CN207794062U - Compound underground anti-seepage swelling cob wall - Google Patents
Compound underground anti-seepage swelling cob wall Download PDFInfo
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- CN207794062U CN207794062U CN201721780778.4U CN201721780778U CN207794062U CN 207794062 U CN207794062 U CN 207794062U CN 201721780778 U CN201721780778 U CN 201721780778U CN 207794062 U CN207794062 U CN 207794062U
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Abstract
The compound underground anti-seepage swelling cob wall of the utility model, belong to contaminated site isolation recovery technique field, including matrix and isolation features layer, isolation features are placed on the inside of matrix, matrix, which is sprayed by bentonite siccative in slurry coat method, to harden, isolation features layer is tiled by several flexibility function layers, the flexibility function layer lower suspension variable weights of the bottom.The utility model can be according to the specific pollution condition in required isolation place, the effective isolation adsorbed film of selection and the suitable number of plies, keep design more targeted, wall inherently has certain impermeability, isolation features layer has prodigious isolation adsorption capacity, multiple different isolation adsorbed films that the leaching that can effectively obstruct mixed pollutants is used in combination pollutant.
Description
Technical field
The utility model belongs to contaminated site isolation recovery technique field, and in particular to a kind of compound underground anti-seepage swelling
Cob wall.
Background technology
City is industrial production and life compact district, and since the beginning of the eighties in last century, Urbanization in China is very fast
Speed, industry relatively lag behind with municipal and environment-friendly infrastructure construction and operation management level, and China's Urban Underground water and soil is caused to pollute
Getting worse.The definition of soil pollution is：Since harmful, noxious material that mankind's activity generates enter soil, run up to certain
Degree from net energy is to lead to soil property and mass change more than soil itself, constitute influence to human body and ecological environment and
Harm.According to《National Soil Pollution Investigation bulletin》(2014), soil total point exceeding standard rate in China's is up to 16.1%, due to
It drenches with rain and necessarily leads to the percolate containing oxious component the effects that washing away, if do not taken effective seepage control measure, percolate meeting
It is migrated with the seepage flow of underground water, pollutes pollution ecological around place.
There are three main sources for China's Urban Underground water and soil pollution：(1) urban industry enterprise dismantles and move to another place that leave contaminated sites tight
Weight.Urban land is in short supply, and a large amount of poisonous and harmful industrial sites moved or discarded are utilized by redevelopment, and former industrial pollution place is such as
Do not carry out effectively assessment and control measures, easily periphery water and soil is caused to seriously affect.(2) ten hundreds of chemicals storage caverns and
The storage facilities such as storage tank farm leak direct polluted underground water soil.These storage facilities often because design improper, operation management be not good at or
Ageing equipment becomes the direct pollution sources of Urban Underground water and soil environment.China's refined oil Kuku holds up to 78,000,000 cubes within 2015
Rice, about 600,000 tons of oil cause serious pollution through approach such as run, drip, leak every year.(3) city centralization offal treatment
Place pollution prevention level is relatively low, causes that water and soil is circumferentially descended seriously to pollute.Existing more than 1000 seat of city solid waste landfill site in China,
Separately there are the up to ten thousand simple stockyards of city solid waste.China's consumer waste landfill percolate yield is high, is percolated output of fluid and amount of landfill
Ratio can reach 30% or so (U.S. is only 5% or so).Hangzhou, Nanjing, Suzhou, Shanghai, Xi'an, six, Shenzhen city
Typical percolate from garbage filling field pollutant kind and concentration are shown in Table 1.
Pollutant component and concentration (mg/L) in 1.6 Landfills of table
Landfill Leachate Pollutants include mainly 3 types:(1) water soluble organic substance, be represented by COD (COD) or
Total organic carbon (TOC), including volatile fatty acid and fulvic acid class and humic acids compound etc..(2) xenobiotic
Organic matter (XOCs) is mainly derived from family and industrial chemicals, including a series of aromatic hydrocarbons, benzene class
Substance and chlorinated aliphatic hydrocarbon etc..(3) heavy metal pollution, including Cd2+、Cr3+、Cu2+、Pb2+、Ni2+And Zn2+Deng.
The pollution of Urban Underground water and soil has following features：(1) spatial spreading is big, and it is tired to pollute Site evaluation
It is difficult；(2) soil body and underground water pollution coexist, and soil sample chemistry original sample keeps difficulty big in sampling process；(3) with combined pollution
Based on, often there is heavy metal and organic pollution coexists, it is desirable that it is wide to administer restorative procedure applicability；(4) Contaminants Transport depth
Larger, it is high to repair difficulty for complex geologic conditions.Urban Underground water and soil pollution These characteristics are reconnoitred for it, are administered and reparation is brought
Huge Science and Technology challenge.
Insufficient due to administering recovery technique levels, the pollution control reparation of China's Urban Underground water and soil at present mostly uses
Simple dystopy administration way.For example, being the Shanghai World's Fair that the heavy industry using metal as raw material or processing object is concentrated originally
Garden place is polluted by serious heavy metal and persistent organism, and most of pollution plot is administered (to be dug using displacement method
Pick-outward transport-cleaning earthen backfill)；Three factory of Beijing's original chemical industry with nearly 50 years Chemical Manufacture history, part plant area soil
It is serious by organic pollutions such as tetrabutyltin, dioctyl phthalates, using disposition is excavated when improvement, by high-enriched organics
Contaminated soil burning disposal, slight pollution soil are filled.The showering processing cost in municipal pollution place is higher, and difficult
To administer soil and the deeper place of underground water pollution, pollution water and soil under structures can not be repaired or against important building
Contaminated site.
Compared with dystopy is administered and repaired, restorative procedure in situ of administering is not required to excavate the soil body, and rehabilitation cost is low, is suitble to state of China
Feelings.Protect administration's statistics according to the U.S., be completed or the contaminated site recovery project that just carries out in about half repaired using in situ administer,
Wherein vertical antifouling divider wall is most basic and effective technology.Vertical antifouling isolation wall technology is contaminated site prevention and control, repairs
And leave the effective ways of Mini nutritionalassessment pollution control.
Divider wall early stage is mainly used in large-scale or reservoir seepage control project.With the development of technology, as shown in Figure 1 every
It is more and more used in pollution control engineering from wall.Commonly using vertical divider wall engineering can following several class：Soil-swelling
Native divider wall, plastic concrete divider wall, normal concrete divider wall (rigid concrete divider wall), Soil-cement piling wall with
Compound divider wall of geomembrane-bentonite etc..
(1) soil-bentonite divider wall
The materials for wall of soil-bentonite divider wall is by excavating upper and dry bentonite in powder in situ and excavating swollen in groove
The native mud of profit mixes, and bentonite volume is 4%~8%, and solid concentration is about 70% in materials for wall.Soil-bentonite every
It is relatively low from wall permeability, usually 1 × 10-8M/s~5 × 10-11Between m/s.
(2) cement-bentonite divider wall
The materials for wall of cement-bentonite divider wall is matched by ordinary cement, bentonite slurry, water and some additives
It makes, cement mixing content is 10%~15%, and solid concentration is about 20% in materials for wall.Cement-bentonite divider wall intensity
It is higher than soil-bentonite divider wall intensity, the osmotic coefficient ratio soil-order of magnitude greater left and right of bentonite divider wall, about 1 ×
10-8M/s~5 × 10-8m/s。
(3) normal concrete divider wall (rigid concrete divider wall)
Concrete partition wall (rigid concrete divider wall) be primarily referred to as prefabricated or cast in situs armored concrete every
From wall, such divider wall intensity is big.
(4) plastic concrete divider wall
Plastic concrete divider wall is mainly made of cement, clay (or bentonite), stone and sand, and cement mixing content 3%~
10%.Plastic concrete divider wall has the characteristics that deformation modulus is small, limiting strain is big, can be by changing material mix proportion people
For control deform the amount of touching.
(5) cement mixing method divider wall
Cement mixing method divider wall is that curing agent (materials such as cement, lime) is sprayed into weak soil using deep mixer
Layer depth portion makes curing agent be sufficiently mixed with the soil body under construction machinery stirring, and with the soil body a series of physical chemistry occurs for curing agent
Reaction, forms the divider wall of hypotonicity, infiltration coefficient 1 × 10-9M/s~5 × 10-10m/s。
(6) the compound divider wall of geomembrane-bentonite
The compound divider wall of geomembrane-bentonite is made of geomembrane and materials for wall.Grooving is excavated using groover,
Geomembrane and backfill materials for wall (such as cement bentonite hardening slurry, soil-bentonite mixture etc.), shape are laid in groove
At compound divider wall.
Country variant is to the difference that stresses also of vertical divider wall type, and the European countries such as Britain are mainly using cement-
The vertical divider wall of bentonite, and the U.S. mainly uses soil-vertical divider wall of the swelling soil series, China mostly uses cement (plasticity at present
Concrete or soil cement) grouting curtain is as main divider wall form, to obstruct percolate in landfill yard.
As shown in table 2, on the one hand, existing common divider wall due to drying and watering cycle and Frozen-thawed cycled influence, long-term
Anti-seepage effect can weaken after military service, on the other hand, in face of increasingly complicated water and soil pollution situation, the vertical antiseepage of single structure every
It has been difficult to meet complicated pollution situation from wall.Some researches show that the presence of certain heavy metals can hinder hydrated cementitious, and
It exerts an adverse impact in a long time to solidified cement body, reduces the intensity of cut-pff wall, and generate perforation in firming body
Crack makes wall lose antiseepage isolation effect, so needing the phase of consideration cement and pollutant when using cement system cut-pff wall
Capacitive.Although bentonite is better than cement for the compatibility of pollutant, the cut-pff wall intensity formed is relatively low, application range by
Limitation, and the antiseepage barrier property of wall is generally difficult to reach the anti-of code requirement under the erosion of the combined pollutant of high concentration
Ooze standard.
Table 2. commonly uses vertical divider wall disadvantage
Obstructing capacity of 3. geomembrane of table for pollutant
P-poor (poor), G-generallygoodresistance (good), IIR-Butylrubber (butyl rubber),
CPE-Chlorinatedpolyethylene (haloflex), CSM-Chlorosulfonatedpolyethylene (chlorine sulphur
Change polyethylene rubber), ECO-epichlorohydrincopolymer (copoly type epichlorohydrin rubber), EPDM-
Ethylenepropylenedienemonomer (ethylene propylene diene rubber), CR-Polychloroprene (neoprene), PE-
Polyethylene (polyethylene), PVC-Polyvinylchloride (polyvinyl chloride)
Although the compound divider wall permeability coefficient of geomembrane-bentonite is low, about 1 × 10-10M/s, isolation effect is good, so
And often there is various heavy and the case where organic equal pollutants coexist often based on combined pollution in contaminated site in engineering,
Pollution condition is extremely complex, on the one hand, the earth working material of conventional single kind has certain limitation, and complicated pollution condition
Under, a large amount of pollutants of percolate and its carrying are easier to puncture barrier, service life are greatly shortened, so this single structure
Divider wall be difficult to meet it is complicated every dirty antiseepage requirement；On the other hand, the strength of wall body of bentonite clay material is low, the scope of application by
To limitation.
Utility model content
The purpose of this utility model is to provide a kind of compound underground anti-seepage swelling cob wall, to solve the above problems.
To achieve the goals above, the technical solution adopted in the utility model is：
The compound underground anti-seepage swelling cob wall of the utility model, including matrix and isolation features layer, isolation features are placed on
On the inside of matrix, matrix, which is sprayed by bentonite siccative in slurry coat method, to harden, and isolation features layer is put down by several flexibility function layers
It spreads, the flexibility function layer lower suspension variable weights of the bottom.
Flexibility function layer includes 2 layers of geotextiles, and at least one layer of isolation adsorbed film is equipped among geotextiles.
Isolation adsorbed film be polythylene resin film, polyacrylonitrile carbon based fibers film, fluorubber, silicon rubber, fluorine silicone rubber,
One kind in electro spinning nanometer fiber membrane, mesoporous carbon/Si oxide compound film or the compound high hydroscopic resin of acrylamide.
The polythylene resin film is high density polyethylene (HDPE) (HDPE) resin film.
The beneficial effects of the utility model are：
The compound underground anti-seepage swelling cob wall of the utility model, can be according to the specific pollution condition in required isolation place, choosing
Effective isolation adsorbed film and the suitable number of plies are selected, keeps design more targeted, in compound underground anti-seepage swelling earth wall construction,
On the one hand, wall inherently has certain impermeability, and on the other hand, isolation features layer has prodigious isolation for pollutant
The leaching that can effectively obstruct mixed pollutants is used in combination in adsorption capacity, multiple different isolation adsorbed films.The association of these two aspects
Same-action greatly reduces the possibility that polluter leaches in place, is provided " multiple security " for engineering；Isolation features layer
It is set to the interior survey of divider wall, it is possibility to have erosion of the prevention pollutant of effect for bentonite wall.
Description of the drawings
Fig. 1 is the structural schematic diagram of the compound underground anti-seepage swelling cob wall of the utility model；
Fig. 2 is the structural schematic diagram of flexibility function layer；
In figure：1, matrix, 2, isolation features layer, 3, variable weights, 4, flexibility function layer, 5, geotextiles, 6, isolation adsorbed film.
Specific implementation mode
Specific embodiment of the present utility model is made into one by the description to optimum embodiment below against attached drawing
Step detailed description.
As illustrated in fig. 1 and 2, the compound underground anti-seepage swelling cob wall of the utility model, including matrix 1 and isolation features layer 2,
Isolation features layer 2 is placed in 1 inside of matrix, and matrix 1, which is sprayed by bentonite siccative in slurry coat method, to harden, isolation features layer 2
It is tiled by several flexibility function layers 4, the flexibility function layer lower suspension variable weights 3 of the bottom.
Flexibility function layer 4 includes 2 layers of geotextiles 5, and at least one layer of isolation adsorbed film 6 is equipped among geotextiles 5.
Isolation adsorbed film 6 is polythylene resin film, polyacrylonitrile carbon based fibers film, fluorubber, silicon rubber, fluorine silicon rubber
One kind in glue, electro spinning nanometer fiber membrane, mesoporous carbon/Si oxide compound film or the compound high hydroscopic resin of acrylamide.
Polythylene resin film is high density polyethylene (HDPE) (HDPE) resin film.
Embodiment 1
Since the change of urban planning is with greater need for factory site resettlement is carried out, sheet has been left in genuine location for certain plant area of Chemical Co., Ltd.
Contaminated site, pollutant is mainly oil pollution and heavy metal pollution in place.Three layers are distributed in this contaminated area ground closely
The clay of 13m thickness, at impermeable stratum about 17m located underground.
Pollutant is carried out using compound underground anti-seepage swelling cob wall described in the utility model for the above situation
It is isolated, the isolation features layer of the compound underground anti-seepage swelling cob wall used in the present embodiment uses fluorubber coiled material and high density
The thickness of polyethylene (HDPE) resin film, compound underground anti-seepage swelling cob wall is 500mm, and wall end stretch enters impermeable stratum
500mm。
Project measures wall saturation permeability coefficient 1 × 10 after being completed-11M/s or so is not detected in the underground water outside wall
Pollutant, by nearly use in 5 years, infiltration coefficient not significant change is still good for the iris action of pollutant, uses
Period, monitored quality of groundwater was normal, demonstrated the validity and reliability of scheme.
Claims (4)
1. a kind of compound underground anti-seepage swelling cob wall, which is characterized in that including matrix (1) and isolation features layer (2), work(is isolated
Ergosphere (2) is placed on the inside of matrix (1), and matrix (1), which is sprayed by bentonite siccative in slurry coat method, to harden, isolation features layer
(2) it is tiled by several flexibility function layers (4), the flexibility function layer lower suspension variable weights (3) of the bottom.
2. compound underground anti-seepage swelling cob wall according to claim 1, which is characterized in that flexibility function layer (4) includes 2
Layer geotextiles (5), geotextiles (5) are intermediate to be equipped at least one layer of isolation adsorbed film (6).
3. compound underground anti-seepage swelling cob wall according to claim 2, which is characterized in that isolation adsorbed film (6) is poly-
Vinyl resins film, polyacrylonitrile carbon based fibers film, fluorubber, silicon rubber, fluorine silicone rubber, electro spinning nanometer fiber membrane, mesoporous carbon/
One kind in Si oxide compound film or the compound high hydroscopic resin of acrylamide.
4. compound underground anti-seepage swelling cob wall according to claim 3, which is characterized in that the polythylene resin film
For high density polyethylene (HDPE) (HDPE) resin film.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721780778.4U CN207794062U (en) | 2017-12-19 | 2017-12-19 | Compound underground anti-seepage swelling cob wall |
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| CN201721780778.4U CN207794062U (en) | 2017-12-19 | 2017-12-19 | Compound underground anti-seepage swelling cob wall |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914374A (en) * | 2021-09-30 | 2022-01-11 | 中节能大地（杭州）环境修复有限公司 | Construction method of flexible barrier wall of refuse landfill suitable for high water level condition |
| CN115651421A (en) * | 2022-11-09 | 2023-01-31 | 山东科技大学 | Slow-release controllable grouting water plugging material and preparation method and application thereof |
-
2017
- 2017-12-19 CN CN201721780778.4U patent/CN207794062U/en not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914374A (en) * | 2021-09-30 | 2022-01-11 | 中节能大地（杭州）环境修复有限公司 | Construction method of flexible barrier wall of refuse landfill suitable for high water level condition |
| CN115651421A (en) * | 2022-11-09 | 2023-01-31 | 山东科技大学 | Slow-release controllable grouting water plugging material and preparation method and application thereof |
| CN115651421B (en) * | 2022-11-09 | 2023-08-22 | 山东科技大学 | Slowly-releasing controllable grouting water plugging material, and preparation method and application thereof |
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| GR01 | Patent grant | ||
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Decision date of declaring invalidation: 20210624 Decision number of declaring invalidation: 50162 Granted publication date: 20180831 |
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