CN114525817B - 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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- 238000003860 storage Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 15
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- 229920001903 high density polyethylene Polymers 0.000 claims description 12
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- 241000196324 Embryophyta Species 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
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- 239000004568 cement Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 238000009415 formwork Methods 0.000 claims description 3
- 239000004746 geotextile Substances 0.000 claims description 3
- 238000005067 remediation Methods 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 abstract description 26
- 230000000694 effects Effects 0.000 abstract description 7
- 239000004927 clay Substances 0.000 abstract description 4
- 239000003657 drainage water Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
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Classifications
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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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Hydrology & Water Resources (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Health & Medical Sciences (AREA)
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- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a construction method of a horizontal seepage-proofing and vertical seepage-proofing combined structure, which adopts the combined seepage-proofing structure comprising 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 impermeable engineering structure (12) is composed of a vertical impermeable inner wall (12-1), an inner wall covering plate (12-3) which is arranged at the upper part of the vertical impermeable inner wall and extends to one side of a solid waste storage yard/polluted site, a vertical impermeable outer wall (12-2) and an outer wall covering plate (12-4) which is arranged at the upper part of the vertical impermeable outer wall and extends outwards; the horizontal seepage-proofing system is formed by combining a basic 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 simultaneously meets the process requirements of horizontal seepage prevention and vertical seepage prevention, realizes greening and beautifying of solid waste storage yards/polluted sites, has smooth drainage and excellent drainage water quality, saves clay resources, reduces the use amount of earthwork, and has simple construction, low cost and good effect.
Description
Technical Field
The invention belongs to the technical field of seepage-proofing engineering construction for pollution 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 pollution sites, in-situ treatment of solid wastes, leakage collection of wastewater, water quality protection of river channels and the like, and is more applicable to solid waste storage sites requiring the simultaneous horizontal seepage-proofing and vertical seepage-proofing.
Background
For historical reasons, many enterprises generate a large amount of solid wastes in the production process, such as steel slag, copper smelting waste slag, stripped waste rocks (soil) generated by mining, and the like, and a large amount of solid wastes are piled up for a long time to form solid waste piling sites such as dressing and smelting slag sites, soil discharging sites, and the like, rainwater enters the solid waste piling sites to generate harmful wastewater, and then the harmful wastewater enters underground water or leaks out, so that the safety of local water systems is seriously affected, soil quality is damaged, plant growth is affected, and the local environmental quality is damaged.
Currently, the main methods for disposing of these solid wastes are: the impermeable methods adopted by the method comprise horizontal impermeable and vertical impermeable.
For the landfill of different places, only a small amount of solid waste is feasible under the conditions of environmental protection, safety and reliability; for historical reasons, on-site management is also a viable approach for large amounts of already existing solid wastes.
The horizontal seepage prevention is to build an impermeable layer on the surface of the solid waste storage yard in the horizontal direction, prevent rainwater or external fresh water from entering the solid waste storage layer below, and avoid the pollution of solid waste to generate new wastewater to pollute underground water.
The vertical seepage prevention is to build a vertical barrier (seepage prevention wall) around the solid waste storage yard or in a certain depth range of the downstream of underground water flow, so as to prevent the polluted water flow from diffusing and migrating to other water areas to pollute the surrounding water area.
At present, the vertical seepage prevention and the horizontal seepage prevention treatment of the wastewater generated by solid waste are respectively treated, and the construction method adopting the vertical seepage prevention and the horizontal seepage prevention measures respectively has the advantages of long construction period, complex construction and high cost. How to combine the horizontal seepage prevention and the vertical seepage prevention mutually, and construct a horizontal seepage prevention and vertical seepage prevention combined structure system together, has important significance for saving clay resources, reducing the use amount of earthwork, simplifying construction procedures and improving seepage prevention effect.
Disclosure of Invention
The invention aims to solve the problems of poor seepage prevention effect, long construction period, complex construction procedures and high cost in the prior art, and provides a construction method of a horizontal seepage prevention and vertical seepage prevention combined structure which can save clay resources, reduce the use amount of earthwork, is simple and convenient to construct, has low construction cost and has good seepage prevention effect.
In order to achieve the above purpose, the construction method of the horizontal impermeable and vertical impermeable combined structure is implemented by adopting the following technical scheme:
the invention relates to a construction method of a horizontal seepage-proofing and vertical seepage-proofing combined structure, which adopts a combined seepage-proofing structure comprising a vertical seepage-proofing wall, a composite seepage-proofing engineering structure, a horizontal seepage-proofing system and a filtering drainage system; the composite impermeable engineering structure consists of a vertical impermeable inner wall, an inner wall covering plate, a vertical impermeable outer wall and an outer wall covering plate, wherein the upper part of the vertical impermeable inner wall extends to one side of a solid waste storage yard/polluted site; the vertical impervious wall is positioned at the lower part of the position between the vertical impervious inner wall and the vertical impervious outer wall, a vertical impervious bonding 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 bonding layer is a horizontal impervious rainwater collecting and discharging space; the horizontal seepage-proofing system is positioned on the original base layer of the side of the vertical seepage-proofing inner wall, which is close to the solid waste storage yard/polluted site, and consists of a base layer, a seepage-proofing material protection layer, a horizontal seepage-proofing layer, an ecological base layer and an ecological layer from bottom to top; the vertical impermeable inner wall is internally provided with drain holes at intervals, the inlet of the drain hole is sequentially provided with a reverse filtering layer and a filtering layer, the outlet of the drain hole is discharged to a horizontal impermeable rainwater collecting outer draining space, the reverse filtering layer, the drain hole and the horizontal impermeable rainwater collecting outer draining space jointly form a filtering drain system, and the space size of the horizontal impermeable rainwater collecting outer draining space is determined according to regional environment remediation and rainwater collecting and discharging calculation; the construction method comprises the following steps:
1) 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 the original base layer of the solid waste storage yard/polluted site according to the design elevation and gradient requirements;
2) Constructing a composite seepage-proofing engineering structure according to the position of the vertical seepage-proofing line; the composite seepage-proofing engineering structure is formed by adopting a reinforced concrete structure and pouring concrete after supporting a formwork and binding reinforcing steel bars; the drain hole and the vertical impermeable inner wall are constructed synchronously;
3) After the stable acceptance of the composite impervious engineering structure, constructing a vertical impervious wall, wherein the vertical impervious wall adopts plain concrete or triaxial cement mixing piles or high-pressure jet grouting piles; the depth of the vertical impervious wall needs to reach that the permeability coefficient is less than 1x10 -7 Is prevented from penetrating into soil layers with penetration coefficient smaller than 1x10 -7 The thickness of the impermeable soil layer is not less than 1000mm;
4) Construction of a base layer and a seepage-proof material protection layer: the foundation layer adopts mixed filling soil, and is compacted in layers, and the compaction density is not less than 0.95; the protective layer of the seepage-proofing material adopts plain soil, the plain soil is leveled and compacted, and impurities such as organic matters, crushed stone, grass and wood dust and the like cannot be contained in the plain soil;
5) Constructing a reverse filtering layer, wherein the reverse filtering layer adopts a round reverse filtering layer bag, contains graded broken stone and is wrapped with geotextile;
6) Constructing a filter layer, wherein the filter layer adopts coarse sand and is wrapped and distributed around the round reverse filter layer; the coarse sand is particles with the particle size of more than 0.075mm, and the total weight of the particles exceeds 85%;
7) Paving a horizontal impermeable layer, wherein the horizontal impermeable layer adopts a high-density polyethylene HDPE geotechnical impermeable film, and a geotechnical cloth protective layer is added on the horizontal impermeable 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 the plant variety is determined according to the requirements of regional ecological environment protection and greening;
9) And constructing a vertical seepage-proofing bonding layer, wherein the vertical seepage-proofing bonding layer adopts plain concrete.
Further, a horizontal cover plate is arranged on the vertical impermeable inner wall and the vertical impermeable outer wall, the horizontal cover plate adopts a concrete cover plate, and the horizontal cover plate is provided with a grate hole.
By combining the seepage-proofing effect and the construction cost and comparing the test research results, the thickness B1 of the vertical seepage-proofing inner wall and the vertical seepage-proofing outer wall is preferably in the range of 150-200 mm; the thickness B2 of the vertical impervious wall is preferably 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 -7 Ensuring that the depth meets 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 impermeable inner wall and the vertical impermeable 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 compacted by layering is not more than 200mm; the thickness of the anti-seepage material protective layer is 150-250 mm.
Further, the diameter of the circular reverse filtering layer bag is in the range of 360-450 mm, and the upper and lower heights of the circular reverse filtering layer bag also need to be respectively positioned 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 geotechnical impermeable film with the thickness of 1.5 mm.
After the technical scheme is adopted by the construction method of the horizontal seepage-proofing and vertical seepage-proofing combined structure, the construction method has the following positive effects:
(1) The combined seepage-proofing structure composed 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 process requirements of horizontal seepage-proofing and vertical seepage-proofing are simultaneously met, and perfect combination of horizontal seepage-proofing and vertical seepage-proofing is realized;
(2) The horizontal seepage-proofing system is composed of a base layer, a seepage-proofing material protection layer, a horizontal seepage-proofing layer, an ecological base layer and an ecological layer from bottom to top, so that the horizontal seepage-proofing requirement of the solid waste storage yard/polluted site can be met, the ecology of the solid waste storage yard/polluted site is repaired, and the greening and beautifying of the solid waste storage yard/polluted site are realized;
(3) The vertical seepage-proofing system consists of a vertical seepage-proofing wall positioned at the bottom, a vertical seepage-proofing inner wall positioned at the upper part, a vertical seepage-proofing outer wall double-layer structure and a vertical seepage-proofing combination layer, and has good vertical seepage-proofing effect and convenient construction;
(4) The filtering drainage system is formed by the reverse filtering layer, the drainage hole and the horizontal seepage-proof rainwater collecting outer drainage chamber, so that drainage is smooth and water quality is good.
(5) The invention adopts sinking type horizontal seepage prevention, namely: the rainwater permeates into the horizontal impermeable layer through the ecological layer and the ecological base layer, and then flows downwards along the filter layer, the reverse filter layer and the drain hole through the horizontal impermeable layer to the outside of the horizontal impermeable rainwater collection evacuation room to be discharged; the sinking type horizontal seepage prevention and vertical seepage prevention combined structure not only saves clay resources and reduces the use amount of earthwork, but also has simple and convenient construction, low cost and good effect.
Drawings
FIG. 1 is a cross-sectional view of a combined impermeable structure designed by the construction method of a combined horizontal impermeable and vertical impermeable structure according to the present invention.
Reference numerals: 1-an ecological layer; 2-an ecological base layer; 3-a horizontal barrier layer; 4-a protective layer of impermeable material; 5-a base layer; 6-original base layer (i.e. solid waste yard/contaminated site surface layer); 7-a drain hole; 8-a reverse filtration layer; 9-a filter layer; 10-a vertical impervious wall; 11-a vertical barrier bond layer; 12-a composite seepage-proofing engineering structure; 12-1-a vertical impermeable inner wall; 12-2-vertical impermeable outer walls; 12-3-inner wall cladding sheets; 12-4-an outer wall covering plate; 13-collecting the horizontal seepage-proof rainwater in the drainage space; 14 horizontal cover plates.
Detailed Description
In order to further describe the present invention, a construction method of a horizontal impermeable and vertical impermeable composite structure according to the present invention is described in further detail with reference to the accompanying drawings.
As seen from a sectional view of a combined impermeable structure designed by a construction method of the combined horizontal impermeable and vertical impermeable structure shown in FIG. 1, the construction method of the combined horizontal impermeable and vertical impermeable structure comprises 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 impermeable engineering structure 12 is composed of a vertical impermeable inner wall 12-1, an inner wall covering plate 12-3, a vertical impermeable outer wall 12-2 and an outer wall covering plate 12-4, wherein the upper part of the vertical impermeable inner wall extends to one side of a solid waste storage yard/polluted site; the vertical impervious wall 10 is positioned at the lower part of the position between the vertical impervious inner wall 12-1 and the vertical impervious outer wall 12-2, a vertical impervious bonding 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 bonding layer 11 is a horizontal impervious rainwater collecting outer emptying 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 the original base layer 6 of the side of the vertical seepage-proofing inner wall 12-1, which is close to the solid waste storage yard/polluted site, and is formed by combining 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 vertical impermeable inner wall 12-1 is internally provided with drain holes 7 at intervals, the inlet of the drain holes 7 is sequentially provided with a reverse filtering layer 8 and a filtering layer 9, the outlet of the drain holes 7 is discharged to a horizontal impermeable rainwater collecting outer emptying space 13, the reverse filtering layer 8, the filtering layer 9, the drain holes 7 and the horizontal impermeable rainwater collecting outer emptying space 13 jointly form a filtering and draining system, and the space size of the horizontal impermeable rainwater collecting outer emptying space 13 is determined according to regional environment remediation and rainwater collecting and discharging calculation.
The technical parameters of the combined seepage-proofing structure adopted in the embodiment are as follows:
the thickness B1 of the vertical impermeable inner wall 12-1 and the vertical impermeable outer wall 12-2 is 150-200 mm, the thickness B2 of the vertical impermeable wall 11 is 600-800 mm, the thickness H3 of the inner wall cover plate 12-3 and the outer wall cover plate 12-4 is 150-200 mm, and the height H4 of the vertical impermeable inner wall 12-1 and the vertical impermeable outer wall 12-2 is 1300-1800 mm; the thickness of the base layer 5 is 500mm, and the thickness of each layer compacted by layering is not more than 200mm; the thickness of the impermeable material protective layer 4 is 200mm; the diameter of the round reverse filtering layer packet is in the range of 400 mm; the thickness of the filter layer 9 is 500mm; the thickness of the ecological base layer 2 is 500mm; the horizontal impermeable layer 3 is a high-density polyethylene HDPE geotechnical impermeable film with the thickness of 1.5 mm; the upper and lower heights of the round inverted filter bag also need to be 100mm below the inlet of the drain hole and 100mm above the inlet of the drain hole respectively.
The construction method comprises the following steps:
1) The outer edge of the solid waste storage yard/polluted site needing horizontal seepage prevention and vertical seepage prevention is defined, a vertical seepage prevention line is defined, and site leveling of the original base layer 6 of the solid waste storage yard/polluted site is carried out according to the design elevation and gradient requirements;
2) Constructing a composite impermeable engineering structure 12 according to the positions of the vertical impermeable lines; the composite seepage-proofing engineering structure 12 is formed by adopting a reinforced concrete structure, and pouring concrete after formwork supporting and steel bar binding; the drain hole 7 and the vertical impermeable inner wall 12-1 are constructed synchronously; the composite seepage-proofing engineering structure 12 adopts a reinforced concrete structure, wherein the diameter of steel bars in the concrete is 14mm, and the spacing between the steel bars is 200mm; the drain holes 7 are made of pre-buried phi 100 plastic steel pipes, the spacing is 2000mm, and the vertical positions are determined according to the design;
3) After the composite impervious engineering structure 12 is stably checked and accepted, constructing a vertical impervious wall 10, wherein the vertical impervious wall 10 adopts C15 plain concrete or triaxial cement stirring piles or high-pressure jet grouting piles;
4) Construction of a base layer 5 and a seepage-proofing material protection layer 4: the foundation layer 5 adopts mixed filling soil, and is compacted in layers; the impermeable material protective layer 4 adopts plain soil, and is leveled and compacted;
5) Constructing a reverse filtering layer 8, wherein the reverse filtering layer 8 adopts a round reverse filtering layer bag, contains graded broken stone and is wrapped with geotextile;
6) Constructing a filter layer 9, wherein the filter layer 9 adopts coarse sand and is wrapped around a round reverse filter layer;
7) Paving 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 on the horizontal impermeable 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 requirements of regional ecological environment protection and greening;
9) Constructing a vertical seepage-proofing bonding layer 11, wherein the vertical seepage-proofing bonding layer 11 adopts plain concrete;
10 The fabrication and installation of the horizontal cover plate 14 is completed.
Test verification shows that compared with the horizontal seepage prevention method and the vertical seepage prevention method, the invention can save more than 30% of civil engineering cost, and can effectively save land use area at the same time, thereby saving land resources.
The invention is suitable for solid waste piles with different shapes, such as the ground, pits and hills, and is particularly suitable for the situation requiring the ground 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 of: 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 impermeable engineering structure (12) is composed of a vertical impermeable inner wall (12-1), an inner wall covering plate (12-3) which is arranged at the upper part of the vertical impermeable inner wall and extends to one side of a solid waste storage yard/polluted site, a vertical impermeable outer wall (12-2) and an outer wall covering plate (12-4) which is arranged at the upper part of the vertical impermeable outer wall and extends outwards; the vertical impervious wall (10) is positioned at the lower part of the position between the vertical impervious inner wall (12-1) and the vertical impervious outer wall (12-2), a vertical impervious bonding 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 bonding layer (11) is a horizontal impervious rainwater collecting outer emptying space (13); the horizontal seepage-proofing system is positioned on an original base layer (6) of a vertical seepage-proofing inner wall (12-1) close to one side of a solid waste storage yard/polluted site, and is formed by combining 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; a drain hole (7) is arranged in the vertical impermeable inner wall (12-1) at intervals, a reverse filtering layer (8) and a filter layer (9) are sequentially arranged at the inlet of the drain hole (7), the outlet of the drain hole (7) is discharged to a horizontal impermeable rainwater collecting outer emptying room (13), the reverse filtering layer (8), the filter layer (9), the drain hole (7) and the horizontal impermeable rainwater collecting outer emptying room (13) jointly form a filtering drain system, and the space size of the horizontal impermeable rainwater collecting outer emptying room (13) is determined according to regional environment remediation and rainwater collecting and discharging calculation; the construction method comprises the following steps:
1) 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 impermeable engineering structure (12) according to the position of the vertical impermeable line; the composite seepage-proofing engineering structure (12) is formed by adopting a reinforced concrete structure and pouring concrete after supporting a formwork and binding reinforcing steel bars; the drain hole (7) and the vertical impermeable inner wall (12-1) are constructed synchronously;
3) After the composite impervious engineering structure (12) is stably checked and accepted, constructing a vertical impervious wall (10), wherein the vertical impervious wall (10) adopts plain concrete or triaxial cement stirring piles or high-pressure jet grouting piles;
4) Construction of a base layer (5) and an impermeable material protective layer (4): the foundation layer (5) adopts miscellaneous fill, and is compacted in layers; the impermeable material protective layer (4) adopts plain soil, and is leveled and compacted;
5) Constructing a reverse filtering layer (8), wherein the reverse filtering layer (8) adopts a round reverse filtering layer bag, contains graded broken stone and is wrapped with geotextile;
6) Constructing a filter layer (9), wherein the filter layer (9) adopts coarse sand and is wrapped and distributed around the round reverse filter layer;
7) Paving a horizontal impermeable layer (3), wherein the horizontal impermeable layer (3) is a high-density polyethylene HDPE geotechnical impermeable film, and a geotechnical cloth protective layer is added on the horizontal impermeable 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 requirements of regional ecological environment protection and greening;
9) And constructing a vertical seepage-proofing bonding layer (11), wherein the vertical seepage-proofing bonding layer (11) adopts plain concrete.
2. The method for constructing a combined horizontal and vertical impermeable structure according to claim 1, wherein: the adopted combined anti-seepage structure also comprises a horizontal cover plate (14), wherein 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 method for constructing a combined horizontal and vertical impermeable structure according to claim 2, wherein: the thickness B1 of the vertical impermeable inner wall (12-1) and the vertical impermeable outer wall (12-2) is 150-200 mm, the thickness B2 of the vertical impermeable wall (10) 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 impermeable inner wall (12-1) and the vertical impermeable outer wall (12-2) is 1300-1800 mm.
4. A method of constructing a combined horizontal and vertical barrier structure as claimed in claim 3, wherein: the thickness of the base layer (5) is 400-600 mm, and the thickness of each layer compacted by layering is not more than 200mm; the thickness of the impermeable material protective layer (4) is 150-250 mm.
5. The method for constructing a combined horizontal and vertical impermeable structure as claimed in claim 1, 2, 3 or 4, wherein: the diameter of the round reverse filtering layer packet is in the range of 360-450 mm.
6. The method for constructing a combined horizontal and vertical seepage-proofing structure according to claim 5, wherein: the thickness of the filter layer (9) is 420-560 mm.
7. The method for constructing a combined horizontal and vertical impermeable structure according to claim 6, wherein: the thickness of the ecological base layer (2) is 420-560 mm.
8. The method for constructing a combined horizontal and vertical impermeable structure according to 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 method for constructing a combined horizontal and vertical impermeable structure according to claim 8, wherein: the upper and lower heights of the round inverted filter bag also need to be respectively positioned below the inlets of the drain holes and not less than 80mm, and the upper heights of the round inverted filter bag are also not less than 80mm.
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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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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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