CN111872095B - Flexible bushing and pollution site monitoring method combined with flexible bushing - Google Patents

Flexible bushing and pollution site monitoring method combined with flexible bushing Download PDF

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CN111872095B
CN111872095B CN202010565316.0A CN202010565316A CN111872095B CN 111872095 B CN111872095 B CN 111872095B CN 202010565316 A CN202010565316 A CN 202010565316A CN 111872095 B CN111872095 B CN 111872095B
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flexible
site
monitoring
permeability coefficient
vertical barrier
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CN111872095A (en
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孙新坡
毕钰璋
宋静艳
郭毅
廖卫东
司马卫平
刘文方
陈艳丹
刘钰
丁泽浩
赵朴
韩昌霖
李佳欣
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Sichuan University of Science and Engineering
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Sichuan University of Science and Engineering
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/08—Reclamation of contaminated soil chemically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082—Investigating permeability by forcing a fluid through a sample
    • G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C2101/00—In situ
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment

Abstract

The invention provides a flexible bushing and a method for monitoring a pollution site by combining the flexible bushing, wherein the flexible bushing is arranged in a monitoring well, namely a water-tight cylindrical sleeve is arranged in the drilling space to seal a drilling hole, so that the permeability coefficient and the pollutant characteristics of a soil body in the pollution site are monitored; selecting a vertical barrier of a corresponding type according to a monitoring result, and treating a polluted site by adopting a vertical barrier technology; and during treatment, the repairing and blocking effects of the polluted site and the soil around the polluted site are monitored by continuously utilizing the flexible lining technology, and liquid medicine is injected for repairing according to actual needs. The invention can effectively monitor the pollutant characteristics of the polluted site through the flexible lining technology, and can observe the change of the pollutant concentration and the permeability coefficient in the soil body around the site in real time, thereby improving the remediation effect of the polluted site.

Description

Flexible bushing and pollution site monitoring method combined with flexible bushing
Technical Field
The invention belongs to the technical field of control and treatment of polluted sites, and relates to a flexible bushing and a method for monitoring a polluted site by combining the flexible bushing.
Background
With the progress of society and economy, industry and agriculture are continuously developed, and simultaneously, the problem of soil pollution caused by the development is more serious. Heavy metal pollution such as chromium, nickel and the like left in soil bodies after rainfall is carried out on waste gas generated in the industrial production process, and toxic and harmful substances such as polycyclic aromatic hydrocarbon, chlorohydrocarbon and the like left in the soil bodies due to the use of pesticides in the agricultural production process are all inevitable soil body problems existing at present. The diffusion and the migration of pollutants in the soil are relatively complex processes, including diffusion, convection, adsorption and the like, and are easily subjected to multi-field coupling of a chemical field and a temperature field. Therefore, the influence range of soil pollution on the space is large, chain reaction often occurs to various problems, and other ecological environments such as underground water, atmosphere and the like are destroyed, so that the method is essential for treating the soil pollution.
In the treatment of various polluted sites, in-situ remediation is the main means. And aiming at the characteristics of long in-situ repair period and high difficulty in thorough repair, the vertical isolation technology is provided as a risk management and control and repair means. In the vertical barrier construction process, because the cross flow of water in each deep soil layer, cross contamination is easy to occur in a contaminated site, and the problem of aggravation of the contamination degree is caused. In order to carry out sealing, a bentonite sealing method is generally adopted in early-stage monitoring to treat the drilled hole, but in reality, bentonite causes certain pollution to a site to be repaired.
Disclosure of Invention
The invention aims to provide a flexible bushing and a method for monitoring a polluted site by combining the flexible bushing, wherein the method combines a vertical barrier with a flexible bushing technology, avoids cross contamination, determines site hydrological characteristics and pollutant characteristics, and simultaneously ensures that trace pollutants are not leaked in the process of repairing the polluted site, thereby improving the repairing effect of the polluted site.
A specific technical scheme is adopted;
a flexible liner comprising a cylindrical sleeve of water impermeable flexible material, the cylindrical sleeve being disposed in the borehole to form a tight seal within the borehole; annular partition sections which are permeable to water at the outer side and sealed at the inner side are arranged on the outer wall of the cylindrical sleeve at intervals, and the partition sections are connected with a temporary storage area at the bottom of the cylindrical sleeve through hoses; the cylindrical sleeve is communicated with an aerodynamic device through an air duct; the temporary storage area is internally provided with a sampling tube for sampling the temporary storage area.
The invention applies a new underground water sampling technology, namely a flexible lining technology, to the construction process of a vertical barrier. The permeability coefficient and pollutant characteristics of the soil body of the polluted site can be effectively checked by adopting the flexible lining technology, and cross contamination and trace pollutant leakage are prevented. Set up the outside at a distance of every interval in cylindrical sleeve and pass through water and inboard sealed cyclic annular septal section, the groundwater that awaits measuring in the contaminated site during the sample flows into the septal section, gets into the temporary storage area of cylindrical sleeve bottom through the hose in the septal section, has two pipes in the temporary storage area namely air duct and sampling tube, through atmospheric pressure principle and decurrent check valve, in the middle of the sampling bottle with groundwater sample introduction ground. When the polluted site is monitored, the flexible lining is arranged around according to the site information in the early stage, and the permeability coefficient and the pollutant characteristics of the site soil body are accurately measured. And (4) formulating a specific construction scheme combining the vertical barrier, the active PRB reaction wall and the aeration method according to the obtained monitoring result, and simultaneously continuously arranging a flexible lining on the outer side. And monitoring the concentration of pollutants in the surrounding land in the construction process, and judging whether the pollutants are leaked or the vertical barrier is broken down. The data measured by the flexible bushing technology is used as the basis before construction and the real-time monitoring result during construction.
To this end, a method of monitoring a contaminated site incorporating flexible liner technology is proposed. The flexible lining technology is adopted in construction, so that a drill hole can be temporarily sealed, the falling speed of the downwards expanded lining from a hole can be monitored, and the permeability coefficient (rock stratum is the permeability coefficient, and soil layer is the hydraulic conductivity coefficient) of a soil layer of a polluted site can be calculated by using the obtained lining deceleration data and the pressure gauge reading. In addition, underground water obtained by sampling the flexible bushing technology is analyzed to obtain corresponding pollutant characteristics, and the type of the vertical barrier suitable for a target site can be determined according to the results, so that a better repairing effect is achieved. The specific technical scheme is as follows:
a pollution site monitoring method combining a flexible lining technology comprises the following steps:
the first step is as follows: arranging a flexible lining in the monitoring well at the periphery of the pollution site according to the distribution condition of pollution sources and the water flow direction of underground water; calculating the permeability coefficient K value of the water seepage area of the polluted site by using the monitoring data of the flexible lining, wherein the rock stratum is the water permeability coefficient, and the soil layer is the hydraulic conductivity coefficient; sampling and collecting NAPL (non-aqueous phase liquid phase) samples, and analyzing the pollutant types of the polluted site;
the second step: determining the type of the corresponding vertical barrier according to the result obtained by the monitoring in the first step and the permeability coefficient K value, the pollutant types and the distribution;
the third step: monitoring by using the flexible lining while constructing the vertical barrier, and analyzing whether the permeability coefficient change of the soil body around the polluted site and the concentration and the type of pollutants contained in the soil body change; and injecting corresponding liquid medicine into the flexible lining according to actual needs to repair the vertical barrier until the construction of the vertical barrier is finished.
During construction, a flexible lining is arranged in an original design monitoring point, a monitoring instrument and a sensor are placed in the flexible lining, soil conditions around a polluted site are monitored in real time, the operation condition of vertical separation is analyzed, whether the local breakdown of the separation occurs or not is judged, and if pollutants are found, a medicament is injected into the flexible lining through a sleeve to repair the pollutants.
And further, calculating to obtain a permeability coefficient K value according to the descending rate of the flexible lining and the reading of the pressure gauge.
In the treatment process of the polluted site, in order to achieve a better treatment effect, the vertical barrier technology is often used in combination with the technologies such as an active PRB reaction wall and an aeration method. How layout and design are performed is a key point in the process of using a plurality of repair technologies in combination. The invention can identify the preferential water flow area by utilizing the hydraulic conductivity coefficient measured by the flexible lining technology, and can obtain the hydrogeological characteristics of the polluted area by matching with the hydraulic measurement result of the barrier. Meanwhile, the pollutant characteristics can be obtained by analyzing the groundwater sample of the pollution area obtained by sampling. The construction means of the polluted site can be designed and distributed more reasonably by combining the obtained information, and a better treatment effect is achieved. In addition, monitoring is carried out through monitoring facilities and corresponding sensor in flexible bush in the work progress, whether take place that the pollutant trace leaks or the divider wall punctures, can carry the medicine through the sleeve to the soil layer when necessary, repairs defective protective screen.
Compared with a pollution site monitoring method which independently uses a vertical barrier, an aeration method and an active PRB reaction wall and combines a flexible lining technology in the repairing process, the method can effectively observe the characteristics of underground water and pollutants and can know the underground crack distribution condition. These factors may lead to a reduction in the effectiveness of the contaminant treatment when the vertical barrier is constructed. In addition, the underground crack and the underground water distribution condition are known, and the selection of proper construction engineering machinery is facilitated. In a word, in the process of repairing the polluted site by the vertical barrier, the polluted site is monitored by combining the flexible lining technology, and compared with a common vertical barrier construction method, the method has unique advantages and innovation points, and is a reliable method for improving the repairing effect of the polluted site.
In conclusion, the invention has the following beneficial effects: the flexible bushing is a feasible technology for realizing rapid sealing of the drilled hole, the construction of the vertical barrier is combined with the flexible bushing technology, so that cross contamination in the construction process is effectively prevented, the permeability coefficient and the pollutant characteristics of a soil body of a contaminated site can be provided, and secondary pollution generated in the construction process is prevented.
Drawings
FIG. 1 is a schematic view of a flexible bushing according to the present invention;
FIG. 2 is a diagram showing the location arrangement of monitoring points in a contaminated site according to an embodiment;
FIG. 3 is a diagram of components of an example analysis profiling system for detecting a water layer;
FIG. 4 is a graph of liner deceleration assumed by the embodiment;
FIG. 5 is a schematic view of the construction of the embodiment.
Detailed Description
The embodiments of the present invention will be described with reference to the accompanying examples.
As shown in fig. 1, the flexible liner comprises a cylindrical sleeve 5 made of a water-impermeable flexible material, the cylindrical sleeve 5 is arranged in the drilling space, and a tight sealing layer is formed in the drilling space; annular partition sections which are permeable to water on the outer side and sealed on the inner side are arranged on the outer wall of the cylindrical sleeve 5 at intervals, and the partition sections are connected with the temporary storage area 3 at the bottom of the cylindrical sleeve 5 through hoses; the cylindrical sleeve 5 is communicated with the aerodynamic device 4 through the air duct 1; a sampling tube 2 is arranged in the temporary storage area 3 for sampling the temporary storage area 3.
The arrangement position of the flexible lining is determined according to the early-stage survey data of the polluted site, the arrangement density of the flexible lining is increased in the area with serious pollution, and as shown in figure 2, a plurality of technical monitoring point positions 6 of the flexible lining are arranged around a polluted land 7 in the figure. Groundwater sampling and analysis are performed according to the principle of the flexible lining technology.
The falling speed of the liner in the hole is measured by a speed measuring device in the flexible liner, and the analysis and analysis system component diagram of the water layer is detected as shown in figure 3. The speed measuring device comprises a speed measuring device 8, a water injection pipe 9, a pressure gauge 10 and a sensor 11, and the device is put down through an inwards-turned lining winch 12.
And (4) calculating the permeability coefficient K value (rock stratum is the permeability coefficient, and soil stratum is the hydraulic conductivity coefficient) of the water seepage area according to the liner deceleration data, namely the hypothetical liner deceleration curve chart shown in the figure 4 and the pressure gauge reading P.
Figure BDA0002547432120000041
In the formula: k is the permeability coefficient, m/s; k is permeability, D,1D =1m 2 (ii) a ρ is the fluid density, N · s 2 /m 4 (ii) a g is the acceleration of gravity, m/s 2 (ii) a Mu is dynamic viscosity, N.s/m 2 (ii) a Eta is the kinematic viscosity of the mixture,
Figure BDA0002547432120000042
Figure BDA0002547432120000043
wherein Q is the seepage flow, m 3 S; k is permeability, D,1D =1m 2 (ii) a A is the cross-sectional area of the hole, m 2 (ii) a Δ P is the pressure differential, i.e., pressure gauge reading, pa; μ is the hydrodynamic viscosity, pa.s, i.e. N.s/m 2 (ii) a Δ L is the percolation length, m.
ΔL＝L-L 1 (3)
Wherein, delta L is seepage length m; l is the total length of the drill hole, m; l is 1 Length of casing run, m.
Q＝v·A (4)
Wherein Q is the seepage flow, m 3 S; v is the liner lowering speed, i.e. velometer reading, m/s; a is the cross-sectional area of the hole, m 2 。
And (4) acquiring the hydrogeological characteristics of the polluted site according to the calculated permeability coefficient K of the permeable area, and analyzing the underground water sample to obtain the characteristics of the pollutants 15 in the area to be treated. And determining a specific construction scheme of the vertical barrier 14 by combining the obtained information, determining whether construction is performed by combining technologies such as an active PRB reaction wall 13 and the like, and arranging a flexible lining at the edge of the polluted site, as shown in FIG. 5.
In the construction process of the vertical barrier, due to artificial or natural factors, a small part of the barrier is likely to be defective, so that the leakage phenomenon of trace pollutants is caused, monitoring equipment or sensors are continuously arranged in the flexible bushing to monitor the concentration of the pollutants in the surrounding soil body during construction, and whether leakage occurs is judged.
The flexible lining technology is applied to the construction of the vertical barrier, so that the construction method is more reasonable, and the restoration effect of the polluted site is improved.

Claims (3)

1. A pollution site monitoring method combining a flexible lining technology is characterized in that a flexible lining is adopted, the flexible lining comprises a cylindrical sleeve made of waterproof flexible materials, the cylindrical sleeve is arranged in a drill hole, and a tight sealing layer is formed in the drill hole; annular partition sections which are permeable to water at the outer side and sealed at the inner side are arranged on the outer wall of the cylindrical sleeve at intervals, and the partition sections are connected with a temporary storage area at the bottom of the cylindrical sleeve through hoses; the cylindrical sleeve is communicated with an aerodynamic device through an air duct; a sampling tube is arranged in the temporary storage area for sampling the temporary storage area;
the method comprises the following steps:
the first step is as follows: arranging the flexible bushing in the monitoring well at the periphery of the pollution site according to the distribution condition of pollution sources and the water flow direction of underground water; calculating the permeability coefficient K value of the water seepage area of the polluted site by using the monitoring data of the flexible lining, wherein the rock stratum is the water permeability coefficient, and the soil layer is the hydraulic conductivity coefficient; sampling and collecting NAPL (non-aqueous phase liquid phase) samples, and analyzing the pollutant types of the polluted site;
the second step: determining the corresponding vertical barrier type according to the result obtained by the monitoring in the first step and the permeability coefficient K value, the pollutant types and the distribution;
the third step: monitoring by using the flexible lining while constructing the vertical barrier, and analyzing the change of the permeability coefficient of the soil around the polluted site and the change of the concentration and the type of pollutants contained in the soil; and injecting corresponding liquid medicine into the flexible lining according to actual needs to repair the vertical barrier until the construction of the vertical barrier is finished.
2. The method for monitoring the pollution site by combining the flexible bushing technology as claimed in claim 1, wherein the flexible bushing is arranged in an originally designed monitoring point during construction, a monitoring instrument and a sensor are placed in the flexible bushing, the soil condition around the pollution site is monitored in real time, the vertical barrier operation condition is analyzed, whether barrier local breakdown occurs or not is judged, and if pollutants are found, a medicament is injected into the flexible bushing for repairing.
3. The method as claimed in claim 1, wherein K is a permeability coefficient calculated from the rate of descent of the flexible liner and the pressure gauge reading.
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CN112814042B (en) * 2020-12-31 2021-12-31 山西大学 Flexible waterproof curtain capable of quickly separating diffusion of site polluted underground water
CN114888066A (en) * 2021-04-23 2022-08-12 四川轻化工大学 Flexible lining method and method for treating, monitoring and treating polluted site by using same
CN114544913B (en) * 2022-02-23 2024-04-09 沈阳建筑大学 Soil investigation encryption sampling distribution optimization method
CN115508263B (en) * 2022-08-17 2023-07-21 中国地质大学（北京） Method, device, equipment and medium for measuring permeability coefficient of aquifer in polluted site

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