CN105672365A - GCL vertical anti-seepage wall and preparation method thereof - Google Patents
GCL vertical anti-seepage wall and preparation method thereof Download PDFInfo
- Publication number
- CN105672365A CN105672365A CN201610204661.5A CN201610204661A CN105672365A CN 105672365 A CN105672365 A CN 105672365A CN 201610204661 A CN201610204661 A CN 201610204661A CN 105672365 A CN105672365 A CN 105672365A
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- Prior art keywords
- sodium
- gcl
- based bentonite
- impermeable wall
- bentonite waterproof
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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
- E02D31/006—Sealing of existing landfills, e.g. using mining techniques
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0085—Geotextiles
- E02D2300/009—Geotextiles with multi-layer structure
- E02D2300/0092—Geotextiles with multi-layer structure including a liquid tight layer
- E02D2300/0093—Geotextiles with multi-layer structure including a liquid tight layer including bentonite
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Hydrology & Water Resources (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
- Processing Of Solid Wastes (AREA)
- Revetment (AREA)
Abstract
The invention discloses a GCL vertical anti-seepage wall and a preparation method thereof. The GCL vertical anti-seepage wall comprises a vertical anti-seepage wall body, wherein a sodium-based geosynthetic clay liner is fixed at the outer side of the vertical anti-seepage wall body, and the sodium-based geosynthetic clay liner comprises a vertical anti-seepage structure and a top fixation structure. The anti-seepage wall disclosed by the invention has a low permeability coefficient, and is good in bonding with a soil mass, and high in anti-seepage effect.
Description
Technical field
The present invention relates to antiseepage field, be specifically related to a kind of GCL vertical impermeable wall and preparation method thereof.
Background technology
There is hidden leakage defect in dykes and dams, soot etc.; drastically influence the safety of people and living environment; enhancing along with environmental protection consciousness; the research of the antiseepage of antiseepage especially soot is got more and more by people; domestic early stage has built many easy refuse landfills, and these old refuse landfills are mostly directly toppled at low-lying land, it does not have do any Anti-seeping technology; pollutant directly spread towards periphery, thus contaminated soil and subsoil water. For antiseepage, mainly do horizontal leakage preventing before, but vertical seepage control is also a critically important aspect of seepage control project.
Meanwhile, at the danger waste landfill site that environmental protection is higher ranked, on the basis doing horizontal leakage preventing, it is also desirable to do vertical seepage control. Existing vertical impermeable wall can be divided into rigidity cut-pff wall, plasticity cut-pff wall and flexible barrier wall. Rigidity cut-pff wall has load-bearing and antiseepage effect concurrently, if but only utilize its barrier characteristics, there is distinct disadvantage in rigidity cut-pff wall, as elastic modelling quantity is high, it is easily generated stress concentration and crack occurs, be connected with basic part extremely difficult, it is easy to form hidden leakage defect position, demolition of concrete antiseeping wall difficulty is very big, affects the shortcomings such as follow-up development & construction. Plasticity cut-pff wall is the cut-pff wall technology that the shortcoming according to rigidity cut-pff wall improves, its low-intensity replacing part of cement in normal concrete with the admixture such as bentonite, clay and being formed, low elastic modulus cut-pff wall material, but it is improved the deficiency of rigidity cut-pff wall, problem above can not be fully solved. The current more application of flexible barrier wall in hydraulic engineering, have that construction is simple, low, the construction site similar to surrounding soil of construction costs can the feature such as development & construction again, but its barrier performance is difficult to meet < 1 × 10-7The environmental requirement of cm/s. Curtain cut-pff wall technology is HDPE geomembrane vertical impermeable wall, it can arrive good anti-seepage effect, but its technical difficulty is higher, construction costs is expensive, and HDPE geomembrane can not be completely combined with surrounding soil, when cut-pff wall generation geology moves, geomembrane and surrounding soil can be easily separated, thus affecting construction quality. The total shortcoming of above cut-pff wall is only to have buffer action, even if infiltration coefficient can reach technology requirement, but has percolate and passes through, so that harmful substance contaminated soil therein and subsoil water.
Summary of the invention
The invention provides a kind of cut-pff wall, overall barrier performance is good, and sodium-based bentonite waterproof carpet therein can be combined closely with the soil body of surrounding.
The preparation method that present invention also offers a kind of cut-pff wall.
A kind of cut-pff wall, including vertical cut-pff wall body, described vertical cut-pff wall outer body is fixed with sodium-based bentonite waterproof carpet, and described sodium-based bentonite waterproof carpet includes vertical seepage control structure and top fixed structure.
Further, described sodium-based bentonite waterproof carpet is powder-type sodium-based bentonite waterproof carpet, and the grammes per square metre of described powder-type sodium-based bentonite waterproof carpet is 3800-4500g/m2。
Further, the infiltration coefficient < 5 × 10 of described sodium-based bentonite waterproof carpet-9cm/s。
Further, described top fixed structure is that described sodium-based bentonite waterproof carpet top outer is provided with anchoring groove.
Further, waterproof blanket is formed by the bar shaped GCL overlap joint that width is 4-8m, and overlapping regions intersection width is more than 50cm, and overlapping regions is smeared overlap joint cream and sealed, and when lapping direction is with construction, the flow direction of mud is consistent.
On the other hand, the preparation method of a kind of cut-pff wall, comprise the steps:
Excavation groove; Back side inwall at described groove lays sodium-based bentonite waterproof carpet, is fixed at described sodium-based bentonite waterproof carpet top; Then in the groove being equipped with sodium-based bentonite waterproof carpet perfusion can self-solidifying mud, treat that mud solidifies and obtains described cut-pff wall.
Further, described top is fixing adopts anchoring groove to fix.
Further, described sodium-based bentonite waterproof carpet is made up of the bentonite bed between two-layer geotextile layer and two-layer geotextile layer, and the grammes per square metre of described sodium-based bentonite waterproof carpet is 3800-4500g/m2。
Further, described following component can be included in mass fraction by self-solidifying mud: bentonite 8-12%, silty clay 30-60%, additive 8-12%, water accounting 20-30%.
Compared with prior art, the present patent application at least has the advantages that
Adding sodium-based bentonite waterproof carpet layer in the cut-pff wall of the present patent application, sodium-based bentonite waterproof carpet not only can improve the barrier performance of cut-pff wall, and can combine closely with the soil body of surrounding, and engineering plays the effect of stable reinforcement.
Bentonite in sodium-based bentonite waterproof carpet layer and self-solidifying mud can active adsorption and harmful substances isolation, it is possible to be substantially reduced the harmful substance in percolate.
The invention belongs to mud wall class flexible barrier wall, construction is simple, construction costs is low, good seepage-proof property, does not affect place subsequent development construction.
Accompanying drawing explanation
Fig. 1 is the soot structural representation with GCL vertical impermeable wall of embodiment in GCL vertical impermeable wall of the present invention.
Detailed description of the invention
Below in conjunction with concrete preferred embodiment, technical scheme is further elaborated, it will be appreciated that preferred embodiment is intended merely to the understanding facilitating the present invention program, not as the restriction of protection domain.
The preparation method of a kind of cut-pff wall, comprises the steps:
(1) excavation groove: be the groove of 70cm at soot periphery excavation width, groove vertical direction is deep into below impermeable stratum 50cm, it is therefore an objective to form overall seepage control system, it is prevented that percolate oozes out from cut-pff wall lower end
(2) laying powder-type sodium-based bentonite waterproof carpet (GCL) at the back side inwall of described groove, the grammes per square metre of described powder-type GCL is 3800g/m2; Described powder-type GCL is made up of the bentonite bed between two-layer geotextile layer and two-layer geotextile layer;
Need exist for illustrating: it is fast that powder-type GCL meets water-responsive speed, the barrier performance of excellence can be reached under relatively low grammes per square metre, and low grammes per square metre is conducive to construction.Meanwhile, require in antiseepage in less strict and the engineering of limited budget, it is also possible to select granular pattern GCL, graininess GCL relative low price, stripping performance good, but granular pattern GCL grammes per square metre >=4500g/m2Just playing good barrier performance, grammes per square metre is higher makes troubles to construction, and it meets water-responsive speed relatively slowly, and the barrier performance after aquation is complete is also much smaller than powder-type GCL.
GCL both sides are non-woven fabrics and woven cloth, it is possible to be well combined with the soil body of surrounding. GCL structure is uniformly be fixed with one layer of sodium bentonite between two-layer geotextile, bentonite is met water and is expanded, the coefficient of expansion is up to 24ml/2g, and bentonite expands in the confined space that two-layer geotextiles is formed and forms fine and close impervious barrier, thus reaching good anti-seepage effect.
Sodium bentonite forms high density diaphragm under water pressure condition, and when thickness is about 3mm, its water penetration is equivalent to the 30cm thickness clay of 100 times, has very strong from water retention property.
(3) then in the groove being equipped with powder-type sodium-based bentonite waterproof carpet perfusion can self-solidifying mud, treat that mud solidifies and obtains described cut-pff wall; Wherein can include following component by self-solidifying mud: bentonite 10%, silty clay 50%, additive 10%, water accounting 30%.
Additive can adopt the additive that cement, flyash etc. are commonly used in the art; The ratio of various components can regulate as required, and range of accommodation is bentonite 8-12%, silty clay 30-60%, additive 8-12%, water accounting 20-30%.
Need exist for illustrating: mud wall is mainly composed of sodium bentonite and silty clay, and GCL infiltration coefficient < 5 × 10-9Cm/s, the barrier performance of its excellence makes whole cut-pff wall system barrier performance reach Environmental Design requirement, mud wall belongs to flexible wall, the current more application of flexible barrier wall is in hydraulic engineering, and its outstanding feature is elastic modelling quantity construction similar to surrounding soil, easy, cost is low, construction site can development & construction again.
As preferably, adopting the fixing waterproof blanket of anchoring groove, extended the upper end of waterproof blanket, anchoring groove having been dug on the ground of distance excavation groove >=1m, with concrete backfill, anchoring groove can effectively prevent waterproof blanket from gliding. The mode such as piling additionally can be selected fixing.
Need exist for illustrating: when waterproof blanket area is excessive, operation easier can be very big, if but narrower width there will be again the problem splicing leakproof, in order to prevent stitching portion seepage, it is possible to adopt overlapping mode, it should be noted that, overlapping regions intersection width should at more than 50cm, overlapping regions smears overlap joint cream, and when lapping direction is with construction, the flow direction of mud is consistent, so can effectively prevent the flowing of mud from causing the damage of overlapping regions.
In order to adapt to different construction demands, the component of mud wall can be adjusted as required, and the kind of additive can also be adjusted according to the needs of those skilled in the art.
The vertical impermeable wall infiltration coefficient < 1 × 10 prepared by such scheme-7Cm/s, it is possible to meet environmental requirement, the advantage simultaneously having flexible barrier wall concurrently.
For improving the anti-seepage effect of cut-pff wall further, it is possible to selecting overlay film type GCL, namely increase a hdpe layer (HDPE) film in the outside of waterproof blanket, HDPE film is little to the permeability of steam and air, water absorption is low;
Traditional rigidity cut-pff wall and plasticity cut-pff wall have the effect of load bearing wall because of it, part engineering can not substitute, the present invention can according to characters of practical engineering, mud wall in scheme is replaced by plastic concrete wall, rigidity cut-pff wall etc., GCL is combined use with rigidity cut-pff wall and plasticity cut-pff wall, barrier performance can be improved equally, reduce risk of leakage.
Fig. 1 is a kind of soot structural representation with above-mentioned vertical impermeable wall, as shown in Figure 1, soot includes impermeable stratum 1, sanitary fill district 2, mud wall 3, sodium-based bentonite waterproof carpet (GCL) 4, anchoring groove 5, horizontal impervious layer 6, wherein mud wall 3 and GCL4 constitute vertical impermeable wall, and vertical impermeable wall both sides are soil 7, vertical impermeable wall be deep into impermeable stratum 50cm, it is possible to prevent water from junction seepage; Anchoring groove 5 is filled with concrete, it is possible to prevent the sagging of waterproof blanket, makes waterproof blanket keep vertical.
The present patent application does not use up part, and those skilled in the art can select as required, the thickness of such as body of wall, adds suitable additive etc. to meet needs, belongs within the protection domain of the application scheme.
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should be encompassed within protection scope of the present invention. Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (9)
1. a GCL vertical impermeable wall, including vertical impermeable wall body, it is characterised in that described vertical impermeable wall outer body is fixed with sodium-based bentonite waterproof carpet, and described sodium-based bentonite waterproof carpet includes vertical seepage control structure and top fixed structure.
2. GCL vertical impermeable wall according to claim 1, it is characterised in that described sodium-based bentonite waterproof carpet is powder-type sodium-based bentonite waterproof carpet, the grammes per square metre of described powder-type sodium-based bentonite waterproof carpet is 3800-4500g/m2。
3. GCL vertical impermeable wall according to claim 1, it is characterised in that the infiltration coefficient < 5 × 10 of described sodium-based bentonite waterproof carpet-9cm/s。
4. GCL vertical impermeable wall according to claim 1, it is characterised in that described top fixed structure is that described sodium-based bentonite waterproof carpet top outer is provided with anchoring groove.
5. GCL vertical impermeable wall according to claim 1, it is characterized in that, waterproof blanket is formed by the bar shaped GCL overlap joint that width is 4-8m, and overlapping regions intersection width is more than 50cm, overlapping regions is smeared overlap joint cream and is sealed, and when lapping direction is with construction, the flow direction of mud is consistent.
6. the preparation method of a GCL vertical impermeable wall, it is characterised in that comprise the steps:
Excavation groove; Back side inwall at described groove lays sodium-based bentonite waterproof carpet, is fixed at described sodium-based bentonite waterproof carpet top; Then in the groove being equipped with sodium-based bentonite waterproof carpet perfusion can self-solidifying mud, treat that mud solidifies and obtains described cut-pff wall.
7. the preparation method of GCL vertical impermeable wall according to claim 6, it is characterised in that described top is fixing adopts anchoring groove to fix.
8. the preparation method of GCL vertical impermeable wall according to claim 6, it is characterized in that, described sodium-based bentonite waterproof carpet is made up of the bentonite bed between two-layer geotextile layer and two-layer geotextile layer, and the grammes per square metre of described sodium-based bentonite waterproof carpet is 3800-4500g/m2。
9. the preparation method of GCL vertical impermeable wall according to claim 6, it is characterised in that described can include following component in mass fraction by self-solidifying mud: bentonite 8-12%, silty clay 30-60%, additive 8-12%, water accounting 20-30%.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106193079A (en) * | 2016-07-06 | 2016-12-07 | 天津中联格林科技发展有限公司 | The preparation method of GCL vertical impermeable wall |
| CN106320385A (en) * | 2016-10-17 | 2017-01-11 | 天津中联格林科技发展有限公司 | Vertical anti-seepage barrier and construction method thereof |
| CN107780443A (en) * | 2017-12-04 | 2018-03-09 | 天津中联格林科技发展有限公司 | A kind of special GCL composite components of vertical seepage control and its laying method |
| CN108225432A (en) * | 2018-01-18 | 2018-06-29 | 常州工学院 | Refuse landfill cut-pff wall model measurement device and preparation method thereof |
| CN108951675A (en) * | 2017-05-17 | 2018-12-07 | 北京高能时代环境技术股份有限公司 | HDPE geomembrane and bentonite-clay complex vertical cut-pff wall and its construction method of installation |
| CN112523198A (en) * | 2020-12-29 | 2021-03-19 | 青岛建设集团有限公司 | Inclined groove type impervious wall and construction method thereof |
| CN113235553A (en) * | 2021-05-27 | 2021-08-10 | 南京万德斯环保科技股份有限公司 | Sodium bentonite waterproof blanket-cement clay slurry composite vertical separation wall system and construction method thereof |
| CN115387369A (en) * | 2022-09-29 | 2022-11-25 | 成都理工大学 | Flexible impervious structure combining impervious wall and curtain grouting and construction method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106193079A (en) * | 2016-07-06 | 2016-12-07 | 天津中联格林科技发展有限公司 | The preparation method of GCL vertical impermeable wall |
| CN106320385A (en) * | 2016-10-17 | 2017-01-11 | 天津中联格林科技发展有限公司 | Vertical anti-seepage barrier and construction method thereof |
| CN108951675A (en) * | 2017-05-17 | 2018-12-07 | 北京高能时代环境技术股份有限公司 | HDPE geomembrane and bentonite-clay complex vertical cut-pff wall and its construction method of installation |
| CN107780443A (en) * | 2017-12-04 | 2018-03-09 | 天津中联格林科技发展有限公司 | A kind of special GCL composite components of vertical seepage control and its laying method |
| CN107780443B (en) * | 2017-12-04 | 2023-08-11 | 天津中联格林科技发展有限公司 | GCL composite member special for vertical seepage prevention and laying method thereof |
| CN108225432A (en) * | 2018-01-18 | 2018-06-29 | 常州工学院 | Refuse landfill cut-pff wall model measurement device and preparation method thereof |
| CN108225432B (en) * | 2018-01-18 | 2020-04-28 | 常州工学院 | Refuse landfill impervious wall model testing device and manufacturing method thereof |
| CN112523198A (en) * | 2020-12-29 | 2021-03-19 | 青岛建设集团有限公司 | Inclined groove type impervious wall and construction method thereof |
| CN112523198B (en) * | 2020-12-29 | 2022-05-31 | 青岛建设集团股份有限公司 | Inclined groove type impervious wall and construction method thereof |
| CN113235553A (en) * | 2021-05-27 | 2021-08-10 | 南京万德斯环保科技股份有限公司 | Sodium bentonite waterproof blanket-cement clay slurry composite vertical separation wall system and construction method thereof |
| CN115387369A (en) * | 2022-09-29 | 2022-11-25 | 成都理工大学 | Flexible impervious structure combining impervious wall and curtain grouting and construction method thereof |
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