CN116770901A - Double-layer vertical partition wall structure of polluted site and active regulation and control method - Google Patents
Double-layer vertical partition wall structure of polluted site and active regulation and control method Download PDFInfo
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Abstract
A polluted site double-layer vertical partition wall structure and an active regulation method, step 1, site planning pretreatment; step 2, establishing a double-layer partition wall structure; and 3, establishing an active regulation and control system for the water level of the polluted site, wherein the active regulation and control system for the water level of the polluted site comprises a differential water level sensor, a water supplementing system and a computer control terminal, monitoring the water level of a polluted site and a buffering area, calculating the water level difference between the differential water level sensor and the buffering area by matching with the differential water level sensor, and controlling the water supplementing system to supplement water into the buffering area by the computer control terminal when the water level difference is greater than a preset threshold value until the underground water level of the buffering area is leveled with the water level of the polluted site. The invention separates the convection, diffusion and dispersion mechanisms of pollutant migration through the double-layer baffle wall structure and the water level regulating and controlling system, obviously reduces the convection and dispersion actions of the polluted site to the baffle wall buffer area, can greatly reduce the pollutant concentration of the buffer area and the outside of the polluted site, and further obviously improves the service life of the baffle wall of the polluted site.
Description
Technical Field
The invention relates to the technical field of environmental geotechnical engineering, in particular to a double-layer vertical partition wall structure of a polluted site and a regulating and controlling method.
Background
Under the great protection policy of the Yangtze river, chemical enterprises are carried out continuously along the coast at the middle and downstream of the Yangtze river, and the method is shut down and a large amount of heavy metal pollution sites are left. Soil and water pollution generally exists in the legacy sites, and pollutants are flushed along with rainfall and diffused into river channel water bodies by groundwater seepage, so that water environment is seriously threatened. The vertical baffle wall is an economic and effective pollution site risk management engineering measure. The barrier wall is mainly applied to dam or reservoir seepage prevention engineering in early stage, and along with the technical development, the barrier wall is increasingly applied to pollution control engineering, such as sewage or sewer pollution control, acid mine and chemical waste control and petroleum pollutant control. According to different wall materials and structural forms, the vertical barrier wall can be divided into a soil-bentonite slurry barrier wall, a plastic concrete barrier wall, a cement system barrier wall, a geomembrane composite barrier wall, a steel sheet pile barrier wall, a grouting curtain, a high-pressure jet grouting wall and the like.
As disclosed in Chinese patent publication, "a mud wall for blocking a contaminated site and a method for controlling and treating blocking a contaminated site, CN201911303807.1" is adopted to block the periphery of a contaminant, the compressive strength of the mud wall can reach 0.8-2.5MPa, and the permeability coefficient is (2.2-4.5) multiplied by 10 -7 cm/s, can prevent pollutants, particularly heavy metals, from penetrating, and has good barrier effect on the pollutants;
the scheme is that the blocking module can be assembled in a modularized mode, and the blocking module and the sealing module are processed in batches by a factory, so that the blocking device is convenient to transport, and is directly used in a field needing to be subjected to pollution control, so that the pollution of the pollution field is controlled, and the pollution of the pollution field is reduced; the blocking module and the sealing module are made of high-strength plastic with extremely high stability, so that the blocking performance of the blocking layer can be ensured for a long time;
as disclosed in Chinese patent, the scheme mainly comprises an underground continuous wall and a high-pressure jet grouting occluding pile to jointly form a barrier system meeting the anti-seepage requirement, and the method is wide in application geological conditions;
according to the scheme, underground water entering an in-situ reaction zone is treated in situ through an implementation well, pollutants entering and passing through the zone along with underground water flow are removed, a way of preventing pollution from flowing and diffusing through the underground water is blocked, the quality of soil and groundwater environment at the downstream or peripheral zone of the pollution zone is protected, and the risk management and control of the pollution zone are realized.
The cement series partition wall is characterized in that cement paste and a raw soil layer are forcedly stirred and solidified to form cement piles, the piles are lapped to form a continuous wall body with thickness and impermeability meeting requirements, the cement series partition wall has the characteristics of strong stratum adaptability, good impermeability, low price and the like, has certain advantages in technical and economical aspects, is more suitable for national conditions, is often used as a preferred scheme in partition wall engineering of a clay covering layer site at the middle and lower reaches of a Yangtze river of China, and is mainly in a single-layer structure. The prior single-layer cemented soil partition wall faces the following problems: when the water level in the polluted site is obviously higher than that outside the polluted site (in the dry season), the pollutants have combined actions of convection, molecular diffusion, mechanical diffusion and the like on the barrier wall, the barrier effect of the single-layer barrier wall is poor, and the pollution service life of the single-layer barrier wall is greatly reduced. Therefore, a new technology is needed to be proposed, which can significantly improve the barrier effect and the long-term service life of the barrier wall.
Disclosure of Invention
The invention aims to provide a double-layer vertical barrier wall structure and an active regulation and control system for a polluted site, which can effectively separate the convection and diffusion effects of pollutants by arranging a double-layer vertical barrier wall and a buffer system under the condition of reasonably controlling a water head, and can greatly improve the breakdown time and the service life of the pollution barrier system.
The aim of the invention can be achieved by the following technical scheme:
the double-layer vertical blocking method for the polluted site specifically comprises the following steps:
step 1, field planning pretreatment: firstly, site investigation is carried out, site pollution source properties, site pollution degree and site hydrogeological conditions are known, underground water and soil are detected, pollutant distribution conditions and concentration levels are determined, and a pollution site protection area is defined;
step 2, building a double-layer partition wall structure: forming a buffer zone by providing an inner vertical barrier wall and an outer vertical barrier wall around the contaminated site protection area, respectively;
and 3, establishing an active regulation and control system for the water level of the polluted site, wherein the active regulation and control system comprises a differential water level sensor, a water supplementing system and a computer control terminal, monitoring the water level of the polluted site and a buffer area, calculating the water level difference between the differential water level sensor and the buffer area by matching with the differential water level sensor, and controlling the water supplementing system to supplement water into the buffer area by the computer control terminal when the water level difference is greater than a preset threshold value until the underground water level of the buffer area is leveled with the water level of the polluted site.
Preferably, in the double-layered barrier wall structure of step 2, the inner vertical barrier wall and the outer vertical barrier wall are both cement-based barrier walls; the thickness of the inner barrier wall is 0.8-1.2m, the thickness of the outer barrier wall is 0.6m, and the distance between the two barrier walls is 0.8-1m; the wall material is bentonite-cement material, wherein the cement mixing ratio is 10% -20%, and the bentonite mixing ratio is not less than 5%.
Preferably, the active regulation and control system in the step 3 further comprises a water level sensor which is pre-buried in the buffer zone and the pollution site and is used for monitoring the groundwater level, the water level sensor is in communication connection with a differential water level sensor, and the differential water level sensor is connected with a computer control terminal.
Preferably, the water replenishing system comprises a plurality of water replenishing wells uniformly arranged in the buffer area, wherein the water replenishing wells are connected with the water pump room and are provided with electric control valves, and the electric control valves are in communication connection with the computer control terminal;
and the computer control terminal is respectively in communication connection with the water pump room, the differential water level sensor and the electric control valve.
Preferably, the depth of the water supplementing well is the same as that of the vertical separating wall, the adjacent distance of the water supplementing well is 5-10m, a flower pipe with a hole on the side wall is adopted, and the diameter of the hole on the flower pipe is 5mm.
Preferably, the water supplementing system further comprises a pipe network, wherein the pipe network is paved inside the buffer zone and is connected with the water supplementing well.
The invention has the beneficial effects that:
1. according to the invention, the double-layer barrier wall and the buffer area are arranged around the pollution site, and the water level of the buffer area is regulated and controlled to be basically consistent with that in the pollution site, so that the pollutant migration at two sides of the inner wall (the pollution site and the buffer area) has only molecular diffusion effect, the convection and diffusion effect of the pollutant are obviously reduced, the pollutant concentration in the buffer area is greatly reduced, and finally, the pollutant concentration outside the pollution site is reduced, and therefore, the service life of the barrier wall system can be obviously prolonged.
2. Compared with other partition wall forms, the invention has the advantages of lower cost, relatively convenient construction and certain technical and economical efficiency, and the invention provides the wall material which comprehensively adopts bentonite and cement material, wherein the bentonite is doped with not less than 5 percent, so that the permeability of the partition wall can be effectively reduced; 10 to 20 percent of cement series material is doped, so that the durability of the barrier wall material can be greatly improved;
3. the invention adopts a water level intelligent sensing and active regulating system, one end of a computer control terminal is connected with a differential water level sensor, the water head difference between a buffer zone and a polluted site is automatically sensed, the other end of the computer control terminal is connected with a water pump house, an electric control valve and a water supplementing well, and when the water head difference is larger than a preset threshold value, the computer system actively controls water supplementing to the buffer zone.
In summary, the invention obviously separates the pollutant migration process through the double-layer baffle wall structure and the water level regulating and controlling system, the buffer area and the polluted site (at two sides of the inner wall) are mainly the molecular diffusion effect of pollutants, and the buffer area and the polluted site (at two sides of the outer wall) are mainly the convection and diffusion effects, so that the separation of the convection, diffusion and diffusion mechanisms of the pollutants in the baffle wall system is realized, the concentration of the pollutants in the buffer area and the polluted site can be greatly reduced, the service life of the baffle wall is obviously prolonged, and the invention is particularly suitable for the baffle wall engineering of the polluted site along the river basin with high pollution concentration and large water head height difference.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow diagram of a double-layer vertical barrier wall structure and an active regulation method of a contaminated site;
FIG. 2 is a plan view of a double-layered barrier wall structure and active control system for a contaminated site;
FIG. 3 is a cross-sectional view of the view A-A of FIG. 2 in accordance with the present invention;
FIG. 4 is a schematic diagram of a dual layer vertical barrier control system for a contaminated site in accordance with the present invention;
FIG. 5 is a schematic diagram of model A of example 2 of the present invention;
FIG. 6 is a schematic diagram of model B of example 2 of the present invention;
FIG. 7 is a graph showing the results of calculation of the relationship between the concentration of contaminants and the migration distance in example 2 of the present invention.
Reference numerals:
1. an outer vertical barrier wall; 2. a buffer area; 3. an inner vertical barrier wall; 4. a contaminated site; 5. an electric control valve; 6. a computer control terminal; 7. a water pump house; 8. a differential sensor; 9. a buffer area water level gauge; 10. a contaminated site fluviograph; 11. a pipe network; 12. and (5) supplementing the water well.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
soil and water pollution are commonly present in a pollution site in a protection area, pollutants enter river water along with rainfall erosion and groundwater seepage diffusion, water environment is seriously threatened, meanwhile, due to hydrogeological conditions of the pollution site and the characteristics of the groundwater flow field of the pollution site, a single-layer vertical pollutant blocking wall technology of the known pollution site is used for blocking and isolating a pollution source by constructing a vertical blocking wall body which is made of materials with good seepage and pollution prevention performances around the site so as to achieve the effect of controlling the pollutant diffusion, but a blocking wall is used, water level difference is extremely easy to occur between the pollution site 4 and a peripheral isolation area, and once the water level of the pollution site 4 is larger than the water level outside the pollution site 4, the phenomenon of pollutant convection migration occurs between the pollution site 4 and the peripheral isolation area, and the speed of pollutant migration is greatly improved;
in order to solve the technical problems that the single-layer barrier wall has poor barrier effect and greatly reduces the service life of pollution due to the combined actions of convection, diffusion, mechanical diffusion and the like of pollutants under the action of a high water head difference, referring to fig. 1, the invention provides a double-layer vertical barrier wall structure for a polluted site and an active regulation method, which specifically comprise the following steps:
step 1: and (3) field planning pretreatment: firstly, site investigation and evaluation are carried out, and the nature of a pollution source, the pollution degree of the site and hydrogeological conditions are known; secondly, detecting underground water and soil, determining the distribution condition and concentration level of pollutants, and defining a protection area of a pollution site 4; finally, removing or rearranging underground facilities, removing or rearranging underground pipelines and other measures to avoid influencing the construction and performance of the barrier wall;
step 2, establishing a buffer area: forming a buffer zone 2 by providing an inner vertical barrier wall 3 and an outer vertical barrier wall 1 around a protection area of a contaminated site 4, respectively, that is, setting up the buffer zone 2 around the contaminated site 4 through the outer vertical barrier wall 1 and the inner vertical barrier wall 2; an inner vertical baffle wall 3 and an outer vertical baffle wall 1 are arranged, a buffer zone 2 is formed by the area between the inner and outer baffle walls, namely, a buffer zone is arranged between a pollution site 4 and a peripheral isolation area, the buffer zone further prevents pollutants from migrating to the isolation outer area, and the outer vertical baffle wall 1 prevents the water level of the buffer zone 2 from rapidly falling or rising;
under the condition of changeable external climate environment, the ground water level of the polluted site 4, the buffer zone 2 and the isolated outer area can fluctuate under the influence of climate conditions such as rainfall, high temperature and the like, seasonal variation and topography. For example, in the dry season along the Yangtze river, when the groundwater level in the buffer zone 2 is lower than the pollution site 4, the pollutant in the pollution site 4 can generate accelerated seepage under the action of the water head difference, so that the diffusion speed of the pollutant is accelerated;
step 3, water level regulation: a water supplementing well 12, a buffer zone water level meter 9 and a pollution site water level meter 10 are respectively arranged in the pollution site 4 and the buffer zone 2, and the data information of the underground water level in the buffer zone 2 and the pollution site 4 is collected in real time through the water level meter;
according to the data information, calculating the water head difference between the water level of the polluted site 4 and the water level in the buffer zone 2, and when the water head difference is larger than a preset threshold value, supplementing water to the buffer zone 2 through a water supplementing well 12, so as to eliminate the water head difference between the buffer zone 2 and the polluted site 4, thereby effectively preventing the convection and dispersion of pollutants; until the groundwater level of the buffer zone 2 is equal to the groundwater level of the protection zone;
essentially, the water level in the buffer zone 2 is regulated and controlled, namely, the water level of the buffer zone 2 is increased, and the consistency of the underground water level in the buffer zone 2 and the underground water level in the pollution site 4 is ensured, so that the pollutant migration at two sides of the inner vertical partition wall 3 only has a molecular diffusion effect, thereby indirectly and greatly reducing the pollutant concentration in the buffer zone 2 and finally reducing the pollutant concentration in the isolation zone; the process of pollutant migration is obviously separated through the inner vertical baffle wall 3, the outer vertical baffle wall 1 and the water supplementing well 12 matched with the water level in the real-time regulation buffer zone 2, and the molecular diffusion effect of pollutants mainly occurs between the water sources at the two sides of the inner vertical baffle wall 3 and the pollution sources in the water between the pollution site 4 and the buffer zone 2; between the buffer zone 2 and the isolated outer zone, the water source on both sides of the outer vertical barrier wall 1 and the source of pollution in the water, mainly occurs the convection and dispersion of the pollutants.
As an embodiment of the present invention, specifically, referring to fig. 2 and 3, the inner vertical barrier 3 and the outer vertical barrier 1 are shown, the thickness of the inner vertical barrier 3 is 0.8-1.2m, the thickness of the outer vertical barrier 1 is 0.6m, and the interval between the two layers of barriers is 0.8-1.0m; the wall material is bentonite-cement composite material, wherein the cement mixing ratio is between 10% and 20%, the bentonite mixing ratio is not lower than 5%, the cement is common building construction material, the bentonite is a better barrier material, and the two materials are nontoxic and harmless and can adsorb harmful substances, thereby belonging to environment-friendly materials.
As an embodiment of the present invention, referring to fig. 3 and 4 specifically, the water replenishment wells 12 are arranged at an adjacent interval of 5-10m according to the size of the buffer zone 2, it can be seen from the figure that the periphery of the polluted site 4 is respectively provided with the inner vertical barrier wall 3 and the outer vertical barrier wall 1 from inside to outside, and a buffer zone 2 is formed, and the specific number of the plurality of water replenishment wells 12 in the buffer zone 2 is selected according to the size of the buffer zone 2, so that the purpose is to ensure rapid water replenishment in the buffer zone 2, and indirectly form regulation and control of the groundwater level in the buffer zone 2.
As an embodiment of the present invention, a double-deck vertical barrier wall structure and a water level active control system for a contaminated site, including a computer control terminal 6 and a water pump room 7, further includes: an inner vertical baffle wall 3, a buffer zone 2, an outer vertical baffle wall 1 and a water supplementing system arranged in the buffer zone 2 are sequentially arranged on a polluted site 4 from inside to outside;
a pollution site water level meter 10 and a buffer zone water level meter 9 for monitoring the ground water level are arranged in the buffer zone 2 and the pollution site 4, the pollution site water level meter 10 and the buffer zone water level meter 9 are connected with a differential water level sensor 7, and the differential water level sensor 7 is connected with a computer control terminal 6;
the water supplementing system comprises a plurality of water supplementing wells 12, and when the water level in the polluted site 4 is greater than the water level in the buffer zone 2 and the water level difference between the two water levels is greater than a preset threshold value, the water supplementing wells 12 supplement water in the buffer zone 2;
the water supplementing system also comprises a pipe network 11, wherein the pipe network 11 is paved on the surface of the buffer zone 2 and is connected with a water supplementing well 12;
the water pump room 7 is connected with a water supplementing system through a pipeline, and a pipe network 11 is provided with a computer control terminal 6 and an electric control valve 5.
Through the technical scheme: under the influence of climate conditions such as rainfall, high temperature and the like and seasonal variation, the groundwater level can be fluctuant, and the pollutant in the polluted site 4 can generate accelerated seepage under the action of the water head difference, so that the diffusion speed of the pollutant is accelerated. In order to cope with such situations, the water level data of two points are monitored in real time by the water level gauges respectively arranged in the pollution site 4 and the buffer zone 2, the water level data information is transmitted to the computer control terminal 6, the computer control terminal 6 automatically calculates the water level difference between the two water level data and the water level data, when the water level in the buffer zone 2 is lower than the water level of the pollution site 4, the pollutant in the pollution site 4 can be understood to be seepage diffusion from the inside of the pollution site 4 to the outside of the pollution site under the action of the water level difference by the water level difference, when the water level of the pollution site 4 exceeds a certain limit value of the water level of the buffer zone 2, namely the water level difference delta h is greater than the threshold h, the electronic control valve 5 is controlled to be automatically opened by the computer control terminal 6, and seepage regulation is carried out on the water level data through the water supplementing well 12 arranged on the side wall of the buffer zone 2, so that the water level of the buffer zone 2 is equal to the water level of the pollution site 4, and then the water supplement can be stopped, and the seepage diffusion of the pollutant from the inside of the pollution site 4 to the outside of the pollution site under the action of the water level difference is prevented
Example 2:
in order to analyze the practical application effects of the double-layer vertical barrier wall and the active regulation device, adopting finite element coomsol software to carry out numerical simulation on the service performance of the barrier wall, wherein the thickness of the single-layer vertical barrier wall is 1m; the parameters of the double-layer vertical partition wall are that the thickness of the inner wall is 1m, the thickness of the outer wall is 0.6m, and the distance between the inner wall and the outer wall is 1m.
The site model selects a round site with the radius of 50m, wherein a round area with the middle part of 40m is a polluted site, and an external river is arranged outside 50 m.
In order to simplify the model, the soil layers of the polluted site and the isolated outer area are subjected to homogenization treatment, and the related parameters of the soil layers are shown in the following table and refer to the previous research results.
Boundary conditions selected by the model comprise a constant head, impermeability, axisymmetry, rainfall infiltration boundary and the like, wherein the rainfall infiltration intensity is 0.3mm/d, and in order to better embody the accuracy of experimental results, a technical scheme of the invention corresponding to the model A is respectively constructed, namely a double-layer vertical barrier wall and an active regulation and control system (shown in figure 5), and a single-layer barrier wall structure (shown in figure 6) corresponding to the model B in the prior art;
after the model and parameters are selected, computational analysis is performed using finite elements Comsol Multiphysics. And selecting a working condition of 50 years of migration for comparison analysis, wherein the migration of pollutants under the working condition can be approximated as a one-dimensional migration model, and converting a software calculation result into a correlation relation between the concentration of the pollutants and the migration distance.
As shown in fig. 7, the simulation result shows that the relative concentration C/c0=0.1 is used as the breakdown standard of the barrier wall, after 50 years of migration, only the inner wall part of the double-layer vertical barrier wall is broken down, the main pollutant diffusion is limited in the buffer zone, and the outward migration speed of the pollutant is greatly reduced with the assistance of the active regulation and control device;
correspondingly, when the pollution site 4 only has a single-layer vertical baffle wall, the pollutants directly migrate from the pollution area to the outer baffle area under the combined actions of convection, diffusion, mechanical diffusion and the like, the baffle wall obviously breaks down, the concentration of the local area is even up to 0.7mol/L, and the baffle wall is almost ineffective;
based on simulation results, the double-layer vertical barrier wall combined active regulation and control system exerts a better barrier effect than the single-layer vertical barrier wall, the water levels at the two sides of the inner barrier wall are basically kept consistent by using the active regulation and control device arranged in the buffer zone, so that pollutants are only transported under the diffusion effect of the inner barrier wall, the main pollutant diffusion is limited in the buffer zone, and the transportation of pollutants at the two sides of the inner barrier wall (the pollution site and the buffer zone) is only molecular diffusion effect, in addition, the transportation speed of the pollutants from the buffer zone to the isolation outer zone is greatly reduced due to the existence of the outer barrier wall, and the concentration of the pollutants outside the buffer zone and the pollution site (at the two sides of the outer wall) is greatly reduced due to the main convection and diffusion effect of the buffer zone, so that the service life of the barrier wall is greatly prolonged.
In summary, according to the barrier regulation system provided by the invention, when the water level outside the polluted site 4 is lowered, the water level of the buffer zone 2 is increased, the water heads in the buffer zone 2 and the polluted site 4 are ensured to be basically consistent, so that the pollutant migration at two sides of the inner vertical barrier wall 3 has only molecular diffusion effect, the pollutant concentration in the buffer zone 2 is greatly reduced, and finally the pollutant concentration outside the polluted site 4 is reduced, while under normal conditions, the buffer zone 2 and the polluted site 4 mainly have the molecular diffusion effect of the pollutant, and the buffer zone 2 and the isolated outer region mainly have the convection and diffusion effects, thereby separating the convection, diffusion and diffusion mechanisms of the pollutant in the isolated barrier, obviously prolonging the service life of the barrier wall, and being particularly suitable for the barrier wall engineering of the polluted site along the Yangtze river flow field with high pollution concentration and large water head height difference.
The foregoing is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar thereto, by those skilled in the art, without departing from the principles of the invention or beyond the scope of the appended claims.
Claims (7)
1. The double-layer vertical partition wall structure of the polluted site and the active regulation and control method are characterized by comprising the following steps:
step 1, field planning pretreatment: firstly, site investigation is carried out, site pollution source properties, site pollution degree and site hydrogeological conditions are known, underground water and soil are detected, pollutant distribution conditions and concentration levels are determined, and a pollution site protection area is defined;
step 2, building a double-layer partition wall structure: forming a buffer zone by providing an inner vertical barrier wall and an outer vertical barrier wall around the contaminated site protection area, respectively;
and 3, establishing an active regulation and control system for the water level of the polluted site, wherein the active regulation and control system comprises a differential water level sensor, a water supplementing system and a computer control terminal, monitoring the water level of the polluted site and a buffer area, calculating the water level difference between the differential water level sensor and the buffer area by matching with the differential water level sensor, and controlling the water supplementing system to supplement water into the buffer area by the computer control terminal when the water level difference is greater than a preset threshold value until the underground water level of the buffer area is leveled with the water level of the polluted site.
2. The structure and active control method of a double-layered vertical barrier wall structure for contaminated sites according to claim 1, wherein in said step 1, the underground pipelines and other measures are removed or rearranged for the underground facilities of the corresponding area based on the site survey results.
3. The double-layered vertical barrier wall structure and active control method for a contaminated site according to claim 1, wherein the double-layered barrier wall structure in step 2, wherein the inner vertical barrier wall and the outer vertical barrier wall are both cement-based barrier walls; the thickness of the inner barrier wall is 0.8-1.2m, the thickness of the outer barrier wall is 0.6m, and the distance between the two barrier walls is 0.8-1.0m; the wall material is bentonite-cement material, wherein the cement mixing ratio is 10% -20%, and the bentonite mixing ratio is not less than 5%.
4. The double-layer vertical partition wall structure of the polluted site and the active regulation and control method according to claim 1, wherein the active regulation and control system in the step 3 further comprises a water level sensor which is pre-buried in the buffer zone and the polluted site and is used for monitoring the ground water level, the water level sensor is in communication connection with a differential water level sensor, and the differential water level sensor is connected with a computer control terminal.
5. The double-layer vertical partition wall structure and the active regulation and control method for the polluted site according to claim 1, wherein the water supplementing system comprises a plurality of water supplementing wells uniformly arranged in a buffer zone, the water supplementing wells are connected with a water pump room and are provided with electric control valves, and the electric control valves are in communication connection with a computer control terminal;
and the computer control terminal is respectively in communication connection with the water pump room, the differential water level sensor and the electric control valve.
6. The double-layer vertical baffle wall structure and the active regulation and control method for the polluted site according to claim 5, wherein the depth of the water supplementing well is the same as that of the vertical baffle wall, the adjacent distance of the water supplementing well is 5-10m, a flower pipe with a hole on the side wall is adopted, and the diameter of the hole on the flower pipe is 5mm.
7. The structure and active control method of a vertical barrier wall of a contaminated site according to claim 5, wherein the water replenishing system further comprises a pipe network, which is laid inside the buffer zone and connected to the water replenishing well.
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