CN111945791A - Vertical separation system for polluted site and construction method - Google Patents
Vertical separation system for polluted site and construction method Download PDFInfo
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- CN111945791A CN111945791A CN202010838014.6A CN202010838014A CN111945791A CN 111945791 A CN111945791 A CN 111945791A CN 202010838014 A CN202010838014 A CN 202010838014A CN 111945791 A CN111945791 A CN 111945791A
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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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
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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
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a polluted site vertical blocking system and a construction method thereof, wherein the polluted site vertical blocking system comprises an underground continuous wall and a plurality of high-pressure jet grouting secant piles, the underground continuous wall is vertically arranged around a polluted site, and each high-pressure jet grouting secant pile is distributed on the inner side of a joint of adjacent underground continuous walls and at an inflection point internal corner. The invention provides a polluted site vertical blocking system and a construction method thereof, wherein the polluted site vertical blocking system mainly comprises an underground continuous wall and a high-pressure jet grouting secant pile which jointly form a blocking system meeting the anti-seepage requirement, and has the characteristics of wide applicable geological conditions, reliable technology and easy engineering implementation; the contaminated site vertical separation system is simple in construction method, strong in operability and convenient to popularize.
Description
Technical Field
The invention belongs to the technical field of soil remediation, and particularly relates to a vertical blocking system for a polluted site and a construction method.
Background
With the rapid development of social economy, the accelerated urbanization process and the deepened adjustment of industrial structures, a plurality of main urban areas of cities are subjected to non-ferrous metal smelting, petroleum processing, chemical industry, coking, electroplating, tanning and the migration of enterprises in industries such as dangerous waste storage, utilization and disposal activities out of the cities, a large number of sites with environmental risks are left, heavy metals or organic pollutants in the polluted sites pollute soil and underground water for a long time, the ecological environment and the human health are greatly threatened, and the pollution risk of the sites for redevelopment of the cities is effectively controlled, so that the method becomes the key of the soil pollution prevention and control work.
The risk blocking can cut off the exposure path and pollution plume migration of pollutants in the polluted site, and can not thoroughly remove pollutants or reduce the concentration of the pollutants in the polluted site, so that the risk blocking technology can be independently used for risk control of the polluted land, and can also be used in combination with other soil remediation technologies to achieve the remediation goal.
In a place where partial soil and underground water are polluted, the in-situ remediation technology is independently carried out or the underground water pumping treatment difficulty and the treatment amount are large, and a waterproof curtain needs to be built by matching with the vertical barrier technology, so that the remediation activity is smoothly developed.
Disclosure of Invention
In order to solve the above problems, a vertical blocking system and a construction method for a contaminated site are proposed for solving the above problems, which can be used for blocking a target site pollution source such as treatment and remediation or risk control of an organic contaminated site, a heavy metal contaminated site and a composite contaminated site, so as to ensure smooth proceeding of the treatment and remediation of the contaminated site, and realize risk control and safe utilization of the contaminated site, such as soil around the contaminated site, underground water environment, human health and the like.
In order to achieve the purpose, the invention provides the following technical scheme:
a vertical barrier system for a contaminated site includes an underground continuous wall vertically disposed around the contaminated site.
Furthermore, the vertical blocking system for the polluted site further comprises a plurality of high-pressure jet grouting secant piles, and each high-pressure jet grouting secant pile is distributed on the inner side of the joint of the adjacent underground continuous walls and at the corner internal corner.
Preferably, the thickness of the underground continuous wall is 0.6m-1.5 m.
Preferably, the underground continuous wall is composed of a plurality of continuous walls of unit groove sections, and the length of each unit groove section of the underground continuous wall is 4-6 m.
Further, the underground continuous wall is formed by the permeability coefficient of less than 10-6The material of cm/s is cast in situ.
Preferably, the underground continuous wall is formed by pouring plastic concrete or impervious concrete in situ.
Furthermore, the high-pressure jet grouting secant pile is formed by mutually meshing 2-4 jet grouting piles, and the pile diameter of each jet grouting pile is 0.5-1.2 m.
A construction method of a vertical barrier system of a polluted site comprises the following steps:
s1, determining the pollution range of the site: and determining the pollution range of the site according to the site investigation and evaluation result.
S2, arranging a guide wall: and constructing a guide wall outside the range of the polluted site according to the site utilization status and the geological condition.
S3, grooving construction: and determining the position of a top plate of the water-resisting layer according to the geological conditions of the site, and calculating the grooving depth of the vertical blocking system of the polluted site.
S4, building underground continuous walls: and sequentially pouring impervious materials at the hole sections after grooving.
S5, constructing the high-pressure jet grouting secant pile: and occlusion jet grouting piles are arranged at the inner sides of the joints of the adjacent underground continuous walls and the internal corners of the inflection points.
Further, the position of the guide wall is 1-10 m outside the range of the polluted site.
Further, the grooving depth of the vertical blocking system of the polluted site is 0.5-3 m below a water-resisting layer top plate below the polluted area.
Advantageous effects
The invention provides a polluted site vertical blocking system and a construction method thereof, wherein the polluted site vertical blocking system mainly comprises an underground continuous wall and a high-pressure jet grouting secant pile which jointly form a blocking system meeting the anti-seepage requirement, and has the characteristics of wide applicable geological conditions, reliable technology and easy engineering implementation; the contaminated site vertical separation system is simple in construction method, strong in operability and convenient to popularize.
Drawings
FIG. 1 is a schematic view of a vertical barrier system in combination with a contaminated site according to an embodiment 1 of the present invention;
FIG. 2 is a schematic view showing the structure of a vertical barrier system according to embodiment 1 of the present invention;
fig. 3 is a flowchart of a method for constructing a vertical barrier system according to embodiment 1 of the present invention.
In the drawings: 100-guide wall, 200-polluted site vertical blocking system, 210-underground continuous wall, 220-high-pressure jet grouting secant pile, 300-waterproof layer top plate, 400-waterproof layer and 500-polluted site.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following description is given for clear and complete description of the technical solution of the present invention with reference to the embodiments of the present invention, and other similar embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.
Detailed description of the preferred embodiment 1
In the target site of the embodiment, due to production accidents of peripheral petrochemical plants, organic pollutants such as petroleum hydrocarbon in the soil of the underground layer and underground water exceed the standard.
In view of the above, a contaminated site vertical barrier system 200 is provided, as shown in fig. 1-2, which includes an underground continuous wall 210, wherein the underground continuous wall 210 is vertically disposed around a contaminated site 500.
Further, the vertical blocking system 200 for the polluted site further comprises a plurality of high-pressure jet grouting secant piles 220, wherein the high-pressure jet grouting secant piles 220 are arranged, and each high-pressure jet grouting secant pile 220 is distributed on the inner side of the joint of the adjacent underground continuous walls 210 and at the corner reentrant corner.
Preferably, the underground continuous wall 210 has a thickness of 0.6m to 1.5 m.
Preferably, the underground continuous wall is composed of a plurality of continuous walls of unit groove sections, and the length of each unit groove section of the underground continuous wall is 4-6 m.
Further, the underground diaphragm wall 210 is formed by a permeability coefficient of less than 10-6The material of cm/s is cast in situ.
Preferably, the underground diaphragm wall 210 is cast in situ by plastic concrete or impervious concrete.
In this embodiment, the underground diaphragm wall 210 is cast in place of impervious concrete.
Preferably, the permeability coefficient of the contaminated site vertical barrier system 200 is 10 or less-7cm/s。
Further, the high-pressure jet grouting occlusive pile 220 is formed by mutually occluding 2 to 4 jet grouting piles, and the diameter of the pile is 0.5 to 1.2 m.
Specifically, the contaminated site vertical barrier system 200 enters the stroke formation at a depth of 0.5m or more.
Specifically, the overall height of the contaminated site vertical barrier system 200 is 7m to 10 m.
A method for constructing a vertical barrier system 200 for a contaminated site, as shown in fig. 3, comprising the steps of:
s1, determining the pollution range of the site: and determining the pollution range of the site according to the site investigation and evaluation result.
S2, arranging a guide wall 100: according to the site utilization status and the geological conditions, the guide wall 100 is built at a proper position outside the range of the polluted site 500.
S3, grooving construction: and determining the position of the water-resisting layer top plate 300 according to the site geological conditions, and calculating the grooving depth of the vertical blocking system 200 of the polluted site.
S4, building underground continuous walls 210: and sequentially pouring impervious materials at the hole sections after grooving.
S5, constructing the high-pressure jet grouting secant pile: and high-pressure jet grouting occlusive piles 220 are arranged at the inner sides of the joints of the adjacent underground continuous walls 210 and the internal corners of the inflection points.
Further, the setting position of the guide wall 100 is 1m-10m outside the range of the polluted site 500.
Further, the trenching depth of the contaminated site vertical barrier system 200 is 0.5m to 3m below the water-barrier roof 300 below the contaminated area.
Preferably, the guide wall 100 is an inverted L-shaped guide wall.
Specifically, the high-pressure jet grouting secant pile 220 is constructed by a triple pipe method, the volume ratio of water to cement is 1:1, the pile diameter is 0.5m, and the inter-pile meshing is 0.15 m. The high-pressure rotary spraying secant pile 220 constructed by the triple pipe method can effectively fill and plug gaps and corners between the adjacent underground continuous walls 210, and the high-pressure rotary spraying secant pile 220 and the walls of the underground continuous walls 210 are connected to form a solidification body with controllable properties, so that the joints and corners of the adjacent underground continuous walls 210 can be effectively reinforced, and the effect of enhancing seepage prevention is achieved.
Specifically, according to the field utilization status and the terrain, a central line of the underground continuous wall 210 is determined by a measuring instrument, and the underground continuous wall 210 and the high-pressure jet grouting secant pile 220 are arranged to form the vertical blocking system 200 in the form of a waterproof curtain.
According to the invention, by arranging the vertical blocking system 200 for the polluted site, on one hand, the smooth development of the treatment and remediation work of the polluted soil and underground water in the site is ensured, the treatment and remediation effect is ensured to reach the standard, on the other hand, the polluted soil and underground water outside the site are prevented from diffusing into the site, and the safe and environment-friendly operation of facilities in the site is ensured.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (10)
1. The vertical blocking system for the polluted site is characterized by comprising an underground continuous wall, wherein the underground continuous wall is vertically arranged around the polluted site.
2. The vertical blocking system for the polluted site as claimed in claim 1, further comprising a plurality of high-pressure jet grouting secant piles, wherein each high-pressure jet grouting secant pile is distributed at the inner side of the joint of the adjacent underground continuous walls and at the corner internal corner.
3. The contaminated site vertical barrier system of claim 1, wherein the underground continuous wall has a thickness of 0.6m to 1.5 m.
4. The contaminated site vertical barrier system according to claim 1, wherein said underground continuous wall is composed of a continuous wall of a plurality of unit cell segments, and said unit cell segments of said underground continuous wall have a length of 4m to 6 m.
5. The vertical barrier system for a contaminated site according to claim 1, wherein the underground continuous wall is formed by a permeability coefficient of less than 10-6The material of cm/s is cast in situ.
6. The contaminated site vertical barrier system of claim 5, wherein the underground continuous wall is cast in place of plastic concrete or impervious concrete.
7. The vertical blocking system for the polluted site as claimed in claim 2, wherein the high-pressure jet grouting occlusive pile is formed by mutually occluding 2 to 4 jet grouting piles, and the diameter of the jet grouting pile is 0.5m to 1.2 m.
8. A construction method of a vertical blocking system of a polluted site is characterized by comprising the following steps:
s1, determining the pollution range of the site: determining a site pollution range according to a site investigation evaluation result;
s2, arranging a guide wall: constructing a guide wall outside the range of the polluted site according to the site utilization status and the geological condition;
s3, grooving construction: determining the position of a top plate of a water-resisting layer according to the geological conditions of the site, and calculating the grooving depth of the vertical blocking system of the polluted site;
s4, building underground continuous walls: sequentially pouring impervious materials in the slotted hole sections;
s5, constructing the high-pressure jet grouting secant pile: and occlusion jet grouting piles are arranged at the inner sides of the joints of the adjacent underground continuous walls and the internal corners of the inflection points.
9. The method for constructing a vertical barrier system on a contaminated site according to claim 8, wherein the guide wall is disposed at a position 1m to 10m outside the contaminated site.
10. The method of constructing a contaminated site vertical barrier system according to claim 8, wherein the depth of the trough of the contaminated site vertical barrier system is 0.5m to 3m below the top deck of the water barrier below the contaminated area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010838014.6A CN111945791A (en) | 2020-08-19 | 2020-08-19 | Vertical separation system for polluted site and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010838014.6A CN111945791A (en) | 2020-08-19 | 2020-08-19 | Vertical separation system for polluted site and construction method |
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| CN111945791A true CN111945791A (en) | 2020-11-17 |
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| CN202010838014.6A Pending CN111945791A (en) | 2020-08-19 | 2020-08-19 | Vertical separation system for polluted site and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338349A (en) * | 2021-06-09 | 2021-09-03 | 中冶节能环保有限责任公司 | Novel steel slag landfill vertical separation system and implementation method |
| CN115094956A (en) * | 2022-07-26 | 2022-09-23 | 江苏交水建智能装备研究院有限公司 | Device and method for in-situ isolation treatment of local area polluted soil |
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| CN115094956A (en) * | 2022-07-26 | 2022-09-23 | 江苏交水建智能装备研究院有限公司 | Device and method for in-situ isolation treatment of local area polluted soil |
| CN115094956B (en) * | 2022-07-26 | 2024-05-28 | 江苏交水建智能装备研究院有限公司 | Device and method for in-situ isolation treatment of polluted soil in local area |
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