CN114134941A - Engineering optimization method for horizontal barrier and organic gas corrosion resistance - Google Patents
Engineering optimization method for horizontal barrier and organic gas corrosion resistance Download PDFInfo
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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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
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0006—Plastics
- E02D2300/0017—Plastics thermoplastic
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0037—Clays
- E02D2300/0039—Clays mixed with additives
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0098—Bitumen
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2450/00—Gaskets
- E02D2450/10—Membranes
- E02D2450/105—Membranes impermeable
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Abstract
The invention discloses an engineering optimization method for horizontal barrier and organic gas erosion resistance, which comprises a horizontal barrier system, wherein the horizontal barrier system is sequentially provided with a polluted soil layer, a compacted clay layer, a geosynthetic clay liner, a first geomembrane, a modified asphalt layer, a second geomembrane, a temperature control layer, a protective layer, surface soil and vegetation from bottom to top. According to the invention, the attapulgite is added to improve the water retention capacity of the compacted clay layer, so that organic gas is prevented from diffusing through cracks due to dehydration and cracking of the clay layer; the seepage-proof and gas-barrier performances are enhanced by laying the geosynthetic clay liner, and the geomembrane is protected from being influenced by medium coarse sand and broken stones; the two layers of geomembranes bonded by the modified asphalt provide a complete membrane structure for the horizontal barrier system, and prevent the diffusion of water, organic gas and chemical steam; the temperature control layer is arranged on the surface of the geomembrane, so that the influence of the overground temperature on the soil body can be effectively isolated, and the soil body is prevented from cracking due to water evaporation.
Description
Technical Field
The invention relates to the technical field of pollution site control and treatment, in particular to an engineering optimization method for horizontal barrier and organic gas corrosion resistance.
Background
With the progress of society and economy, industry and agriculture are continuously developed, and simultaneously, the problem of soil pollution is more and more serious, compared with agricultural farmland pollution, the urban industrial pollution has larger pollution degree, complex pollution components and large pollution depth, and urban industrial pollution in China can be divided into four types, including Persistent Organic Pollutants (POPs), organic pollution fields of petroleum, chemical engineering, coking and the like, electronic waste pollution fields and heavy metal pollution fields, wherein the organic pollutants account for a great proportion in the urban industrial pollution.
In the treatment of urban organic pollution sites at home and abroad, landfill occupies a great proportion, and a horizontal barrier system is designed in general landfill engineering, wherein the horizontal barrier system in the field of environmental geotechnical engineering generally comprises an ecological vegetable layer, a surface soil layer, a protective layer, a drainage layer, a geomembrane, a geosynthetic clay liner and a compacted clay liner from top to bottom, wherein the geomembrane, the geosynthetic clay liner and the compacted clay liner are barrier layers and can be used for blocking volatile toxic and harmful gases, in fact, heavy metal ions can hardly permeate the geomembrane, however, adsorption tests and diffusion tests find that organic pollution such as p-xylene, ethylbenzene, o-xylene and toluene can be migrated through the geomembrane, and in addition, domestic and foreign researches find that even if strict Construction Quality Control (CQC) and Construction Quality Assurance (CQA) procedures are carried out, the damage of the geomembrane is inevitable in the actual construction process, most of seepage of the composite liner system is generated by geomembrane damage, and based on the theory of gas-liquid two-phase flow and thermal flow heat-driven dehydration and drying, the geosynthetic clay liner can be dehydrated and dried under a certain temperature gradient (25 ℃/m), the retardant effect on pollutants is seriously influenced, the construction period is longer in the actual construction process, and foreign scholars find that the clay layer can be dehydrated and cracked under the direct sunlight even if the clay layer is covered with the geomembrane and a sand protection layer, and cracks are generated. If the clay is dehydrated and dried, the permeability coefficient of the compacted clay layer is increased by 2 orders of magnitude, which can cause great influence on the overall barrier effect of the composite liner system, therefore, an engineering optimization method for horizontal barrier and organic gas corrosion resistance is provided to solve the problems.
Disclosure of Invention
Based on the technical problems existing in the background art, the invention aims to provide a solution for the common engineering problems of dehydration cracking of a compacted clay layer, dehydration cracking of a geosynthetic clay liner and diffusion and migration of organic gas caused by damage of a geomembrane in the actual construction process of a horizontal barrier system.
The invention provides an engineering optimization method for resisting organic gas erosion for a horizontal barrier system, which comprises the horizontal barrier system, wherein the horizontal barrier system is sequentially provided with a polluted soil layer, a compacted clay layer, a geosynthetic clay liner, a first geomembrane, a modified asphalt layer, a second geomembrane, a temperature control layer, a protective layer, surface soil and vegetation from bottom to top, aiming at the problem that the compacted clay layer is subjected to dehydration cracking under direct sunlight, a certain amount of attapulgite is added into the compacted clay to serve as a water retaining agent, and most cations, water molecules and organic molecules with certain size can be adsorbed due to numerous internal pore channels of the attapulgite, so that a material similar to a natural nano channel is actually formed, and the adsorption effect is similar to a zeolite molecular sieve; aiming at the problem that the geosynthetic clay liner is dehydrated and dried under the gradient, the temperature control layer of XPS (extruded polystyrene heat insulation temperature control plate) with the thickness of 5cm is arranged above the geomembrane, so that the dehydration and cracking of the soil body below the XPS temperature control layer caused by overlarge temperature gradient are effectively prevented; the geomembrane is easy to damage in the construction process, organic pollutants can diffuse and migrate through the geomembrane, two layers of geomembranes are arranged, the two layers of geomembranes are bonded through a sprayed regenerated rubber modified asphalt layer, a geosynthetic clay liner with the thickness of 8mm is laid above a compacted clay layer, and the seepage prevention and air barrier performance of the horizontal separation system is enhanced while the geomembrane is prevented from being damaged.
In the engineering optimization method, the horizontal barrier system is sequentially provided with a polluted soil layer, a compacted clay layer, a geosynthetic clay liner, a first geomembrane, a modified asphalt layer, a second geomembrane, a temperature control layer, a protective layer, surface soil and vegetation from bottom to top.
Wherein:
the mixing amount of the attapulgite in the compacted clay layer is 5 percent, the raw ore of the attapulgite is produced from Jiangsu Xuyi, and the raw ore of the attapulgite is crushed, primarily screened, pulped, filtered, dried and sieved by a 100-mesh sieve;
the thickness of the geosynthetic clay liner is 8mm, a powder type sodium bentonite waterproof blanket is adopted, pre-hydration is carried out for 2 hours before construction, compaction and laying are carried out during construction, permeability test is carried out on a lap joint, the air tightness of the lap joint is checked, and the fact that the lap joint can effectively prevent water, organic gas and chemical steam from diffusing is guaranteed;
the thickness of the first geomembrane is 0.5mm, the thickness of the second geomembrane is 2mm, the first geomembrane and the second geomembrane are both High Density Polyethylene (HDPE) geomembranes, and the basic property parameters of the geomembranes meet the requirements of CJ/T234-2006 high density polyethylene geomembrane for refuse landfills;
the modified asphalt layer is made of regenerated rubber modified asphalt, the preparation method comprises the steps of processing waste rubber into particles with the diameter of less than or equal to 1.5mm, mixing the particles with asphalt, heating and desulfurizing at the temperature of 150-200 ℃, the modified asphalt layer has certain elasticity, plasticity, air tightness, low-temperature flexibility and ageing resistance, an independent sprayer is used for spraying during construction, the thickness of the modified asphalt layer is controlled to be 2mm, a fast-curing film with the characteristics of easy adhesion, elongation and hydrophobicity is formed, and the modified asphalt layer has the effect of blocking organic gas while enhancing the durability of the geomembrane;
an XPS (extruded polystyrene heat insulation and temperature control plate) temperature control layer with the thickness of 5cm is arranged above the second geomembrane, the heat conductivity coefficient of the XPS temperature control layer is less than 0.05, and the joints need to be bonded by grouting to play a role in controlling the temperature gradient of soil below.
An engineering optimization method for organic gas erosion resistance of a horizontal barrier system, comprising the following steps:
s1: digging a soil layer of the polluted site to be restored to an elevation;
s2: uniformly mixing the water-retaining agent and clay, paving the mixture on a polluted soil layer, and compacting the mixture in a layering manner to obtain a compacted clay layer;
s3: paving a geosynthetic clay liner with the thickness of 8 mm;
s4: laying a geomembrane with the thickness of 0.5 mm;
s5: spraying modified asphalt by using an independent sprayer, wherein the thickness of the modified asphalt layer is 2 mm;
s6: paving an earthwork film with the thickness of 2 mm;
s7: laying a temperature control layer and grouting and bonding;
s8: laying a protective layer;
s9: paving planting soil to obtain surface soil;
s10: and (5) planting vegetation.
The invention has the beneficial effects that:
(1) the mixing amount of the attapulgite in the compacted clay layer in the engineering optimization method is 5 percent, the effect of the water-retaining agent is achieved, the compacted clay layer can be prevented from being dehydrated and cracked under direct sunlight in the construction process of the horizontal separation system, and meanwhile, the long-term volume water content of the soil body of the compacted clay layer after optimization is higher than that of the existing common compacted clay layer by more than 10 percent.
(2) The engineering optimization method adopts a geomembrane-compaction clay layer-geomembrane structure, the structure can effectively reduce the breakage incidence rate of the geomembrane in the actual construction process, meanwhile, the existence of the modified asphalt layer can prevent organic gas from penetrating through the geomembrane, and the gas diffusion coefficient of the structure is greatly reduced and is far less than 1 multiplied by 10-6m 2/s.
(3) The thickness of the XPS temperature control layer in the engineering optimization method is 5cm, the temperature gradient of the lower soil body can be effectively reduced under the extreme weather condition in winter or summer, the temperature gradient is smaller than 25 ℃/m, and the soil body is prevented from being dehydrated and cracked due to the thermal gradient effect.
(4) In the engineering optimization method, the attapulgite is a natural clay material, the XPS is a common material on the market, and the reclaimed rubber modified asphalt raw material is asphalt and waste rubber tires, so that the cost is low, the acquisition way is simple, and the waste recycling is realized.
According to the invention, the attapulgite is added to improve the water retention capacity of the compacted clay layer, so that organic gas is prevented from diffusing through cracks due to dehydration and cracking of the clay layer; the seepage-proof and gas-barrier performances are enhanced by laying the geosynthetic clay liner, and the geomembrane is protected from being influenced by medium coarse sand and broken stones; the two layers of geomembranes bonded by the modified asphalt provide a complete membrane structure for the horizontal barrier system, and prevent the diffusion of water, organic gas and chemical steam; the temperature control layer is arranged on the surface of the geomembrane, so that the influence of the overground temperature on the soil body can be effectively isolated, and the soil body is prevented from cracking due to water evaporation.
Drawings
FIG. 1 is a vertical cross-sectional view of an engineering optimization method for horizontal barrier resistance to organic gas attack according to the present invention;
fig. 2 is an effect diagram of a geomembrane-modified asphalt layer-geomembrane structure;
fig. 3 is a schematic structural diagram of an engineering optimization method for horizontal barrier resistance to organic gas corrosion according to the present invention.
In the figure: 1-vegetation; 2-topsoil; 3-a protective layer; 4-temperature control layer; 5-a second geomembrane; 6-modified asphalt layer; 7-a first geomembrane; 8-geosynthetic clay liner; 9-compacting the clay layer; 10-polluted soil layer.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example one
The invention provides an engineering optimization method for horizontal barrier and organic gas erosion resistance, wherein a horizontal barrier system (shown in figure 1) is sequentially provided with a polluted soil layer 10, a compacted clay layer 9, a geosynthetic clay liner 8, a first geomembrane 7, a modified asphalt layer 6, a second geomembrane 5, a temperature control layer 4, a protective layer 3, surface soil 2 and vegetation 1 from bottom to top, and the structural effect diagram of the geomembrane-modified asphalt layer-geomembrane is shown in figure 2.
Wherein:
the mixing amount of the attapulgite in the compacted clay layer 9 is 5 percent, the raw ore of the attapulgite is produced from Jiangsu Xuyi, and the raw ore of the attapulgite is crushed, primarily screened, pulped, filtered and dried and then screened by a 100-mesh sieve for later use;
the rammed clay is local clay, the clay is dried for more than 12 hours before use, the clay and attapulgite are uniformly mixed with water, the mixture is spread on a polluted soil layer and is rammed in layers, each 20cm of clay is rammed once, the thickness of the rammed clay is not more than 15cm, the total thickness of the rammed clay is controlled to be about 60cm, and the permeability coefficient of the rammed clay is less than 1 x 10-7 cm/s;
the thickness of the geosynthetic clay liner 8 is 8mm, a powder type sodium bentonite waterproof blanket is adopted, pre-hydration is required for 2 hours before construction, compaction and laying are carried out during construction, permeability test is required to be carried out on a lap joint and the air tightness is checked, the permeability coefficient is less than 5 multiplied by 10 < -9 > cm/s, and the geosynthetic clay liner can effectively prevent the diffusion of water, organic gas and chemical steam;
the thickness of the first geomembrane 7 is 0.5mm, the thickness of the second geomembrane 5 is 2mm, the two geomembranes are High Density Polyethylene (HDPE) geomembranes, and the basic property parameters of the geomembrane meet the requirements of CJ/T234-2006 high density polyethylene geomembrane for refuse landfill;
the modified asphalt layer 6 is made of regenerated rubber modified asphalt, the preparation method comprises the steps of processing waste rubber into particles with the diameter of less than or equal to 1.5mm, mixing the particles with asphalt, heating and desulfurizing at the temperature of 150-;
the geomembrane-modified asphalt layer-geomembrane structure is constructed according to the method of the invention, and the gas diffusion coefficient of the geomembrane-modified asphalt layer-geomembrane structure is less than 1 multiplied by 10-9m 2/s;
an XPS (extruded polystyrene heat insulation temperature control plate) temperature control layer 4 with the thickness of 5cm is arranged above the second geomembrane, the heat conductivity coefficient of the XPS temperature control layer is less than 0.05, the joint needs to be bonded by grouting, and the grouting liquid is clay slurry and plays a role in controlling the temperature gradient of the soil body below.
Fig. 3 is a construction sequence diagram of a composite horizontal barrier system in a contaminated site.
The construction steps are as follows:
s1: digging a soil layer of the polluted site to be restored to an elevation;
s2: uniformly mixing the water-retaining agent and clay, paving the mixture on a polluted soil layer, and compacting the mixture in a layering manner to obtain a compacted clay layer;
s3: paving a geosynthetic clay liner with the thickness of 8 mm;
s4: laying a geomembrane with the thickness of 0.5 mm;
s5: spraying modified asphalt by using an independent sprayer, wherein the thickness of the modified asphalt layer is 2 mm;
s6: paving an earthwork film with the thickness of 2 mm;
s7: laying a temperature control layer and grouting and bonding;
s8: laying a protective layer;
s9: paving planting soil to obtain surface soil;
s10: and (5) planting vegetation.
(1) In the engineering optimization method, the mixing amount of the attapulgite in the compacted clay layer 9 is 5 percent, the effect of the water-retaining agent is achieved, the compacted clay layer 9 can be prevented from being dehydrated and cracked under direct sunlight in the construction process of the horizontal separation system, and meanwhile, the long-term volume water content of the soil body of the compacted clay layer 9 after optimization is higher than that of the existing common compacted clay layer by more than 10 percent.
(2) The engineering optimization method adopts a geomembrane-compaction clay layer-geomembrane structure, the structure can effectively reduce the breakage incidence rate of the geomembrane in the actual construction process, meanwhile, the existence of the modified asphalt layer can prevent organic gas from penetrating through the geomembrane, and the gas diffusion coefficient of the structure is greatly reduced and is far less than 1 multiplied by 10-6m 2/s.
(3) The thickness of the XPS temperature control layer in the engineering optimization method is 5cm, the temperature gradient of the lower soil body can be effectively reduced under the extreme weather condition in winter or summer, the temperature gradient is smaller than 25 ℃/m, and the soil body is prevented from being dehydrated and cracked due to the thermal gradient effect.
(4) In the engineering optimization method, the attapulgite is a natural clay material, the XPS is a common material on the market, and the reclaimed rubber modified asphalt raw material is asphalt and waste rubber tires, so that the cost is low, the acquisition way is simple, and the waste recycling is realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. An engineering optimization method for horizontal barrier resistance to organic gas erosion comprises a horizontal barrier system, and is characterized in that the horizontal barrier system is sequentially provided with a contaminated soil layer (10), a compacted clay layer (9), a geosynthetic clay liner (8), a first geomembrane (7), a modified asphalt layer (6), a second geomembrane (5), a temperature control layer (4), a protective layer (3), surface soil (2) and vegetation (1) from bottom to top;
the construction steps are as follows:
s1: digging a soil layer of the polluted site to be restored to an elevation;
s2: uniformly mixing the water-retaining agent and clay, paving the mixture on a polluted soil layer, and compacting the mixture in a layering manner to obtain a compacted clay layer;
s3: paving a geosynthetic clay liner with the thickness of 8 mm;
s4: laying a geomembrane with the thickness of 0.5 mm;
s5: spraying modified asphalt by using an independent sprayer, wherein the thickness of the modified asphalt layer is 2 mm;
s6: paving an earthwork film with the thickness of 2 mm;
s7: laying a temperature control layer and grouting and bonding;
s8: laying a protective layer;
s9: paving planting soil to obtain surface soil;
s10: and (5) planting vegetation.
2. The engineering optimization method for horizontal barrier resistance to organic gas erosion as claimed in claim 1, wherein the rammed clay layer (9) is added with water retention agent, and the water retention agent mainly comprises attapulgite.
3. The engineering optimization method for horizontal barrier resistance to attack by organic gases according to claim 1, characterized in that the geosynthetic clay liner (8) protects the geomembrane from medium grit and crushed stone and enhances the barrier and gas barrier properties of the horizontal barrier system.
4. The engineering optimization method for horizontal barrier resistance to organic gas erosion according to claim 1, wherein the thickness of the first geomembrane (7) is 0.5mm, the thickness of the second geomembrane (5) is 2mm, two geomembranes are bonded through reclaimed rubber modified asphalt, and the thickness of the modified asphalt layer is 2 mm.
5. The engineering optimization method for horizontal barrier resistance to organic gas attack according to claim 1, characterized in that an XPS (extruded polystyrene thermal insulation temperature control plate) temperature control layer (4) is arranged between the second geomembrane (5) and the protective layer (3), and the thickness of the temperature control layer (4) is 5 cm.
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| CN101012632A (en) * | 2007-01-12 | 2007-08-08 | 中国科学院寒区旱区环境与工程研究所 | Reinforced ventilating heat-proof foundation |
| CN202742767U (en) * | 2012-09-17 | 2013-02-20 | 唐山德生防水股份有限公司 | Double-sided self-adhesive composite geomembrane |
| CN111042160A (en) * | 2019-12-30 | 2020-04-21 | 东南大学 | Engineering optimization method for resisting hydraulic erosion for slope covering layer system |
| WO2021223358A1 (en) * | 2020-05-07 | 2021-11-11 | 北京高能时代环境技术股份有限公司 | Seepage-proof structure for use in emergency site construction and construction method for seepage-proof structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012632A (en) * | 2007-01-12 | 2007-08-08 | 中国科学院寒区旱区环境与工程研究所 | Reinforced ventilating heat-proof foundation |
| CN202742767U (en) * | 2012-09-17 | 2013-02-20 | 唐山德生防水股份有限公司 | Double-sided self-adhesive composite geomembrane |
| CN111042160A (en) * | 2019-12-30 | 2020-04-21 | 东南大学 | Engineering optimization method for resisting hydraulic erosion for slope covering layer system |
| WO2021223358A1 (en) * | 2020-05-07 | 2021-11-11 | 北京高能时代环境技术股份有限公司 | Seepage-proof structure for use in emergency site construction and construction method for seepage-proof structure |
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