CN107620325B - Composite seepage-proofing system for high and steep side slope of landfill - Google Patents
Composite seepage-proofing system for high and steep side slope of landfill Download PDFInfo
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- CN107620325B CN107620325B CN201710977628.0A CN201710977628A CN107620325B CN 107620325 B CN107620325 B CN 107620325B CN 201710977628 A CN201710977628 A CN 201710977628A CN 107620325 B CN107620325 B CN 107620325B
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
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Abstract
The invention relates to a composite seepage prevention system for a high steep slope of a landfill site, which comprises the following components: the device comprises a silk screen structure, a guide and drainage layer, a plurality of guide and drainage pipes, an impermeable layer and a geomembrane; the silk screen structure is fixed on a high steep side slope of the landfill; the guide layer is arranged on the silk screen structure; one end of the guide and discharge pipe extends into the high steep slope of the landfill site, and the other end extends into the guide and discharge layer; the impermeable layer is arranged on the guide layer; the geomembrane is fixed on the impermeable layer through expansion screws. The composite seepage prevention system increases the seepage prevention performance of the seepage prevention system of the valley type landfill site, and improves the stability and safety of the seepage prevention system.
Description
Technical Field
The invention relates to the technical field of environmental geotechnical engineering, in particular to a composite seepage-proofing system for a high and steep slope of a landfill site.
Background
The problem of failure control of composite liner seepage control systems of landfill disposal sites for solid wastes (household garbage, hazardous wastes, sludge silt, polluted soil and the like) has become one of the great engineering problems to be solved in the field of solid waste disposal site engineering. In recent years, the composite liner seepage-proofing system gradually replaces the traditional compacted clay seepage-proofing structure due to the characteristics of strong damage resistance, outstanding seepage-proofing effect and the like.
The valley type landfill is a landfill site selected by priority in hilly and hilly areas of China, and has the advantages of large storage capacity, small land occupation area and the like. The common sheet of the slope surface of the valley type landfill has a large number of joint cracks, and an anti-seepage structure is arranged on the slope surface, so that the leachate in the landfill is prevented from flowing out of the landfill through the joint cracks of the slope and polluting the surrounding water and soil environment. However, since the side slope of the valley type landfill is steep and the slope is long, the composite liner seepage prevention system formed by the seepage prevention materials such as HDPE (high density polyethylene) geomembrane, the geotechnical polymerization clay cushion and the compacted clay layer is difficult to ensure the self stability of the composite liner seepage prevention system on the side slope and difficult to construct due to the weak interface strength.
In the prior art, the common silicate water is mainly sprayed to serve as an impermeable layer for the side slope impermeable structure of the valley type landfill, but the permeability coefficient of the coagulated silicate cement impermeable layer is larger, so that the impermeable requirement of the landfill cannot be met.
Disclosure of Invention
The invention provides a composite seepage-proofing system for a high steep slope of a landfill, which solves or partially solves the technical problems that the seepage-proofing layer in the prior art has larger seepage-proofing coefficient and cannot meet the seepage-proofing requirement of the landfill, improves the safety of the seepage-proofing system of the valley-type landfill, and avoids the environmental geological disaster caused by the integral sliding of the seepage-proofing system.
The invention provides a composite seepage prevention system for a high steep slope of a landfill, which comprises the following components:
the silk screen structure is fixed on the high steep side slope of the landfill;
the guide layer is arranged on the silk screen structure;
one end of each guide and discharge pipe extends into the high steep slope of the landfill, and the other end extends into the guide and discharge layer;
the impermeable layer is arranged on the guide-row layer;
and the geomembrane is fixed on the impermeable layer through expansion screws.
Preferably, the wire mesh structure is a steel wire mesh.
Preferably, the material of the guide layer is concrete;
the concrete is prepared by mixing cement and coarse sand;
the concrete is fixed on the silk screen structure through spraying to form the guide layer.
Preferably, the plurality of guide pipes are distributed at intervals at different heights of the landfill site high and steep slope;
the guide and discharge pipes are obliquely arranged and are positioned at one end of the high and steep slope of the landfill site, and the end of the guide and discharge pipes is higher than one end of the guide and discharge layer.
Preferably, the inclination angle of the guide tube with respect to the horizontal plane is 0 to 10 °.
Preferably, the impermeable layer is prepared by mixing cement and bentonite;
the impermeable layer is fixed on the guide layer through spraying.
Preferably, the geomembrane is made of high-density polyethylene.
Preferably, the expansion screw is perpendicular to the direction of the landfill site high steep side slope.
Preferably, the method further comprises:
the anti-seepage cap is of a hemispherical structure, and the edge of the anti-seepage cap extends outwards to form a circular cap peak; the anti-seepage cap is arranged outside the expansion screw;
the annular hat brim is fixed on the geomembrane.
Preferably, the impermeable cap and the circular cap peak are made of rubber;
the annular hat brim is fixed with the geomembrane through welding.
One or more technical solutions provided in the present application have at least the following technical effects or advantages:
because the silk screen structure is adopted to be fixed on the high steep side slope of the landfill; the guide layer is arranged on the silk screen structure; one end of the guide and discharge pipe extends into the high steep slope of the landfill site, and the other end extends into the guide and discharge layer; the impermeable layer is arranged on the guide layer; the geomembrane is fixed on the impermeable layer through expansion screws. Diving in the slope of the landfill site can enter the guide and drainage layer through the guide and drainage pipes, then flows to the guide and drainage ditch of the slope toe along the guide and drainage pipe under the action of gravity, and flows out of the landfill site through the guide and drainage ditch, so that the problem that the water level in the slope is high due to the fact that diving in the slope cannot be guided and drainage is threatening to the stability and safety characteristics of the slope and the composite liner seepage prevention system is avoided. When the geomembrane is damaged, the impermeable layer can play a certain role in impermeable. The silk screen structure, the guide layer and the impermeable layer form a whole, the interface strength is high, the self stability is guaranteed, and meanwhile, the geomembrane is fixed on the impermeable layer through expansion screws, so that the anti-slip stability of the geomembrane is greatly improved. Therefore, the technical problems that the permeability coefficient of the impermeable layer is large and the impermeable requirement of the landfill site cannot be met in the prior art are effectively solved, the safety of the impermeable system of the valley type landfill site is improved, and the technical effect of avoiding pollution of surrounding water and soil is achieved.
Drawings
FIG. 1 is a schematic structural diagram of a composite impermeable system for a high steep slope of a landfill according to an embodiment of the present invention;
FIG. 2 is a front elevational view of the impermeable cap of FIG. 1;
fig. 3 is a top view of the construction of the impermeable cap of fig. 1.
( The components represented by the reference numerals in the drawings are in turn: 1 side slope, 2 silk screen structure, 3 guide and discharge pipes, 4 expansion screws, 5 guide and discharge layers, 6 impermeable layers, 7 geomembranes, 8 impermeable caps and 9 annular hat brim )
Detailed Description
The embodiment of the application provides a composite seepage-proofing system for a high steep slope of a landfill, which solves or partially solves the technical problems that the seepage-proofing layer in the prior art has larger seepage-proofing coefficient and cannot meet the seepage-proofing requirement of the landfill, and the silk screen structure is fixed on the high steep slope of the landfill; the guide layer is arranged on the silk screen structure; one end of the guide and discharge pipe extends into the high steep slope of the landfill site, and the other end extends into the guide and discharge layer; the impermeable layer is arranged on the guide layer; the geomembrane is fixed on the impermeable layer through expansion screws; the technical effect of improving the safety of the seepage-proofing system of the valley type landfill and avoiding the pollution of surrounding water and soil is realized.
Referring to fig. 1, the present invention provides a composite seepage prevention system for a landfill high steep slope, comprising: the device comprises a silk screen structure 2, a guide and drainage layer 5, a plurality of guide and drainage pipes 3, an impermeable layer 6 and a geomembrane 7; the silk screen structure 2 is fixed on the landfill site high and steep slope 1; the guide layer 5 is arranged on the silk screen structure 2; one end of the guide and discharge pipe 3 extends into the high and steep side slope 1 of the landfill site, and the other end extends into the guide and discharge layer 5; the impermeable layer 6 is arranged on the guide layer 5; the geomembrane 7 is fixed on the impermeable layer 6 through expansion screws 4, and the geomembrane 7 is made of high-density polyethylene (HDPE).
The diving in the slope 1 of the landfill site can enter the guide and drainage layer 5 through the guide and drainage pipe 3, then flows to the guide and drainage ditch of the slope toe along the guide and drainage layer 5 under the action of gravity, and flows out of the landfill site through the guide and drainage ditch, so that the problem that the water level in the slope 1 is high due to the fact that the diving in the slope cannot be guided and drainage is threatening to the stable safety characteristics of the slope 1 and the composite liner seepage prevention system is avoided. When the geomembrane 7 is damaged, the impermeable layer 6 can play a certain role in impermeable. The silk screen structure 2, the guide and drainage layer 5 and the impermeable layer 6 form a whole, the interface strength is high, the stability of the self is guaranteed, meanwhile, the geomembrane 7 is fixed on the impermeable layer 6 through the expansion screw 4, and the anti-slip stability of the geomembrane 7 is greatly improved.
Further, the wire mesh structure 2 is a steel wire mesh. The material of the guide layer 5 is concrete; the concrete is prepared by mixing cement and coarse sand; the concrete is fixed to the screen structure 2 by spraying to form a drainage layer 5. The concrete guide and drainage layer 5 formed by solidifying cement and coarse sand has high permeability, and diving in the landfill slope 1 can enter the concrete guide and drainage layer 5 through the guide and drainage pipe 3.
Furthermore, a plurality of guide pipes 3 are distributed at intervals at different heights of the high and steep slope 1 of the landfill site; the guide and discharge pipes 3 are obliquely arranged and positioned at one end of the landfill high and steep slope 1, which is higher than one end of the guide and discharge layer 5, and the inclination angle of the guide and discharge pipes 3 relative to the horizontal plane is 0-10 degrees, so that the guide and discharge layer 5 is conveniently guided by the diving flow of the landfill high and steep slope 1; as a preferred embodiment, the guide tube 3 is inclined at an angle of 5 ° to the horizontal.
Further, the impermeable layer 6 is prepared by mixing cement and bentonite; the barrier layer 6 is fixed to the drainage layer 5 by spraying. The impermeable layer 6 formed by solidifying cement and bentonite has low permeability, can be used as a secondary impermeable layer of a composite liner impermeable system, and can play a certain role in impermeable when the primary impermeable geomembrane 7 is damaged.
Further, the expansion screw 4 is perpendicular to the direction of the landfill high steep slope 1.
Further, referring to fig. 2 and 3, the method further includes: the anti-seepage cap 8 is of a hemispherical structure, and the edge of the anti-seepage cap extends outwards to form a circular hat peak 9; the anti-seepage cap 8 is arranged outside the expansion screw 4 in a covering way, so that the problem of leakage of the expansion screw 4 to the perforation of the geomembrane 7 is solved; the annular cap peak 9 is fixed on the geomembrane 7. The impermeable cap 8 and the annular cap peak 9 are made of rubber; the annular hat brim 9 and the geomembrane 7 are fixed by heating and bonding. Geomembrane 7 passes through expansion screw 4 to be fixed on barrier layer 6, has promoted HDPE geomembrane 7's anti-skidding stability by a wide margin, and each expansion screw 4 wears an prevention of seepage cap 8, and prevention of seepage cap 8 adopts the design of roof-falling cap brim, and roof-falling adopts thick rubber, has avoided expansion screw 4's end to puncture prevention of seepage cap, and the brim of a hat adopts the rubber membrane, has increased prevention of seepage cap 8 and HDPE geomembrane 7 connection's reliability.
One or more technical solutions provided in the present application have at least the following technical effects or advantages:
because the silk screen structure 2 is adopted to be fixed on the high and steep slope 1 of the landfill; the guide layer 5 is arranged on the silk screen structure 2; one end of the guide and discharge pipe 3 extends into the high and steep side slope 1 of the landfill site, and the other end extends into the guide and discharge layer 5; the impermeable layer 6 is arranged on the guide layer 5; the geomembrane 7 is secured to the barrier layer 6 by expansion screws 4. The concrete drainage layer 5 formed by solidifying cement and coarse sand has high permeability, diving in the slope 1 of the landfill site can enter the concrete drainage layer 5 through the drainage pipe 3, then flows to the drainage ditch of the slope foot along the concrete drainage layer 5 under the action of gravity, flows out of the landfill site through the drainage ditch, and therefore the stable safety characteristics of the slope 1 and the composite liner seepage prevention system are prevented from being threatened due to the fact that water level in the slope 1 is high due to the fact that diving in the slope cannot be conducted. The impermeable layer 6 formed by solidifying cement and bentonite has low permeability, can be used as a secondary impermeable layer of a composite liner impermeable system, and can play a role in impermeable when the primary impermeable HDPE geomembrane 7 is damaged. The steel wire mesh, the concrete guide and discharge layer 5 and the impermeable layer 6 form a whole after concrete is solidified, the interface strength is high, the self stability is guaranteed, and meanwhile, the HDPE geomembrane 7 is fixed on the impermeable layer 6 through the expansion screw 4, so that the anti-slip stability of the HDPE geomembrane 7 is greatly improved. Each expansion screw 4 wears an anti-seepage cap 8, so that the problem of seepage of the expansion screw 4 to the perforation of the geomembrane 7 is solved, the anti-seepage cap 8 adopts a design of roof-falling and capping brims, the roof-falling adopts thick rubber, the situation that the end head of the expansion screw 4 pierces the anti-seepage cap 8 is avoided, the cap brims adopt rubber membranes, and the welding reliability of the anti-seepage cap 8 and the HDPE geomembrane 7 is improved. Thus, the technical problem that the permeability coefficient of the impermeable layer 6 is larger and the impermeable requirement of the landfill site cannot be met in the prior art is effectively solved, the safety of the impermeable system of the valley landfill site is improved, and the problem of environmental geological disasters caused by the whole sliding of the impermeable system is avoided.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (1)
1. A composite barrier system for a high steep slope of a landfill site, comprising:
the wire mesh structure is fixed on the high and steep slope of the landfill, and is a steel wire mesh;
the guide layer is arranged on the silk screen structure, the guide layer is made of concrete, the concrete is prepared by mixing cement and coarse sand, and the concrete is fixed on the silk screen structure through spraying to form the guide layer;
one end of each guide and discharge pipe extends into the high steep slope of the landfill, and the other end extends into the guide and discharge layer; the plurality of guide and discharge pipes are distributed at intervals at different heights of the high and steep slope of the landfill site; the guide and discharge pipes are obliquely arranged and positioned at one end of the high and steep slope of the landfill site, which is higher than one end of the guide and discharge layer, and the inclination angle of the guide and discharge pipes relative to the horizontal plane is 0-10 degrees;
the impermeable layer is arranged on the guide and drainage layer, the impermeable layer is prepared by mixing cement and bentonite, and the impermeable layer is fixed on the guide and drainage layer by spraying;
the geomembrane is fixed on the impermeable layer through expansion screws, and is made of high-density polyethylene;
the anti-seepage cap is of a hemispherical structure, and the edge of the anti-seepage cap extends outwards to form a circular cap peak; the anti-seepage cap is arranged outside the expansion screw, and the expansion screw is perpendicular to the direction of the landfill site high steep slope; the annular hat brim is fixed on the geomembrane; the impermeable cap and the circular cap peak are made of rubber; the annular hat brim is fixed with the geomembrane through welding;
wherein the silk screen structure, the guide layer and the impermeable layer form a whole after the concrete is solidified; diving in the high steep slope of the landfill enters the guide-drainage layer through the guide-drainage pipe, flows to the guide-drainage ditch of the slope toe along the guide-drainage layer under the action of gravity, and flows out of the landfill through the guide-drainage ditch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710977628.0A CN107620325B (en) | 2017-10-17 | 2017-10-17 | Composite seepage-proofing system for high and steep side slope of landfill |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710977628.0A CN107620325B (en) | 2017-10-17 | 2017-10-17 | Composite seepage-proofing system for high and steep side slope of landfill |
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| CN107620325A CN107620325A (en) | 2018-01-23 |
| CN107620325B true CN107620325B (en) | 2023-05-09 |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201459746U (en) * | 2009-07-16 | 2010-05-12 | 中国水电顾问集团华东勘测设计研究院 | Underground water guiding and draining structure of anchoring groove position of landfill site |
| CN201588199U (en) * | 2009-10-22 | 2010-09-22 | 北京高能时代环境技术股份有限公司 | Anti-seepage structure for waste landfill handling project |
| CN101914918B (en) * | 2010-07-12 | 2012-06-06 | 无锡市政设计研究院有限公司 | High-steep side slope and intensely weathered bed rock solid waste landfill site seepage prevention structure and treatment method thereof |
| CN101956404B (en) * | 2010-09-07 | 2012-01-18 | 中国市政工程西北设计研究院有限公司 | Side slope middle impermeable layer anchoring of steep hard rocky bedrock side slope single-layer impermeable structure |
| CN102002961A (en) * | 2010-10-19 | 2011-04-06 | 浙江大学 | Impermeable gasket for bottom side slope of refuse landfill |
| CN202099865U (en) * | 2010-12-24 | 2012-01-04 | 天津合佳威立雅环境服务有限公司 | Leachate drainage system for hazardous waste safety landfill |
| CN202227453U (en) * | 2011-08-24 | 2012-05-23 | 中国水电顾问集团华东勘测设计研究院 | Floor drain type seepage-proofing drainage-guiding structure of refuse landfill |
| CN205999943U (en) * | 2016-09-08 | 2017-03-08 | 湖南艾布鲁环保科技有限公司 | A kind of landfill yard constructs system |
| CN207597444U (en) * | 2017-10-17 | 2018-07-10 | 中国科学院武汉岩土力学研究所 | A kind of composite anti-penetrating system for landfill yard high gradient slope |
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