CN114525817A - Construction method of horizontal seepage-proofing and vertical seepage-proofing combined structure - Google Patents
Construction method of horizontal seepage-proofing and vertical seepage-proofing combined structure Download PDFInfo
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- 239000002131 composite material Substances 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 15
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- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 230000002265 prevention Effects 0.000 abstract description 13
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- 238000003723 Smelting Methods 0.000 description 2
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- 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
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
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- 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
- E02D31/004—Sealing liners
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/14—Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/108—Rainwater harvesting
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- Hydrology & Water Resources (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
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Abstract
The invention discloses a construction method of a horizontal seepage-proofing and vertical seepage-proofing combined structure, wherein the adopted combined seepage-proofing structure comprises a vertical seepage-proofing wall (10), a composite seepage-proofing engineering structure (12), a horizontal seepage-proofing system and a filtering drainage system; the composite seepage-proofing engineering structure (12) is composed of a vertical seepage-proofing inner wall (12-1), an inner wall covering plate (12-3) which is positioned at the upper part of the vertical seepage-proofing inner wall and extends to one side of a solid waste storage yard/polluted site, a vertical seepage-proofing outer wall (12-2) and an outer wall covering plate (12-4) which is positioned at the upper part of the vertical seepage-proofing outer wall and extends outwards; the horizontal seepage-proofing system is composed of a base layer (5), a seepage-proofing material protection layer (4), a horizontal seepage-proofing layer (3), an ecological base layer (2) and an ecological layer (1) from bottom to top. The invention meets the technological requirements of horizontal seepage prevention and vertical seepage prevention, realizes the greening and beautifying of the solid waste storage yard/polluted site, has smooth drainage and excellent drainage water quality, not only saves clay resources and reduces the using amount of earthwork, but also has simple and convenient construction, low cost and good effect.
Description
Technical Field
The invention belongs to the technical field of seepage-proofing engineering construction for pollution prevention and control, and particularly relates to a construction method with a horizontal seepage-proofing and vertical seepage-proofing combined structure, which can be widely applied to the fields of ecological restoration of polluted sites, in-situ treatment of solid wastes, leakage collection of wastewater, water quality protection of riverways and the like, and is more suitable for solid waste stockpiling sites requiring simultaneous horizontal seepage-proofing and vertical seepage-proofing requirements.
Background
For historical reasons, a large amount of solid wastes, such as steel slag of steel mills, copper smelting waste slag, stripped waste rock (soil) produced in mining, and the like, are produced in the production process of many enterprises, a large amount of solid wastes are stockpiled for a long time to form solid waste stockpiling places such as a slag dressing and smelting place and a waste dump, and rainwater enters the solid waste stockpiling places to produce harmful waste water, and then the harmful waste water enters underground water or leaks out to seriously affect the safety of a local water system, destroy soil quality, influence plant growth and destroy the local environmental quality.
Currently, the main methods for disposing of these solid wastes are: the method comprises the steps of filling in different places, piling in place and curing in place, and the adopted seepage-proofing method comprises horizontal seepage-proofing and vertical seepage-proofing.
The remote landfill is feasible under the conditions of environmental protection, safety and reliability for only a small amount of solid waste; for historical reasons, in-situ management is also a practical approach for large amounts of existing solid waste.
The horizontal seepage prevention is to establish an impervious layer in the horizontal direction on the surface of the solid waste storage yard to prevent rainwater or external fresh water from entering the solid waste storage yard below, so as to prevent the pollution of the solid waste to generate new waste water to pollute the underground water.
The vertical seepage prevention is to establish a vertical barrier (a seepage wall) around a solid waste storage yard or in a certain depth range of the downstream of underground water flow to prevent polluted water from diffusing and migrating to other water areas to pollute the surrounding water areas.
At present, vertical seepage-proofing and horizontal seepage-proofing treatment of waste water generated by solid waste is respectively carried out, and the construction method adopting vertical seepage-proofing and horizontal seepage-proofing measures respectively has the disadvantages of long construction period, complex construction and high cost. How to combine the horizontal seepage prevention with the vertical seepage prevention and construct a combined structure system of the horizontal seepage prevention and the vertical seepage prevention together has important significance for saving clay resources, reducing the using amount of earthwork, simplifying construction procedures and improving seepage prevention effect.
Disclosure of Invention
The invention aims to solve the problems of poor seepage-proofing effect, long construction period, complex construction process and high cost in the prior art, and provides a construction method of a horizontal seepage-proofing and vertical seepage-proofing combined structure, which can save clay resources, reduce the using amount of earthwork, is simple and convenient to construct, has low construction cost and good seepage-proofing effect.
In order to realize the purpose, the construction method of the horizontal seepage-proofing and vertical seepage-proofing combined structure is implemented by adopting the following technical scheme:
the combined seepage-proofing structure adopted by the construction method of the horizontal seepage-proofing and vertical seepage-proofing combined structure comprises a vertical seepage-proofing wall, a composite seepage-proofing engineering structure, a horizontal seepage-proofing system and a filtering drainage system; the composite seepage-proofing engineering structure consists of a vertical seepage-proofing inner wall, an inner wall covering plate, a vertical seepage-proofing outer wall and an outer wall covering plate, wherein the upper part of the vertical seepage-proofing inner wall extends to one side of the solid waste storage yard/polluted site; the vertical impervious wall is positioned at the lower part between the vertical impervious inner wall and the vertical impervious outer wall, a vertical impervious combined layer is arranged at the bottom between the vertical impervious inner wall and the vertical impervious outer wall, and a concave space formed by the vertical impervious inner wall, the vertical impervious outer wall and the vertical impervious combined layer is a horizontal impervious rainwater collection and drainage space; the horizontal seepage-proofing system is positioned on the original base layer on one side of the vertical seepage-proofing inner wall close to the solid waste storage yard/polluted site, and the horizontal seepage-proofing system is formed by combining a base layer, a seepage-proofing material protective layer, a horizontal seepage-proofing layer, an ecological base layer and an ecological layer from bottom to top; drain holes are arranged in the vertical anti-seepage inner wall at intervals, an anti-filtration layer and a filtration layer are sequentially arranged at the inlet of the drain hole, the outlet of the drain hole is discharged to the horizontal anti-seepage rainwater collecting and discharging space, the anti-filtration layer, the drain hole and the horizontal anti-seepage rainwater collecting and discharging space jointly form a filtration and drainage system, and the size of the horizontal anti-seepage rainwater collecting and discharging space is determined according to regional environment improvement and rainwater collection and discharge calculation; the construction method comprises the following steps:
1) defining a vertical seepage-proofing line at the outer edge of the solid waste storage yard/polluted site needing horizontal seepage proofing and vertical seepage proofing, and leveling the original base course of the solid waste storage yard/polluted site according to the design elevation and gradient requirements;
2) constructing a composite anti-seepage engineering structure according to the position of the vertical anti-seepage line; the composite seepage-proofing engineering structure is of a reinforced concrete structure and is formed by formwork erection, reinforcement binding and concrete pouring; the drain hole and the vertical impervious inner wall are constructed synchronously;
3) to be compoundedAfter the seepage-proofing engineering structure is stable and accepted, constructing a vertical seepage-proofing wall, wherein the vertical seepage-proofing wall adopts plain concrete or a triaxial cement mixing pile or a high-pressure jet grouting pile; the depth of the vertical impervious wall needs to reach the permeability coefficient less than 1x10-7And the penetration coefficient of the penetration resisting layer is less than 1x10-7The thickness of the impermeable soil layer is not less than 1000 mm;
4) constructing a foundation layer and an impermeable material protective layer: the foundation layer adopts miscellaneous filling soil, and is compacted in a layering way, and the compaction density is not less than 0.95; the impervious material protective layer adopts plain soil, is leveled and compacted, and the plain soil cannot contain organic matters, broken stones, grass sawdust and other impurities;
5) constructing a reverse filter layer, wherein the reverse filter layer is a circular reverse filter layer and internally contains graded broken stones and is externally coated with geotextile;
6) constructing a filtering layer, wherein the filtering layer adopts coarse sand and is arranged around the circular reverse filtering layer; the coarse sand is more than 85 percent of particles with the particle size of more than 0.075 mm;
7) laying a horizontal impermeable layer, wherein the horizontal impermeable layer adopts a high-density polyethylene HDPE geotechnical impermeable film and is added with a geotechnical cloth protective layer;
8) constructing an ecological base layer, wherein the ecological base layer adopts planting soil, plants are planted on the planting soil to form an ecological layer, and plant varieties are determined according to the requirements of regional ecological environment protection and greening;
9) and constructing a vertical anti-seepage combination layer, wherein the vertical anti-seepage combination layer is made of plain concrete.
Furthermore, horizontal cover plates are arranged on the vertical anti-seepage inner wall and the vertical anti-seepage outer wall, the horizontal cover plates are concrete cover plates, and the horizontal cover plates are provided with grid holes.
By combining the anti-seepage effect and the construction cost and through test research results and comparison, the thickness B1 of the vertical anti-seepage inner wall and the vertical anti-seepage outer wall is preferably in the range of 150-200 mm; the thickness B2 of the vertical impervious wall is preferably within the range of 600 mm-800 mm, and the thickness of the vertical impervious wall needs to meet the requirement that the permeability coefficient is less than 1x10-7And the depth is ensured to meet the design requirement; the thickness H3 of the inner wall covering plate and the outer wall covering plate is generally in the range of 150-200 mm, and the height H4 of the vertical anti-seepage inner wall and the vertical anti-seepage outer wall is in the range of 1300-1800 mm.
Further, the thickness of the base layer is 400-600 mm, and the thickness of each layer of the layered and compacted layer is not more than 200 mm; the thickness of the impermeable material protective layer is 150-250 mm.
Furthermore, the diameter of the circular anti-filter layer is within the range of 360-450 mm, and the upper and lower heights of the circular anti-filter layer are respectively required to be not less than 80mm below the inlet of the drain hole and not less than 80mm above the inlet of the drain hole; the thickness of the filter layer is 420-560 mm; the thickness of the ecological base layer is 420-560 mm.
Further, the horizontal impermeable layer is a high density polyethylene HDPE geomembrane with the thickness of 1.5 mm.
After the technical scheme is adopted, the construction method of the horizontal seepage-proofing and vertical seepage-proofing combined structure has the following positive effects:
(1) the combined seepage-proofing structure consisting of the vertical seepage-proofing wall, the composite seepage-proofing engineering structure, the horizontal seepage-proofing system and the filtering drainage system is adopted, so that the combined seepage-proofing structure simultaneously meets the process requirements of horizontal seepage-proofing and vertical seepage-proofing, and the perfect combination of horizontal seepage-proofing and vertical seepage-proofing is realized;
(2) the horizontal seepage-proofing system is formed by combining a base layer, a seepage-proofing material protective layer, a horizontal seepage-proofing layer, an ecological base layer and an ecological layer from bottom to top, can meet the requirement of horizontal seepage proofing of the solid waste storage yard/polluted site, restores the ecology of the solid waste storage yard/polluted site and realizes greening and beautifying of the solid waste storage yard/polluted site;
(3) the vertical seepage-proofing system is formed by combining a vertical seepage-proofing wall positioned at the bottom, a vertical seepage-proofing inner wall and a vertical seepage-proofing outer wall double-layer structure positioned at the upper part and a vertical seepage-proofing binding layer, and has good vertical seepage-proofing effect and convenient construction;
(4) the reverse filtering layer, the drain hole and the horizontal seepage-proof rainwater collecting and discharging space form a filtering and draining system together, so that draining is smooth, and draining water quality is excellent.
(5) The invention adopts sinking type horizontal seepage prevention, namely: rainwater permeates to the horizontal impermeable layer through the ecological layer and the ecological base layer, then flows downwards along the filter layer, the inverted filter layer and the drainage hole through the horizontal impermeable layer to the horizontal impermeable rainwater collecting and discharging space to be discharged; the sinking type horizontal seepage-proofing and vertical seepage-proofing combined structure not only saves clay resources and reduces the using amount of earthwork, but also is a method with simple and convenient construction, low cost and good effect.
Drawings
FIG. 1 is a sectional view of a combined impermeable structure designed by the construction method of the horizontal impermeable and vertical impermeable combined structure of the invention.
Reference numerals: 1-ecological layer; 2-ecological base course; 3-horizontal barrier layer; 4-a barrier material protective layer; 5-a base layer; 6-original base layer (namely surface layer of solid waste storage yard/polluted site); 7-a drain hole; 8-an inverted filter layer; 9-a filter layer; 10-vertical impervious wall; 11-a vertical impermeable bonding layer; 12-composite seepage-proofing engineering structure; 12-1-vertical impervious inner wall; 12-2-vertical impermeable exterior walls; 12-3-interior wall cladding panel; 12-4-exterior wall cladding; 13-horizontal seepage-proof rainwater collection and drainage space; 14 horizontal cover plate.
Detailed Description
For further description of the present invention, the construction method of the horizontal anti-seepage and vertical anti-seepage combined structure of the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1, the sectional view of the combined impermeable structure designed by the construction method of the horizontal impermeable and vertical impermeable combined structure of the invention shows, the construction method of the horizontal impermeable and vertical impermeable combined structure of the invention adopts the combined impermeable structure comprising a vertical impermeable wall 10, a composite impermeable engineering structure 12, a horizontal impermeable system, a filtering drainage system and a horizontal cover plate 14; the composite seepage-proofing engineering structure 12 consists of a vertical seepage-proofing inner wall 12-1, an inner wall covering plate 12-3 which is positioned at the upper part of the vertical seepage-proofing inner wall and extends to one side of a solid waste storage yard/polluted site, a vertical seepage-proofing outer wall 12-2 and an outer wall covering plate 12-4 which is positioned at the upper part of the vertical seepage-proofing outer wall and extends outwards; the vertical impervious wall 10 is positioned at the lower part between the vertical impervious inner wall 12-1 and the vertical impervious outer wall 12-2, a vertical impervious combined layer 11 is arranged at the bottom between the vertical impervious inner wall 12-1 and the vertical impervious outer wall 12-2, and a concave space formed by the vertical impervious inner wall 12-1, the vertical impervious outer wall 12-2 and the vertical impervious combined layer 11 is a horizontal impervious rainwater collecting and discharging space 13; the horizontal cover plate 14 is a concrete cover plate, and the horizontal cover plate 14 covers the vertical impermeable inner wall 12-1 and the vertical impermeable outer wall 12-2; the horizontal seepage-proofing system is positioned on an original base layer 6 on one side of a vertical seepage-proofing inner wall 12-1 close to the solid waste storage yard/polluted site, and the horizontal seepage-proofing system is composed of a base layer 5, a seepage-proofing material protective layer 4, a horizontal seepage-proofing layer 3, an ecological base layer 2 and an ecological layer 1 from bottom to top; the vertical anti-seepage inner wall 12-1 is internally provided with drain holes 7 at intervals, the inlet of each drain hole 7 is sequentially provided with an inverted filter layer 8 and a filter layer 9, the outlet of each drain hole 7 is discharged to a horizontal anti-seepage rainwater collecting and discharging space 13, the inverted filter layer 8, the filter layer 9, the drain holes 7 and the horizontal anti-seepage rainwater collecting and discharging space 13 jointly form a filtering and draining system, and the size of the horizontal anti-seepage rainwater collecting and discharging space 13 is determined according to regional environment regulation and rainwater collecting and discharging calculation.
The technical parameters of the combined impermeable structure adopted in the embodiment are as follows:
the thickness B1 of the vertical impervious inner wall 12-1 and the vertical impervious outer wall 12-2 is 150-200 mm, the thickness B2 of the vertical impervious wall 11 is 600-800 mm, the thickness H3 of the inner wall covering plate 12-3 and the outer wall covering plate 12-4 is 150-200 mm, and the height H4 of the vertical impervious inner wall 12-1 and the vertical impervious outer wall 12-2 is 1300-1800 mm; the thickness of the base layer 5 is 500mm, and the thickness of each layer compacted in a layering way is not more than 200 mm; the thickness of the impervious material protection layer 4 is 200 mm; the diameter of the circular anti-filtering layer is in the range of 400 mm; the thickness of the filter layer 9 is 500 mm; the thickness of the ecological base layer 2 is 500 mm; the horizontal impermeable layer 3 is a high density polyethylene HDPE earth impermeable film with the thickness of 1.5 mm; the upper and lower heights of the circular reverse filter layer also meet the requirement that the circular reverse filter layer is respectively positioned 100mm below the inlet of the drain hole and 100mm above the inlet of the drain hole.
The construction method comprises the following steps:
1) the method comprises the steps of defining a vertical seepage-proofing line at the outer edge of a solid waste storage yard/polluted site needing horizontal seepage proofing and vertical seepage proofing, and leveling the original base layer 6 of the solid waste storage yard/polluted site according to the design elevation and gradient requirements;
2) constructing a composite anti-seepage engineering structure 12 according to the position of the vertical anti-seepage line; the composite seepage-proofing engineering structure 12 is formed by adopting a reinforced concrete structure, erecting a formwork, binding reinforcing steel bars and then pouring concrete; the drain hole 7 and the vertical impervious inner wall 12-1 are constructed synchronously; the composite seepage-proofing engineering structure 12 is of a reinforced concrete structure, and the diameter of a steel bar in concrete is 14mm, and the distance between the steel bars is 200 mm; the drain holes 7 are pre-buried phi 100 plastic steel pipes with the spacing of 2000mm, and the vertical positions are determined according to the design;
3) after the composite seepage-proofing engineering structure 12 is stable and accepted, constructing the vertical seepage-proofing wall 10, wherein the vertical seepage-proofing wall 10 adopts C15 plain concrete or a triaxial cement mixing pile or a high-pressure jet grouting pile;
4) constructing a foundation layer 5 and an impermeable material protection layer 4: the foundation layer 5 adopts miscellaneous filling soil, and is compacted in layers; the impervious material protective layer 4 is made of plain soil, and is leveled and compacted;
5) constructing a reverse filter layer 8, wherein the reverse filter layer 8 is a circular reverse filter layer, contains graded broken stones and is externally coated with geotextile;
6) constructing a filter layer 9, wherein the filter layer 9 is made of coarse sand and is distributed around the circular reverse filter layer;
7) laying a horizontal impermeable layer 3, wherein the horizontal impermeable layer 3 adopts a high-density polyethylene HDPE geotechnical impermeable film, and a geotechnical cloth protective layer is added;
8) constructing an ecological base layer 2, wherein the ecological base layer 2 adopts planting soil, plants are planted on the planting soil to form an ecological layer 1, and plant varieties are determined according to the requirements of regional ecological environment protection and greening;
9) constructing a vertical anti-seepage combination layer 11, wherein the vertical anti-seepage combination layer 11 is made of plain concrete;
10) and finishing the manufacturing and installation of the horizontal cover plate 14.
Test verification shows that compared with the method of respectively adopting horizontal seepage prevention and vertical seepage prevention, the method can save the civil engineering cost by more than 30 percent, and simultaneously can effectively save the land use area, thereby saving land resources.
The invention is suitable for solid waste piles in different shapes, such as ground, pits and mountain depressions, and is particularly suitable for the condition that the ground is required to be flat.
Claims (9)
1. A construction method of a horizontal seepage-proofing and vertical seepage-proofing combined structure is characterized by comprising the following steps: the adopted combined impervious structure comprises a vertical impervious wall (10), a composite impervious engineering structure (12), a horizontal impervious system and a filtering drainage system; the composite seepage-proofing engineering structure (12) is composed of a vertical seepage-proofing inner wall (12-1), an inner wall covering plate (12-3) which is positioned at the upper part of the inner wall and extends to one side of a solid waste storage yard/polluted site, a vertical seepage-proofing outer wall (12-2) and an outer wall covering plate (12-4) which is positioned at the upper part of the outer wall and extends outwards; the vertical impervious wall (10) is positioned at the lower part between the vertical impervious inner wall (12-1) and the vertical impervious outer wall (12-2), a vertical impervious binding layer (11) is arranged at the bottom between the vertical impervious inner wall (12-1) and the vertical impervious outer wall (12-2), and a concave space formed by the vertical impervious inner wall (12-1), the vertical impervious outer wall (12-2) and the vertical impervious binding layer (11) is a horizontal impervious rainwater collection and drainage space (13); the horizontal seepage-proofing system is positioned on an original base layer (6) on one side of a vertical seepage-proofing inner wall (12-1) close to the solid waste storage yard/polluted site, and the horizontal seepage-proofing system is formed by combining a base layer (5), a seepage-proofing material protective layer (4), a horizontal seepage-proofing layer (3), an ecological base layer (2) and an ecological layer (1) from bottom to top; drainage holes (7) are arranged in the vertical anti-seepage inner wall (12-1) at intervals, a reverse filter layer (8) and a filter layer (9) are sequentially arranged at the inlet of the drainage hole (7), the outlet of the drainage hole (7) is discharged to the horizontal anti-seepage rainwater collecting and discharging space (13), the reverse filter layer (8), the filter layer (9), the drainage hole (7) and the horizontal anti-seepage rainwater collecting and discharging space (13) jointly form a filtering and discharging system, and the size of the horizontal anti-seepage rainwater collecting and discharging space (13) is determined according to regional environment regulation and rainwater collecting and discharging calculation; the construction method comprises the following steps:
1) the method comprises the steps of defining a vertical seepage-proofing line at the outer edge of a solid waste storage yard/polluted site needing horizontal seepage proofing and vertical seepage proofing, and leveling the site of an original base layer (6) of the solid waste storage yard/polluted site according to the design elevation and gradient requirements;
2) constructing a composite anti-seepage engineering structure (12) according to the position of the vertical anti-seepage line; the composite seepage-proofing engineering structure (12) is of a reinforced concrete structure and is formed by erecting a formwork, binding reinforcing steel bars and then pouring concrete; the drain hole (7) and the vertical impervious inner wall (12-1) are constructed synchronously;
3) after the composite seepage-proofing engineering structure (12) is stably checked and accepted, constructing a vertical seepage-proofing wall (10), wherein the vertical seepage-proofing wall (10) adopts plain concrete or a triaxial cement mixing pile or a high-pressure jet grouting pile;
4) constructing a foundation layer (5) and an impermeable material protective layer (4): the foundation layer (5) adopts miscellaneous filling soil and is compacted in layers; the impervious material protective layer (4) adopts plain soil, and is leveled and compacted;
5) constructing a reverse filter layer (8), wherein the reverse filter layer (8) adopts a round reverse filter layer, graded broken stones are contained in the round reverse filter layer, and geotextile is coated outside the round reverse filter layer;
6) constructing a filter layer (9), wherein the filter layer (9) adopts coarse sand and is arranged around the circular reverse filter layer;
7) laying a horizontal impermeable layer (3), wherein the horizontal impermeable layer (3) adopts a high-density polyethylene HDPE geotechnical impermeable film, and is added with a geotechnical cloth protective layer;
8) constructing an ecological base layer (2), wherein the ecological base layer (2) adopts planting soil, plants are planted on the planting soil to form an ecological layer (1), and plant varieties are determined according to the requirements of regional ecological environment protection and greening;
9) and constructing a vertical anti-seepage binding layer (11), wherein the vertical anti-seepage binding layer (11) is made of plain concrete.
2. The construction method of the horizontal seepage-proofing and vertical seepage-proofing combined structure as claimed in claim 1, wherein: the adopted combined anti-seepage structure further comprises a horizontal cover plate (14), the horizontal cover plate (14) is a concrete cover plate, and the horizontal cover plate (14) covers the vertical anti-seepage inner wall (12-1) and the vertical anti-seepage outer wall (12-2).
3. The construction method of the horizontal seepage-proofing and vertical seepage-proofing combined structure as claimed in claim 2, wherein: the thickness B1 of the vertical impervious inner wall (12-1) and the vertical impervious outer wall (12-2) is 150-200 mm, the thickness B2 of the vertical impervious wall (11) is 600-800 mm, the thickness H3 of the inner wall covering plate (12-3) and the outer wall covering plate (12-4) is 150-200 mm, and the height H4 of the vertical impervious inner wall (12-1) and the vertical impervious outer wall (12-2) is 1300-1800 mm.
4. The construction method of the horizontal seepage-proofing and vertical seepage-proofing combined structure as claimed in claim 3, wherein: the thickness of the base layer (5) is 400-600 mm, and the thickness of each layer of the layered and compacted layer is not more than 200 mm; the thickness of the impermeable material protection layer (4) is 150-250 mm.
5. The construction method of the horizontal seepage-proofing and vertical seepage-proofing combined structure as claimed in claim 1, 2, 3 or 4, characterized in that: the diameter of the circular anti-filter layer is within the range of 360-450 mm.
6. The construction method of the horizontal seepage-proofing and vertical seepage-proofing combined structure as claimed in claim 5, wherein: the thickness of the filter layer (9) is 420-560 mm.
7. The construction method of the horizontal seepage-proofing and vertical seepage-proofing combined structure as claimed in claim 6, wherein: the thickness of the ecological base layer (2) is 420-560 mm.
8. The construction method of the horizontal seepage-proofing and vertical seepage-proofing combined structure as claimed in claim 7, wherein: the horizontal impermeable layer (3) is a high-density polyethylene HDPE geotechnical impermeable film with the thickness of 1.5 mm.
9. The construction method of the horizontal seepage-proofing and vertical seepage-proofing combined structure as claimed in claim 8, wherein: the upper and lower heights of the circular reverse filter layer are required to be respectively not less than 80mm below the inlet of the drain hole and not less than 80mm above the inlet of the drain hole.
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| KR101097379B1 (en) * | 2010-12-16 | 2011-12-23 | 주식회사 서영엔지니어링 | Revetment for preventing waterleakage and construction method thereof |
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| KR101769417B1 (en) * | 2017-04-10 | 2017-08-30 | (주)케이엘 | Hybrid cut off wall grouting method by pre-treatment and post-treatment |
| CN111335362A (en) * | 2020-03-05 | 2020-06-26 | 中钢集团马鞍山矿山研究总院股份有限公司 | Structural arrangement mode of common industrial solid waste storage place |
| CN213329125U (en) * | 2020-08-28 | 2021-06-01 | 河北省水利水电勘测设计研究院 | Sealed anti-seepage structure of landfill of polluted pit and pond |
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2022
- 2022-02-11 CN CN202210130131.6A patent/CN114525817B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101097379B1 (en) * | 2010-12-16 | 2011-12-23 | 주식회사 서영엔지니어링 | Revetment for preventing waterleakage and construction method thereof |
| CN106801442A (en) * | 2017-03-10 | 2017-06-06 | 中国电建集团北京勘测设计研究院有限公司 | For the highly-breathable horizontal leakage preventing composite drainage material of stone cultural artifact protection |
| KR101769417B1 (en) * | 2017-04-10 | 2017-08-30 | (주)케이엘 | Hybrid cut off wall grouting method by pre-treatment and post-treatment |
| CN111335362A (en) * | 2020-03-05 | 2020-06-26 | 中钢集团马鞍山矿山研究总院股份有限公司 | Structural arrangement mode of common industrial solid waste storage place |
| CN213329125U (en) * | 2020-08-28 | 2021-06-01 | 河北省水利水电勘测设计研究院 | Sealed anti-seepage structure of landfill of polluted pit and pond |
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