CN111792808A - Geotechnical barrier material for in-situ covering of bottom mud and preparation process - Google Patents
Geotechnical barrier material for in-situ covering of bottom mud and preparation process Download PDFInfo
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- CN111792808A CN111792808A CN202010713049.7A CN202010713049A CN111792808A CN 111792808 A CN111792808 A CN 111792808A CN 202010713049 A CN202010713049 A CN 202010713049A CN 111792808 A CN111792808 A CN 111792808A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
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Abstract
The invention relates to the technical field of in-situ covering of bottom mud, and discloses a geotechnical barrier material for in-situ covering of bottom mud and a preparation process thereof. The geotechnical barrier material for in-situ covering of the bottom mud and the preparation process are novel barrier materials which are designed and researched in a targeted mode according to the in-situ treatment characteristics of the polluted bottom mud and the underwater constructability requirement, construction is simple and convenient, isolation performance is excellent, pollutant diffusion after bottom layer disturbance can be controlled, materials used in a functional layer can be selected according to the characteristics of pollutants, scouring resistance is high, stability and firmness are achieved after laying, and the geotechnical barrier material is one of the preferable materials for the bottom mud in-situ covering technology.
Description
Technical Field
The invention relates to the technical field of in-situ covering, in particular to a geotechnical barrier material for in-situ covering of bottom mud and a preparation process thereof.
Background
The sediment of rivers and lakes is an important accumulation reservoir of pollutants, can accumulate a large amount of pollutants such as heavy metal, nutrient salts such as nitrogen and phosphorus, refractory organic matters and the like, has the content of hundreds of times of water, and keeps certain dynamic balance with a water phase, and when the water environment changes, the pollutants in the sediment can be released to pollute the water again. The polluted bottom mud becomes an important pollution source which harms the water body environment.
At present, the pollution bottom mud control technology mainly comprises an in-situ treatment technology and an ex-situ treatment technology. The in-situ treatment technology is to leave the polluted bottom mud in situ, take measures to prevent the bottom mud pollutants from entering the water body, namely cut off the pollution path of an internal pollution source; the in-situ treatment technologies widely used at present mainly include covering, curing, oxidizing, physical leaching and the like. In-situ covering technology, one or more layers of clean covering materials are laid to stabilize the polluted bottom sediment and physically isolate the pollutants from the upper water body, so that the pollutants in the bottom sediment are effectively prevented from migrating and releasing to the water body and directly contacting aquatic organisms, and the water body quality is improved. The covering is used as the in-situ treatment technology of the bottom mud, has obvious effect of repairing the polluted bottom mud, has low construction cost, can effectively prevent the pollutants in the bottom mud from entering the water body to cause secondary pollution, and is suitable for the bottom mud with both organic pollution and inorganic pollution types.
At present, the used masking materials for in-situ covering of the sediment comprise uncontaminated sediment, cleaning weight materials, bentonite, zeolite, activated carbon, geotechnical materials and the like. Different covering materials are closely related to the effect, for example, the stronger the blocking capability of the covering material is, the lower the penetration capability of the pollutants is, and the weight of the covering material is related to the functions of resisting the water flow disturbance and stabilizing the polluted bottom mud. The geotechnical materials are various in types and functions, can be covered with barrier materials and can also be carriers of other masking materials, and can be designed in a targeted manner according to the types and the site conditions of pollutants, so that the geotechnical materials are increasingly paid attention by scientific research and designers and become one of the key research and development directions for in-situ covering and treatment of the sediment.
In the prior art, the geotechnical covering material is single in structure and performance, generally lighter in weight and easy to float or be jacked by gas generated at the bottom after covering. In addition, the existing material inevitably generates large disturbance to the bottom in the construction process, and the conventional geotechnical material cannot effectively control the migration of the bottom mud, so that the diffusion of bottom mud pollutants is caused, and the treatment effect is influenced.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the geotechnical barrier material for in-situ covering of the sediment and the preparation process thereof, and has the advantage of convenience for underwater construction.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: the geotechnical barrier material comprises a geotechnical barrier material body, wherein the geotechnical barrier material body comprises an impermeable layer, a functional layer and side edges, the impermeable layer and the functional layer are connected into a whole in a needling, sewing or bonding mode, and the side edges are arranged on the periphery of the product.
Preferably, the impermeable layer is a sodium bentonite waterproof blanket and is one of a granular type, a powder type or a film-coated type, and the gram weight is 3-6 kg/m2。
Preferably, the functional layer is positioned above the impermeable layer and is divided into a single-layer structure and a multi-layer structure, and the gram weight of the functional layer is 6-15 kg/m2。
Preferably, the functional layer can be formed by uniformly spreading one layer of functional material and one layer of covering geotextile or multiple layers of functional material and multiple layers of covering geotextile on a production line on line, and can also be formed by stacking one or more layers of processed and formed functional geotextile according to a designed sequence.
Preferably, the gram weight of the covering geotextile for the functional layer top layer is 150-300 g/m2The gram weight of the covering geotextile used in the middle of the multilayer structure is 80-150 g/m2The covering geotextile is non-woven geotextile or woven geotextile.
Preferably, the functional material in the functional layer can be one material or a mixture of multiple materials, the functional material is one or more of sand, gravel, vermiculite, zeolite, activated carbon, diatomite and attapulgite, and the particle size of the functional material is less than or equal to 3 mm.
Preferably, the product is provided with a peripheryThe side is non-woven geotextile with the gram weight of 150-300 g/m2The width of the counter weight is 50-100 cm, and a counter weight is arranged on the outer side of the side edge.
Preferably, the side edges can be the upper non-woven fabric of the impermeable layer or the part of the geotextile covering the top of the functional layer and exceeding the size of the product, and can also be added around the product by a needling, sewing or bonding process.
Preferably, the counterweight on the outer side of the side edge is mainly wrapped by sand, and the weight is determined according to experiments, so that the outer edge of the side edge is ensured to be 5-15 cm faster than the integral descending speed of a product.
Preferably, the impermeable layer and the functional layer are connected into a whole through needling, sewing or bonding, and the total gram weight of the product is 12-20 kg/m2The width of the product is 2-6 m, and the peel strength between the geotextiles in the product is more than or equal to 40N/10 cm; when the connection is carried out by adopting a sewing process, the distance between the sewing lines is less than or equal to 15 cm; when the bonding process is used for bonding, the adhesive is required to meet the requirements of environmental protection and underwater application.
Preferably, the product work progress adopts overlap joint connection, can set up the overlap joint region in one side of product, and the overlap joint region width is 30 ~ 50cm, and the side setting can scribble the sealant in the overlap joint region below this moment, during the laying, and the sealed effect and the environmental protection grade of used sealant must accord with the engineering requirement.
Preferably, when the product is laid on the facility, in order to facilitate the lap joint, a float can be arranged in the lap joint area to indicate the lap joint position.
(III) advantageous effects
Compared with the prior art, the invention provides the geotechnical barrier material for in-situ covering of the bottom mud and the preparation process thereof, and in order to ensure the isolation performance of the material, the invention selects a sodium bentonite waterproof blanket (GCL for short) with excellent anti-seepage performance as an anti-seepage layer, which can effectively isolate and adsorb bottom mud pollutants; the anti-seepage layer GCL is provided with one or more functional layers, one or more functional materials can be selected according to the characteristics of pollutants in the sediment and the actual situation of a field, on one hand, the pollutants in the sediment can be filtered, adsorbed and solidified in a targeted manner, on the other hand, the functional materials have a certain weight, the stability of the product after being laid is ensured, and the product is not influenced by bottom gas and water flow scouring; the top of the functional layer is made of non-woven geotextile with larger gram weight so as to restrain the functional layer material, and the functional layer material has excellent filtering performance and scouring resistance; according to the invention, the side non-woven geotextile with the width of 50-100 cm is arranged on the periphery of the geotextile, the balance weight is arranged on the side, and in the construction process, the descending speed block on the outer edge of the side can form a net to cover the sludge disturbed by construction in the net, so that the sludge is prevented from migrating. In addition, the reverse filtration performance of the non-woven fabric is utilized, water in the bottom mud under the side edge can be discharged, and the bottom mud is solidified and deposited stably.
Drawings
FIG. 1 is a first schematic structural diagram of the present invention;
FIG. 2 is a second schematic structural view of the present invention;
FIG. 3 is a third schematic structural view of the present invention;
fig. 4 is a schematic diagram of the underwater working structure of the present invention.
In the figure: 1. an impermeable layer; 2. a functional layer; 3. a side edge; 4. a sealant; 5. balancing weight; 6. floating; 7. geotechnical barrier material body.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1 to 4, the geotechnical barrier material for in-situ covering of sediment comprises a geotechnical barrier material body 7, wherein the geotechnical barrier material body 7 comprises an impermeable layer 1, a functional layer 2 and side edges 3, the impermeable layer 1 and the functional layer 2 are connected into a whole in a needling, sewing or bonding mode, and the side edges 3 are arranged on the periphery of the product.
The impermeable layer 1 is a sodium bentonite waterproof blanket in a granular type, a powder type or a film covering typeThe gram weight of the rubber is 3-6 kg/m2。
The functional layer 2 is positioned above the impermeable layer 1 and is divided into a single-layer structure and a multi-layer structure, and the gram weight of the functional layer is 6-15 kg/m2。
The functional layer 2 can be formed by uniformly spreading a layer of functional material and a layer of covering geotextile or a plurality of layers of functional material and a plurality of layers of covering geotextile on a production line on line, or can be formed by stacking one or more layers of processed and formed functional geotextile according to a design sequence.
The gram weight of the covering geotextile for the top layer of the functional layer 2 is 150-300 g/m2The gram weight of the covering geotextile used in the middle of the multilayer structure is 80-150 g/m2The covering geotextile is non-woven geotextile or woven geotextile.
The functional material in the functional layer 2 can be one material or a mixture of multiple materials, the functional material is one or more of sand, gravel, vermiculite, zeolite, activated carbon, diatomite and attapulgite, and the particle size of the functional material is less than or equal to 3 mm.
The product is provided with the side edges 3 which are non-woven geotextiles at the periphery, and the gram weight of the non-woven geotextiles is 150-300 g/m2The width of the counter weight is 50-100 cm, and the outer side of the side edge is provided with a counter weight 5.
The side edge 3 can be an upper non-woven fabric of the impermeable layer 1 or a part of the geotextile covering the top of the functional layer 2 and exceeding the size of the product, and can also be added around the product by a needling, sewing or bonding process.
The counter weight 5 outside 3 sides of side is given first place to the grit of parcel, and weight is confirmed according to the experiment, guarantees that 3 outer edges of side are 5 ~ 15cm faster than the whole descending speed of product.
The impermeable layer 1 and the functional layer 2 are connected into a whole by needling, sewing or bonding, and the total gram weight of the product is 12-20 kg/m2The width of the product is 2-6 m, and the peel strength between the geotextiles in the product is more than or equal to 40N/10 cm; when the connection is carried out by adopting a sewing process, the distance between the sewing lines is less than or equal to 15 cm; when the bonding process is used for bonding, the adhesive is required to meet the requirements of environmental protection and underwater application.
The product work progress adopts overlap joint connection, can set up the overlap joint region in one side of product, and the overlap joint region width is 30 ~ 50cm, and side 3 sets up in the overlap joint region below this moment, can scribble sealant 4 in the overlap joint region during laying, and used sealant 4's sealed effect and environmental protection grade must accord with the engineering requirement.
When the product is paved, in order to facilitate lap joint, a buoy 6 can be arranged in the lap joint area to indicate the lap joint position.
In the construction process, the side edge 3 can form a net, and the upper-layer sludge disturbed by construction is covered in the net to prevent the sludge from migrating. In addition, utilize the anti-filter performance of non-woven fabrics, can discharge the water in the bed mud under the side, make the bed mud consolidation deposit stable, and effectively block the bed mud and move.
In conclusion, the geotechnical barrier material for in-situ covering of the bottom mud and the preparation process adopt a multilayer structure to combine the seepage-proofing isolation and the in-situ treatment of the bottom mud; a bottom mud diffusion prevention structure is arranged, so that the disturbance of construction to the bottom is reduced; adopt extra heavy geotechnological material, be convenient for underwater construction, material stability is good.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (12)
1. The utility model provides a sediment is geotechnological barrier material and preparation technology for normal position covers, includes geotechnological barrier material body (7), its characterized in that: the geotechnical barrier material body (7) comprises an impermeable layer (1), a functional layer (2) and side edges (3), the impermeable layer (1) and the functional layer (2) are connected into a whole in a needling, sewing or bonding mode, and the side edges (3) are arranged on the periphery of the product.
2. The geotechnical barrier material for in-situ sediment coverage and the preparation process thereof according to claim 1 are characterized in that: the impermeable layer (1) is a sodium bentonite waterproof blanket and is one of a granular type, a powder type or a film-coated type, and the gram weight is 3-6 kg/m2。
3. The geotechnical barrier material for in-situ sediment coverage and the preparation process thereof according to claim 1 are characterized in that: the functional layer (2) is positioned above the impermeable layer (1) and is divided into a single-layer structure and a multi-layer structure, and the gram weight of the functional layer is 6-15 kg/m2。
4. The geotechnical barrier material for in-situ sediment coverage and the preparation process thereof according to claim 1 are characterized in that: the functional layer (2) can be formed by uniformly paving a layer of functional material and a layer of covering geotextile or a plurality of layers of functional materials and a plurality of layers of covering geotextile on a production line on line, and also can be formed by stacking one or more layers of processed and formed functional geotextile according to a design sequence.
5. The geotechnical barrier material for in-situ sediment coverage and the preparation process thereof according to claim 4, are characterized in that: the gram weight of the covering geotextile for the top layer of the functional layer (2) is 150-300 g/m2The gram weight of the covering geotextile used in the middle of the multilayer structure is 80-150 g/m2The covering geotextile is non-woven geotextile or woven geotextile.
6. The geotechnical barrier material for in-situ sediment coverage and the preparation process thereof according to claim 3, are characterized in that: the functional material in the functional layer (2) can be one material or a mixture of multiple materials, the functional material is one or more of sand, gravel, vermiculite, zeolite, activated carbon, diatomite and attapulgite, and the particle size of the functional material is less than or equal to 3 mm.
7. The geotechnical barrier material for in-situ sediment coverage and the preparation process thereof according to claim 1 are characterized in that: the side edges (3) are arranged around the product and are made of non-woven geotextile with the gram weight of 150-300 g/m2The width of the counter weight is 50-100 cm, and the outer side of the side edge is provided with a counter weight (5).
8. The geotechnical barrier material for in-situ sediment coverage and the preparation process thereof according to claims 1 and 7, are characterized in that: the side edge (3) can be an upper non-woven fabric of the impermeable layer (1) or a part of the top of the functional layer (2) covering the geotextile beyond the size of the product, and can also be added around the product by a needling, sewing or bonding process.
9. The geotechnical barrier material for in-situ sediment coverage and the preparation process thereof according to claims 1 and 7, are characterized in that: the counterweight (5) on the outer side of the side edge (3) is mainly made of wrapped sand, and the weight is determined according to an experiment, so that the outer edge of the side edge (3) is ensured to be 5-15 cm faster than the integral descending speed of a product.
10. The geotechnical barrier material for in-situ sediment coverage and the preparation process thereof according to claim 1 are characterized in that: the impermeable layer (1) and the functional layer (2) are connected into a whole through needling, sewing or bonding, and the total gram weight of the product is 12-20 kg/m2The width of the product is 2-6 m, and the peel strength between the geotextiles in the product is more than or equal to 40N/10 cm; when the connection is carried out by adopting a sewing process, the distance between the sewing lines is less than or equal to 15 cm; when the bonding process is used for bonding, the adhesive is required to meet the requirements of environmental protection and underwater application.
11. The geotechnical barrier material for in-situ sediment coverage and the preparation process thereof according to claim 1 are characterized in that: the product work progress adopts overlap joint connection, can set up the overlap joint region in one side of product, and the overlap joint regional width is 30 ~ 50cm, and side (3) set up in the overlap joint region below this moment, can scribble sealant (4) in the overlap joint region during laying, and the sealed effect and the environmental protection grade of used sealant (4) must accord with the engineering requirement.
12. The geotechnical barrier material for in-situ sediment coverage and the preparation process thereof according to claim 1 are characterized in that: when the product is paved, in order to facilitate lap joint, a buoy (6) can be arranged in the lap joint area to indicate the lap joint position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010713049.7A CN111792808A (en) | 2020-07-22 | 2020-07-22 | Geotechnical barrier material for in-situ covering of bottom mud and preparation process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010713049.7A CN111792808A (en) | 2020-07-22 | 2020-07-22 | Geotechnical barrier material for in-situ covering of bottom mud and preparation process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113072274A (en) * | 2021-04-14 | 2021-07-06 | 云南智德环保科技有限公司 | In-situ treatment device and method for endogenous pollution of rivers and lakes |
| CN113152373A (en) * | 2021-03-24 | 2021-07-23 | 重庆水利电力职业技术学院 | Bottom mud covering device for blocking and treating river water source pollution |
| CN113233722A (en) * | 2021-04-30 | 2021-08-10 | 复旦大学 | Ecological film-coating material for bottom sediment pollutant control and preparation method thereof |
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| CN113233722B (en) * | 2021-04-30 | 2022-08-19 | 复旦大学 | Ecological film-coating material for bottom sediment pollutant control and preparation method thereof |
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