CN109137997B - Anti-seepage liner system for bottom slope of refuse landfill and construction method - Google Patents

Anti-seepage liner system for bottom slope of refuse landfill and construction method Download PDF

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CN109137997B
CN109137997B CN201810956308.1A CN201810956308A CN109137997B CN 109137997 B CN109137997 B CN 109137997B CN 201810956308 A CN201810956308 A CN 201810956308A CN 109137997 B CN109137997 B CN 109137997B
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geotextile
geomembrane
photocuring
seepage
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CN109137997A (en
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李丽华
耿樟帅
黄杰
肖衡林
马强
叶建军
陶高梁
陈智
胡智
李俊鹏
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Hubei University of Technology
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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
    • 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
    • E02D31/06—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 against corrosion by soil or water

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
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  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
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Abstract

The invention provides an anti-seepage liner system for a bottom slope of a refuse landfill and a corresponding construction method. The present invention provides a barrier liner system comprising: compacting the soil protection layer, and forming a plurality of layers of compacted soil by layering and compacting; the geogrid reinforcement layer is laid on the compacted soil protection layer; a GCL (bentonite waterproof pad) secondary impermeable layer which is laid on the geogrid reinforcement layer; the main anti-seepage layer of the photocuring geomembrane is a continuous photocuring geomembrane which is sprayed on the GCL secondary anti-seepage layer and is formed after photocuring; the geotextile secondary protective layer is laid on the light-cured geomembrane main impermeable layer; and the main protective layer of the geotextile bag is laid on the secondary protective layer of the geotextile and comprises a plurality of geotextile bags filled with sandy soil. The seepage-proofing gasket system has good seepage-proofing effect and the capability of preventing the gasket system from being damaged, and can better realize the seepage-proofing performance on the side slope of the refuse landfill.

Description

Anti-seepage liner system for bottom slope of refuse landfill and construction method
Technical Field
The invention belongs to the field of buildings, and particularly relates to an anti-seepage liner system for a bottom slope of a refuse landfill and a construction method.
Background
In recent years, nearly 10 hundred million tons of garbage are generated in China every year, and the generation amount of urban domestic garbage is increased at a high speed of 5% -8% every year. Under the current economic and technical conditions, landfill is the most important and effective method for treating urban garbage. However, long-term stacking and storage of garbage and waste materials can generate leachate and derived gas, so that the surrounding environment is polluted, and according to relevant specifications of China, an anti-seepage liner system needs to be arranged at the bottom of a landfill. However, with the increase of the landfill height of the garbage body, the geomembrane on the slope generates tensile stress under the action of the gravity of the overlying pile body, so that the liner system is easy to be damaged by tension, the seepage-proofing performance of the liner system is ineffective, and the seepage of garbage percolate is caused.
China's relevant regulations suggest that the landfill site seepage-proofing gasket can adopt the following four structures: the composite liner system comprises a natural compacted clay liner, a composite liner system consisting of a high-density polyethylene geomembrane and a compacted clay layer, a composite liner system consisting of a geomembrane and a geotechnical composite bentonite liner, and a geomembrane single-layer seepage-proofing structure. The natural compacted clay liner is difficult to construct on the steep side slope at the bottom of the landfill, and adverse effects caused by garbage settlement are not considered in other structural forms.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a gasket system for preventing a landfill site from being damaged, which has a good anti-seepage effect and a good ability to prevent the gasket system from being damaged, and can better achieve the anti-seepage performance on a landfill site side slope, and a construction method thereof.
In order to achieve the purpose, the invention adopts the following scheme:
< barrier liner System >
The invention provides an anti-seepage liner system for a bottom side slope of a refuse landfill, which is characterized by comprising a compacted soil protection layer, a geogrid reinforcement layer and a GCL (bentonite waterproof pad) secondary anti-seepage layer, wherein multiple layers of compacted soil are formed by layering and compacting, the geogrid reinforcement layer is laid on the compacted soil protection layer, the GCL secondary anti-seepage layer is laid on the geogrid reinforcement layer, and the permeability coefficient is not more than 5 × 10-9cm/s, wherein the main anti-seepage layer of the light-cured geomembrane is a continuous light-cured geomembrane which is sprayed on the GCL secondary anti-seepage layer and formed after light curing, and the permeability coefficient is not more than 9 × 10-13cm/s; geotextile secondary protective layerLaying on the main anti-seepage layer of the photocuring geomembrane; and the main protective layer of the geotextile bag is laid on the secondary protective layer of the geotextile and comprises a plurality of geotextile bags filled with sandy soil.
Preferably, the impervious liner system for the side slope at the bottom of the refuse landfill according to the invention can also be characterized in that the permeability coefficient of the compacted soil protective layer is not more than 1 × 10-5And cm/s, the compacted soil protection layer comprises 3-4 layers of compacted soil, and the thickness of each layer of compacted soil is 15 cm.
Preferably, the impermeable lining system used on the bottom slope of the refuse landfill can also have the following characteristics: the geogrid reinforcement layer adopts a unidirectional high-density polyethylene geogrid, and the tensile strength is not lower than 100 kN/m.
Preferably, the impermeable lining system used on the bottom slope of the refuse landfill can also have the following characteristics: the GCL secondary impermeable layer has the mass per unit area not less than 4500g/m2The bentonite waterproof pad.
Preferably, the impermeable lining system used on the bottom slope of the refuse landfill can also have the following characteristics: the thickness of the main anti-seepage layer of the photocuring geomembrane is 1 mm-1.5 mm.
Preferably, the impermeable lining system used on the bottom slope of the refuse landfill can also have the following characteristics: the geotextile secondary protective layer should have a puncture strength of not less than 580N and a grip tensile strength of not less than 900N.
Preferably, the impermeable lining system used on the bottom slope of the refuse landfill can also have the following characteristics: 70% -80% of sandy soil is filled in the geotextile bag adopted in the geotextile bag main protective layer, and the thickness of the geotextile bag main protective layer is 8-15 cm.
< construction method >
The invention also provides a construction method for obtaining the above-mentioned material<Impervious liner system>The barrier liner system described in part comprising: step 1, paving clay on the surface of the leveled and compacted side slopeThe method comprises the steps of (1) layering and compacting to form a compacted soil protective layer, (2) laying a geogrid on the compacted soil protective layer, filling filler in time after laying to form a geogrid reinforced layer, and (3) laying a GCL (geosynthetic clay liner) secondary impermeable layer on the geogrid reinforced layer, wherein the permeability coefficient is not more than 5 × 10-9cm/s, and step 4, spraying the photocuring liquid on the GCL secondary impermeable layer, and irradiating the photocuring liquid with ultraviolet light with certain wavelength to form a continuous photocuring geomembrane serving as a main impermeable layer of the photocuring geomembrane, wherein the permeability coefficient is not more than 9 × 10-13cm/s; step 5, laying geotextile on the main impermeable layer of the photocuring geomembrane to form a geotextile secondary protective layer; and 6, directly placing the geotextile bags on the geotextile secondary protective layer, wherein gaps are not reserved among the geotextile bags, and the geotextile bags are required to be placed in order.
Preferably, the invention relates to a barrier liner system for use on the bottom slope of a landfill, which is characterized by the following features: the photocuring solution adopted in the step 4 is a mixed solution of unsaturated monomers or oligomers doped with a photoinitiator and carbon black powder.
Preferably, the construction method according to the present invention may further include: and 3, constructing in sunny days in steps 4 and 6.
Action and Effect of the invention
1) Compacting the soil protection layer evens out the stresses and deformations of the gasket system.
2) The double anti-seepage layer consisting of the GCL secondary anti-seepage layer and the main anti-seepage layer of the photocuring geomembrane can effectively improve the anti-seepage capability of the anti-seepage liner system.
3) The geogrid reinforced layer is arranged under the double anti-seepage layer consisting of the GCL secondary anti-seepage layer and the light-cured geomembrane main anti-seepage layer, so that the light-cured geomembrane main anti-seepage layer mainly bears pressure, and the geogrid reinforced layer mainly bears tension, thereby effectively reducing the condition that the liner fails due to tensile fracture of the light-cured geomembrane main anti-seepage layer.
4) The main anti-seepage layer of the photocuring geomembrane can form a large-area continuous geomembrane by using a spraying method, avoids the risks of complication and damage of seams, can be laid in places where constructors are difficult to involve and climb, and is convenient to construct.
5) The light-cured geomembrane has strong compression resistance and penetration resistance, and is not easy to creep due to the long-term stability of the material; furthermore, the production of photocurable geomembranes is energy intensive and therefore a more desirable option in sustainable development.
6) In the main protective layer of the geotextile bag, the interface friction coefficient of the geotextile bag is smaller, so that the shearing force transferred to the underlying liner system in the garbage settling process can be reduced; and compare in traditional braided bag, the geotechnique's bag still has shock insulation shock attenuation, eliminates the function of frost heaving.
7) The double protective layers consisting of the main protective layer of the geotextile bag and the secondary protective layer of the geotextile can effectively reduce the risk of penetration and damage of the main impermeable layer of the photocuring geomembrane.
In conclusion, the anti-seepage gasket system provided by the invention has good anti-seepage effect and anti-garbage settlement capability, and can better realize the anti-seepage performance on the side slope of the garbage landfill.
Drawings
FIG. 1 is a schematic illustration of the construction of a barrier liner system according to an embodiment of the present invention;
fig. 2 is a schematic construction process diagram of the main impermeable layer of the light-cured geomembrane involved in the embodiment of the present invention.
In fig. 1 and 2, the structures denoted by the reference numerals are:
100-barrier liner system: 10-a compacted soil protection layer, 20-a geogrid reinforcement layer, 30-a GCL secondary impermeable layer, 40-a photocuring geomembrane main impermeable layer, 50-a geotextile secondary protection layer and 60-a geotextile bag main protection layer.
Detailed Description
The impervious liner system and construction method for the bottom side slope of the refuse landfill according to the invention are explained in detail with reference to the attached drawings.
< example >
As shown in fig. 1 and 2, the present embodiment is constructed to obtain a barrier liner system 100 for use on the bottom slope of a landfill site by the following method:
step 1, before laying, firstly processing the ground surface, excavating tree roots within the ground surface range, removing other sundries such as turf, rotten tree roots and the like on the surface layer of the original ground, filling and tamping pits, leveling and compacting according to requirements, then laying a compacted soil protection layer 10 which is compacted, paving by clay, removing harmful stones, soil lumps and other broken slag, compacting in a layering manner during construction, wherein the compaction degree is not lower than 85%, the thickness of each layer is 15cm, the layers are tightly attached to each other, the total thickness of the formed compacted soil protection layer 10 is 60cm, and the permeability coefficient is not more than 1 × 10-5cm/s。
And 2, paving a geogrid reinforcement layer 20 on the compacted soil protection layer 10, wherein a unidirectional high-density polyethylene (HDPE) geogrid is adopted, and the tensile strength is not lower than 100 kN/m. When the geogrid is constructed, the surface of the geogrid is smooth by manual tensioning, and a heavy vehicle is prevented from running on the directly paved geogrid; and filling the filler in time after paving, wherein the filler can be clay, the compactness is not less than 85 percent, and the filler is prevented from being directly exposed for too long time.
Step 3, paving a bentonite waterproof pad on the geogrid reinforcement layer 20 to serve as a GCL (geosynthetic clay liner) secondary impermeable layer 30, wherein the thickness of the GCL secondary impermeable layer 30 is about 3mm, and the permeability coefficient is not more than 5 × 10﹣9cm/s, and the mass per unit area is not less than 4500g/m2. During construction, whether defects such as damage and cavities exist in the appearance or not should be checked, repair measures should be taken, the construction should be carried out on a clear day, and the next construction should be carried out as soon as possible after the construction is completed, so that the bentonite in the GCL-time impermeable layer 30 is prevented from absorbing water and hydrating to influence the internal shear strength and the interface performance of the GCL-time impermeable layer and the photocuring geomembrane.
Step 4, the main anti-seepage layer 40 of the photocuring geomembrane adopts a photocuring geomembrane, unsaturated monomer mixed liquor doped with photoinitiator and carbon black powder is sprayed on the GCL secondary anti-seepage layer during construction, the mixed liquor is irradiated by ultraviolet light with a certain wavelength to form a continuous photocuring geomembrane, the thickness is preferably 1-1.5 mm, and the permeability coefficient is not more than 9 × 10-13cm/s. To protect it from damage, vehicles are prohibited from traveling directly over the light-cured geomembrane primary barrier 40.
And 5, paving the geotextile on the main impermeable layer 40 of the photocuring geomembrane to form a geotextile secondary protective layer 50 with the thickness of 2-2.5 mm. The geotextile adopts non-woven geotextile, and needs to meet the requirements of puncture strength not less than 580N and holding tensile strength not less than 900N. And after the laying is finished, the geotextile secondary protective layer 50 is laid in time for the next construction, so that direct insolation for too long time is avoided.
And 6, directly placing the geotextile bags on the geotextile secondary protective layer 50, wherein gaps are not reserved among the geotextile bags, and the geotextile bags are placed orderly to form a geotextile bag main protective layer 60. Construction should be carried out on a sunny day. The geotextile bag adopted in the embodiment is made of polypropylene (PP) material doped with a proper amount of ultraviolet aging resistant stabilizer, the surface of the geotextile bag is smooth, 70-80% of sandy soil is filled in the geotextile bag, and the size (height, length and width) of the geotextile bag is H multiplied by B which is 10cm multiplied by 40 cm.
The impervious liner system 100 for the bottom side slope of the refuse landfill as shown in fig. 1 can be obtained by the construction method.
The above embodiments are merely illustrative of the technical solutions of the present invention. The present invention relates to a system and method for constructing a barrier liner for a bottom slope of a landfill site, which is not limited to the structure described in the above embodiments, but is subject to the scope defined by the following claims. Any modification, or addition, or equivalent replacement by a person skilled in the art on the basis of this embodiment is within the scope of the invention as claimed.

Claims (8)

1. An impervious liner system for use on a landfill bottom slope, comprising:
compacting the soil protection layer, and forming a plurality of layers of compacted soil by layering and compacting;
the geogrid reinforcement layer is laid on the compacted soil protection layer;
a GCL secondary impermeable layer which is laid on the geogrid reinforcement layer and has the permeability coefficient not more than 5 × 10-9cm/s；
The main anti-seepage layer of the photocuring geomembrane is prepared by mixing unsaturated monomers or low-temperature monomers doped with photoinitiator and carbon black powderSpraying the mixture of polymers on the GCL sub-impermeable layer, irradiating the mixture with ultraviolet light with a certain wavelength to form a continuous photocuring geomembrane after curing, wherein the thickness of the continuous photocuring geomembrane is 1-1.5 mm, and the permeability coefficient is not more than 9 × 10-13cm/s；
The geotextile secondary protective layer is laid on the light-cured geomembrane main impermeable layer; and
and the main protective layer of the geotextile bag is laid on the secondary protective layer of the geotextile and comprises a plurality of geotextile bags filled with sandy soil.
2. The barrier liner system for use on a landfill bottom slope of claim 1, wherein:
wherein the compacted soil protection layer has a permeability coefficient of not more than 1 × 10-5And cm/s, the compacted soil protection layer comprises 3-4 layers of compacted soil, and the thickness of each layer of compacted soil is 15 cm.
3. The barrier liner system for use on a landfill bottom slope of claim 1, wherein:
wherein, the geogrid reinforced layer adopts a unidirectional high-density polyethylene geogrid, and the tensile strength is not lower than 100 kN/m.
4. The barrier liner system for use on a landfill bottom slope of claim 1, wherein:
wherein, the GCL sub-impervious layer has a mass per unit area not less than 4500g/m2The bentonite waterproof pad.
5. The barrier liner system for use on a landfill bottom slope of claim 1, wherein:
wherein, the puncture strength of the secondary protective layer of the geotextile is not less than 580N, and the holding tensile strength is not less than 900N.
6. The barrier liner system for use on a landfill bottom slope of claim 1, wherein:
wherein 70% -80% of sandy soil is filled in the geotextile bag adopted in the geotextile bag main protective layer, and the thickness of the geotextile bag main protective layer is 8-15 cm.
7. A method of constructing a barrier liner system according to any one of claims 1 to 6 for use on a bottom slope of a landfill site, comprising:
step 1, paving clay on the surface of the leveled and compacted side slope and compacting the clay in layers to form a compacted soil protection layer;
step 2, laying a geogrid on the compacted soil protection layer, and filling filler in time after laying to form a geogrid reinforcement layer;
step 3, laying a GCL secondary impermeable layer on the geogrid reinforced layer, wherein the permeability coefficient is not more than 5 × 10-9cm/s；
Step 4, spraying the photocuring liquid on the GCL secondary impermeable layer, spraying a mixed liquid of unsaturated monomers or oligomers doped with a photoinitiator and carbon black powder on the GCL secondary impermeable layer, and irradiating the mixed liquid by ultraviolet light with a certain wavelength to form a continuous photocuring geomembrane serving as a main impermeable layer of the photocuring geomembrane, wherein the thickness of the continuous photocuring geomembrane is 1-1.5 mm, and the permeability coefficient is not more than 9 × 10-13cm/s；
Step 5, laying geotextile on the main impermeable layer of the photocuring geomembrane to form a geotextile secondary protective layer;
and 6, directly placing the geotextile bags on the geotextile secondary protective layer, wherein gaps are not reserved among the geotextile bags, and the geotextile bags are placed in order to form a geotextile bag main protective layer.
8. The construction method according to claim 7, wherein:
wherein, the steps 3, 4 and 6 are constructed in sunny days.
CN201810956308.1A 2018-08-21 2018-08-21 Anti-seepage liner system for bottom slope of refuse landfill and construction method Active CN109137997B (en)

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CN109972665B (en) * 2019-04-10 2024-02-09 深圳宏业基岩土科技股份有限公司 Horizontal permeation-preventing structure with low permeation coefficient
CN111395409A (en) * 2020-05-07 2020-07-10 北京高能时代环境技术股份有限公司 Seepage-proofing structure for emergency site construction and construction method of seepage-proofing structure
CN111663572B (en) * 2020-06-08 2021-07-13 湘潭大学 Composite liner structure for refuse landfill and construction method thereof
CN113622467B (en) * 2021-08-25 2022-08-30 苏州大学 Anti-seepage layer structure of refuse landfill and construction method
CN114192564A (en) * 2021-12-01 2022-03-18 铜陵有色金属集团铜冠建筑安装股份有限公司 Allopatric ectopic remediation method for arsenic-contaminated soil

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CN201554043U (en) * 2009-12-14 2010-08-18 苏州市环境卫生管理处 Middle anti-seepage liner structure for preventing local sinking in refuse landfill
CN102002961A (en) * 2010-10-19 2011-04-06 浙江大学 Impermeable gasket for bottom side slope of refuse landfill
CN103669603A (en) * 2013-11-21 2014-03-26 河海大学 Construction method for overlap joint of geosynthetic clay liners by using photocuring technology

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JP2006316527A (en) * 2005-05-13 2006-11-24 Kansai Electric Power Co Inc:The Method of manufacturing foundation made of hydraulic inorganic molded body
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CN102002961A (en) * 2010-10-19 2011-04-06 浙江大学 Impermeable gasket for bottom side slope of refuse landfill
CN103669603A (en) * 2013-11-21 2014-03-26 河海大学 Construction method for overlap joint of geosynthetic clay liners by using photocuring technology

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