;
an annular anchoring groove (16) is formed in the landfill warehouse area and the safety dam (13) along the edge of the impermeable layer;
the construction method of the general industrial solid waste storage and disposal site structure comprises the following steps:
(1) And (3) construction of a safety dam: digging a dam abutment and a dam foundation of the safety dam (13) according to the dam height and the position of the safety dam, embedding HDPE percolate guide pipes (14) and stainless steel pipes (15) after the excavation is finished, and then filling the safety dam (13) to a designed top elevation;
(2) And (3) constructing an initial dam foundation pit: sequentially excavating a dam foundation, pouring cushion concrete (7) and pouring reinforced concrete (6) from bottom to top, and embedding one end, close to the initial dam (1), of a stainless steel tube (15) in the reinforced concrete (6);
(3) And (3) construction of an impermeable layer: finishing the foundation of a landfill reservoir area, then paving a bottom geotextile (5), an HDPE film (4) and a top geotextile (3) in sequence from bottom to top, backfilling clay into an anchoring ditch (16) and compacting;
(4) Filling an initial dam: paving a geogrid (2) on a dam foundation impermeable layer before filling, wherein one side, close to a safety dam (13), of the geogrid (2) extends for 1-2 m relative to an initial dam (1), compacting the extending part of the geogrid (2) by using a concrete pressing block (12), then filling a dam body, embedding a solid pipe section of a percolate collecting pipe (10) when the dam body is filled to a bottom elevation, then performing installation work of a flower pipe section of the bottom percolate collecting pipe (10), connecting the flower pipe section with the solid pipe section, and finally paving fine sand and graded broken stone around the flower pipe section;
(5) And (3) finishing the laying of the reverse-filtering geotextile (9) at the bottom of the reservoir in the landfill reservoir area, and laying one end, close to the initial dam (1), of the reverse-filtering geotextile (9) to the dam top of the initial dam (1).
2. A method of constructing a generally industrial solid waste storage and disposal site structure as claimed in claim 1, wherein: an elbow is arranged at the water inlet of the HDPE percolate guide pipe (14), penetrates through the impermeable layer, and is welded with the impermeable layer in the middle.
3. A method of constructing a generally industrial solid waste storage and disposal site structure as claimed in claim 1, wherein: the pipe diameter of the HDPE percolate guide pipe (14) is not smaller than 300mm.
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| CN111335363B (en) * | 2020-03-05 | 2021-11-12 | 中钢集团马鞍山矿山研究总院股份有限公司 | New method for storing and disposing general industrial solid waste |
| CN112081144B (en) * | 2020-08-10 | 2021-06-25 | 中国矿业大学(北京) | Bottom composite stable layer structure of heavy metal tailing pond and construction method |
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