A vertical isolation barrier design method considering differentiated thickness
By calculating the theoretical barrier thickness of each soil layer in the polluted site and optimizing the isolation barrier design, the problems of material waste and carbon emissions in the prior art are solved, and the effect of reducing material usage and construction costs is achieved.
Patent Information
- Application Number
- CN202411886969.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-04-04
AI Technical Summary
The prior art adopts an indiscriminate thickness method when designing vertical isolation barriers, resulting in material waste and increased carbon emissions, which cannot effectively delay pollutants entering the barrier and migrate outside the isolation range.
By calculating the soil layer parameters of each soil layer in the contaminated site, the theoretical barrier thickness of the isolation barrier required for each soil layer is calculated, and the isolation barrier design results with the minimum total construction usage are determined based on these thicknesses. The design results include the thickness and depth of the foundation isolation layer and the reinforcement barrier layer.
On the basis of meeting the requirements of isolation barriers, the material usage and construction costs are greatly reduced, and pollutants enter the barrier and migrate outside the isolation range are achieved to achieve the effect of energy conservation and emission reduction.
Smart Images
Figure CN119761033A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of environmental restoration, and in particular to a vertical isolation barrier design method taking differentiated thickness into consideration. Background Art
[0002] Human activities have caused a lot of groundwater and soil environmental pollution, mainly including inorganic pollutants and organic pollutants. These pollutants enter the human body directly or indirectly, causing great harm to life and health.
[0003] With the continuous advancement of soil and groundwater pollution remediation in recent years, the remediation of more and more high-risk contaminated plots has brought huge challenges to the industry. High-risk contaminated plots usually have the characteristics of high pollution load, high environmental risk, high difficulty in remediation, and high cost of remediation. Therefore, setting up isolation barriers on the periphery of the contaminated area to implement risk control has become an important option. The basic principle is to set up vertical or horizontal isolation barriers on the periphery of the pollution source to block the migration path of pollutants and isolate the polluted medium from the surrounding environment to achieve the purpose of controlling pollution risks. However, it should be noted that once pollutants enter the isolation barrier, they will gradually migrate outward due to convection, adsorption, diffusion and other effects. Under the condition of continuous release from the pollution source and sufficient migration time, they will eventually penetrate the isolation barrier. If necessary measures are taken to delay the time for pollutants to enter the barrier body and migrate outside the isolation range, the pollution isolation capacity and service life of the vertical isolation barrier can be improved.
[0004] In recent years, the application of isolation barriers in contaminated sites has increased year by year. In actual application, the design method of no difference in thickness is generally adopted. Although this method can simplify the construction process, it may lead to waste of materials and cause additional increase in carbon emissions. Summary of the invention
[0005] The purpose of the present invention is to provide a vertical isolation barrier design method that takes into account differentiated thicknesses based on the above-mentioned deficiencies in the prior art. By calculating the total construction usage, the design result of the isolation barrier with the minimum total construction usage is selected. The isolation barrier consists of a basic isolation wall plus a local reinforced barrier wall. On the basis of meeting the requirements of the isolation barrier, it can greatly reduce material usage and construction costs, thereby achieving the effect of energy conservation and emission reduction.
[0006] The purpose of the present invention is achieved by the following technical solutions:
[0007] A method for designing a vertical isolation barrier considering differentiated thicknesses, the method comprising the following steps:
[0008] Divide the contaminated site into several soil layers vertically according to the pollution situation and stratum stratification;
[0009] Obtaining soil layer parameters of each soil layer, wherein the soil layer parameters include the maximum concentration of pollution sources in the soil layer, groundwater flow velocity of the soil layer, soil layer pollutant diffusion coefficient and soil layer pollution retardation factor;
[0010] Calculating the theoretical barrier thickness of the isolation barrier required for each soil layer according to the soil layer parameters of each soil layer;
[0011] Based on the theoretical barrier thickness of the isolation barrier required for each of the soil layers, the minimum total construction workload of the isolation barrier required for the contaminated site and the design results of the actual isolation barrier under the minimum total construction workload are determined, wherein the design results include the thickness of the vertically arranged base isolation layer, the thickness and depth of the reinforced barrier layer located outside the base isolation layer, and the depth of the base isolation layer is the sum of the thicknesses of all the soil layers.
[0012] Optionally, the step of calculating the theoretical barrier thickness of the isolation barrier required for each soil layer according to the soil layer parameters of each soil layer includes:
[0013] Substitute the soil layer parameters of each soil layer into the formula Calculate in order to obtain the theoretical barrier thickness of the isolation barrier required for each soil layer;
[0014] Wherein, H is the theoretical barrier thickness of the isolation barrier required by the soil layer, in meters; t is the service life of the isolation barrier, in years; D h is the diffusion coefficient of the pollutant, in m 2 / year; R d is the soil pollution barrier factor, dimensionless; C w is the initial concentration of pollutants in the contaminated site, in mg / L; v is the groundwater flow rate, in cm / s; C is the real-time concentration of pollutants in the contaminated site, in mg / L, erfc is the complementary error function, and exp is the natural exponential function.
[0015] Optionally, the step of determining the minimum total construction amount of the isolation barrier required for the contaminated site according to the theoretical barrier thickness of the isolation barrier required for each soil layer, and the design result of the actual isolation barrier under the minimum total construction amount includes:
[0016] The total construction amount of the isolation barrier required for the contaminated site is calculated by taking the theoretical barrier thickness of the isolation barrier required for each soil layer as the thickness of the basic isolation layer, and taking the difference between the maximum value of the theoretical barrier thickness of the isolation barrier required for each soil layer and the thickness of the basic isolation layer as the thickness of the reinforced barrier layer;
[0017] The thickness of the base isolation layer when the total construction amount of the isolation barrier required for the contaminated site is the minimum, the thickness of the reinforced barrier layer, and the thickness of the soil layer whose theoretical barrier thickness is greater than the base isolation layer are taken as the design results of the actual isolation barrier.
[0018] Optionally, the step of calculating the total construction amount of the isolation barrier required for the contaminated site by taking the theoretical barrier thickness of the isolation barrier required for each soil layer as the thickness of the basic isolation layer and taking the difference between the maximum value of the theoretical barrier thickness of the isolation barrier required for each soil layer and the thickness of the basic isolation layer as the thickness of the reinforced barrier layer comprises:
[0019] Multiplying the thickness of the foundation isolation layer by the sum of the thicknesses of all the soil layers to obtain a first dosage value;
[0020] The second dosage value is obtained by multiplying the difference between the maximum value of the theoretical barrier thickness of the isolation barrier required for each soil layer and the thickness of the basic isolation layer by the sum of the thicknesses of the soil layers whose theoretical barrier thickness is greater than that of the basic isolation layer;
[0021] The first dosage value is added to the second dosage value to obtain the total construction dosage of the isolation barrier required for the contaminated site.
[0022] The advantages of the present invention are: by calculating the total construction usage, the design result of the isolation barrier with the minimum total construction usage is selected. The isolation barrier is composed of a basic isolation wall and a local reinforced barrier wall. On the basis of meeting the requirements of the isolation barrier, the material usage and construction cost can be greatly reduced, thereby achieving the effect of energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 A schematic flow chart of a method for designing a vertical isolation barrier considering differentiated thicknesses in the present invention;
[0024] Figure 2 It is a schematic diagram of the soil layer division results and corresponding soil layer parameters in the present invention;
[0025] Figure 3 A schematic diagram of the thickness of each soil layer in the present invention and the theoretical barrier thickness of the required isolation barrier;
[0026] Figure 4 It is a schematic diagram of sorting the soil layers in the present invention;
[0027] Figure 5 It is a schematic diagram of an isolation barrier in the present invention with a minimum theoretical barrier thickness as the thickness of the basic isolation layer;
[0028] Figure 6It is a schematic diagram of an isolation barrier in the present invention with the second smallest theoretical barrier thickness as the thickness of the basic isolation layer;
[0029] Figure 7 It is a schematic diagram of an isolation barrier in the present invention with a submaximal theoretical barrier thickness as the thickness of the basic isolation layer;
[0030] Figure 8 It is a schematic diagram of an isolation barrier in the present invention with the maximum theoretical barrier thickness as the thickness of the basic isolation layer. DETAILED DESCRIPTION
[0031] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry.
[0032] In the related technology, risk control is implemented by setting up vertical isolation barriers outside the polluted area to block the migration path of pollutants and isolate the polluted medium from the surrounding environment, so as to achieve the purpose of controlling pollution risks. The design method of conventional isolation barriers is generally designed and calculated according to unfavorable working conditions, that is, according to the maximum concentration of the pollution source C0, the maximum groundwater flow rate v0 of the soil layer, the maximum diffusion coefficient of soil pollutants D0, the minimum retardation factor of soil pollution R0, and the design life T0, the calculation is performed, that is, the most unfavorable values are selected for each indicator parameter, and the thickness of the isolation barrier can be calculated. At this time, the isolation barrier adopts an indifferent thickness in the vertical direction. Although this method can simplify the construction procedure, it may lead to waste of materials and cause additional carbon emissions.
[0033] Therefore, if Figure 1 As shown, this embodiment relates to a vertical isolation barrier design method considering differentiated thickness, and the design method includes the following steps:
[0034] Step 101: Divide the contaminated site into several soil layers vertically according to the pollution situation and the stratum stratification situation.
[0035] In this embodiment, firstly, the soil layer of the actual contaminated site is divided into several layers according to the pollution situation and the stratigraphic stratification, that is, several soil layers are obtained. Among them, the pollution situation can consider one or more of the maximum concentration of the pollution source, the groundwater flow rate, the diffusion rate of pollutants, the pollution retardation factor, etc.; the stratigraphic stratification can, for example, be based on the stratigraphic profile of the contaminated site, perform rock stratigraphic division according to the lithology and lithofacies characteristics, and / or perform biostratigraphic division according to the fossils collected by the system, etc.
[0036] Step 102: Acquire soil layer parameters of each soil layer, wherein the soil layer parameters include the maximum concentration of pollution sources in the soil layer, groundwater flow velocity of the soil layer, soil layer pollutant diffusion coefficient and soil layer pollution retardation factor.
[0037] In this step, each layer of soil has corresponding soil layer parameters, which include the maximum concentration of pollution sources in the soil layer, the groundwater flow rate of the soil layer, the soil layer pollutant diffusion coefficient and the soil layer pollution retardation factor, etc. Among the above soil layer parameters, the pollution source concentration is generally obtained through pollution investigation, the groundwater flow rate and the pollutant diffusion coefficient can be obtained through hydrogeological survey, and the pollutant retardation factor is generally obtained through indoor experiments.
[0038] Step 103: Calculate the theoretical barrier thickness of the isolation barrier required for each soil layer according to the soil layer parameters of each soil layer.
[0039] After obtaining the soil layer parameters of each soil layer, the theoretical barrier thickness of the isolation barrier required for each soil layer can be calculated based on these soil layer parameters. The theoretical barrier thickness corresponds to the soil layer parameters of each soil layer. Therefore, the theoretical barrier thickness of the isolation barrier required for different soil layers is usually different.
[0040] Step 104: Determine the minimum total construction amount of the isolation barrier required for the contaminated site and the design result of the actual isolation barrier under the minimum total construction amount based on the theoretical barrier thickness of the isolation barrier required for each of the soil layers, wherein the design result includes the thickness of the vertically arranged base isolation layer, and the thickness and depth of the reinforced barrier layer located outside the base isolation layer.
[0041] In this embodiment, the actual isolation barrier is in the form of a basic isolation layer plus a reinforced barrier layer, wherein the depth of the basic isolation layer is the sum of the thicknesses of all the soil layers, that is, the basic isolation layer needs to play the role of basic isolation of pollutants in all soil layers, and the basic isolation layer is vertically arranged, specifically, vertically arranged at the periphery of the contaminated site. The reinforced barrier layer is located at the periphery of the basic isolation layer, that is, at the side of the basic isolation layer away from the contaminated site, and the reinforced barrier layer plays the role of strengthening the barrier of pollutants in the corresponding soil layer.
[0042] In this embodiment, the minimum total construction amount of the isolation barrier required for the contaminated site is first determined. Under the minimum total construction amount, the thickness of the basic isolation layer is determined, and the corresponding thickness and depth of the reinforced barrier layer are also determined accordingly. Therefore, by flexibly setting the thickness of the basic isolation layer, the thickness and depth of the reinforced barrier layer, and performing differentiated design, the minimum total construction amount of the isolation barrier can be achieved while ensuring effective isolation of pollutants, greatly reducing material usage and construction costs, and achieving the effect of energy conservation and emission reduction.
[0043] In some embodiments, the step of calculating the theoretical barrier thickness of the isolation barrier required for each soil layer according to the soil layer parameters of each soil layer comprises:
[0044] Substitute the soil layer parameters of each soil layer into the formula Calculate in order to obtain the theoretical barrier thickness of the isolation barrier required for each soil layer;
[0045] Wherein, H is the theoretical barrier thickness of the isolation barrier required by the soil layer, in meters; t is the service life of the isolation barrier, in years; D h is the diffusion coefficient of the pollutant, in m 2 / year; R d is the soil pollution barrier factor, dimensionless; C w is the initial concentration of pollutants in the contaminated site, in mg / L; v is the groundwater flow rate, in cm / s; C is the real-time concentration of pollutants in the contaminated site, in mg / L, erfc is the complementary error function, and exp is the natural exponential function.
[0046] That is to say, when calculating the theoretical barrier thickness of the isolation barrier required for each soil layer, it is only necessary to substitute the corresponding soil layer parameters of the soil layer into the above formula for calculation.
[0047] In some other embodiments, the step of determining the minimum total construction amount of the isolation barrier required for the contaminated site according to the theoretical barrier thickness of the isolation barrier required for each soil layer, and the design result of the actual isolation barrier under the minimum total construction amount includes:
[0048] The total construction amount of the isolation barrier required for the contaminated site is calculated by taking the theoretical barrier thickness of the isolation barrier required for each soil layer as the thickness of the basic isolation layer, and taking the difference between the maximum value of the theoretical barrier thickness of the isolation barrier required for each soil layer and the thickness of the basic isolation layer as the thickness of the reinforced barrier layer;
[0049] The thickness of the base isolation layer when the total construction amount of the isolation barrier required for the contaminated site is the minimum, the thickness of the reinforced barrier layer, and the thickness of the soil layer whose theoretical barrier thickness is greater than the base isolation layer are taken as the design results of the actual isolation barrier.
[0050] In this embodiment, the theoretical isolation thickness of the isolation barrier required for each soil layer is used as the thickness of the basic isolation layer, and the difference between the maximum value of the theoretical isolation thickness of the isolation barrier required for each soil layer and the thickness of the basic isolation layer is used as the thickness of the reinforced barrier layer, and the total construction amount of the isolation barrier required for multiple contaminated sites is calculated. The result with the smallest total construction amount is selected from these results, and the thickness of the basic isolation layer and the thickness of the reinforced barrier layer corresponding to the result with the smallest total construction amount are the final design results of the actual isolation barrier. Among them, the soil layer that needs to be set with a reinforced barrier layer is the soil layer with a theoretical barrier thickness greater than the thickness of the basic isolation layer, and the corresponding thickness of the reinforced barrier layer is the difference between the maximum value of the theoretical barrier thickness of the isolation barrier required for each soil layer and the thickness of the basic isolation layer, and the depth of the reinforced barrier layer is the thickness (or depth) corresponding to the soil layer with a theoretical barrier thickness greater than the thickness of the basic isolation layer.
[0051] In some embodiments, the step of calculating the total construction amount of the isolation barrier required for the contaminated site by taking the theoretical barrier thickness of the isolation barrier required for each soil layer as the thickness of the basic isolation layer and taking the difference between the maximum value of the theoretical barrier thickness of the isolation barrier required for each soil layer and the thickness of the basic isolation layer as the thickness of the reinforced barrier layer comprises:
[0052] Multiplying the thickness of the foundation isolation layer by the sum of the thicknesses of all the soil layers to obtain a first dosage value;
[0053] The second dosage value is obtained by multiplying the difference between the maximum value of the theoretical barrier thickness of the isolation barrier required for each soil layer and the thickness of the basic isolation layer by the sum of the thicknesses of the soil layers whose theoretical barrier thickness is greater than that of the basic isolation layer;
[0054] The first dosage value is added to the second dosage value to obtain the total construction dosage of the isolation barrier required for the contaminated site.
[0055] Specifically, when the theoretical barrier thickness of the isolation barrier required for a certain soil layer is taken as the thickness of the basic isolation layer, and the difference between the maximum value of the theoretical barrier thicknesses of the isolation barriers required for each soil layer and the thickness of the basic isolation layer is taken as the thickness of the reinforced barrier layer, the total construction consumption of the corresponding actual isolation barrier includes two parts, namely, the construction consumption of the basic isolation layer and the construction consumption of the reinforced barrier layer.
[0056] Since the perimeters are the same, this embodiment measures the total construction consumption of the isolation barrier with the cross-sectional area of the actual isolation barrier. Among them, the construction consumption of the basic isolation layer is the first consumption value, that is, the thickness of the basic isolation layer multiplied by the sum of the thicknesses of all soil layers; and the construction consumption of the reinforced barrier layer is the second consumption value, that is, the difference between the maximum value of the theoretical barrier thickness of the isolation barrier required for each soil layer and the thickness of the basic isolation layer multiplied by the sum of the thicknesses of all soil layers whose theoretical barrier thickness is greater than the thickness of the basic isolation layer. Finally, the first consumption value is added to the second consumption value to obtain the total construction consumption of the isolation barrier required for the contaminated site. By comparing the total construction consumption of the isolation barrier corresponding to the theoretical barrier thickness of the isolation barrier required for different soil layers as the thickness of the basic isolation layer, the minimum total construction consumption can be obtained.
[0057] The following is a specific example to introduce the above-mentioned vertical isolation barrier design method considering differentiated thickness. For the sake of convenience, the following example is taken as an example where the soil layer is divided into 4 layers. When the number of soil layers is different from 4 layers, it can be implemented as a reference.
[0058] (1) Stratum division and parameter acquisition.
[0059] According to the pollution situation and stratum stratification, the soil layer of the actual project can generally be divided into several layers, such as Figure 2 As shown in FIG. 1 , the contaminated site is divided into four soil layers, which are respectively recorded as contaminated layer ①, contaminated layer ②, contaminated layer ③ and contaminated layer ④.
[0060] Each layer has corresponding parameters, including pollutant concentration, groundwater flow rate, soil diffusion coefficient, etc., specifically:
[0061] The soil layer parameters of the polluted layer ① include: the maximum concentration of pollution sources in the polluted layer ① C1, the groundwater flow velocity in the polluted layer ① v1, the pollutant diffusion coefficient in the polluted layer ① D1, and the pollution retardation factor in the polluted layer ① R1;
[0062] The soil layer parameters of the pollution layer ② include: the maximum concentration of pollution sources in the pollution layer ② C2, the groundwater flow velocity in the pollution layer ② v2, the diffusion coefficient of pollutants in the pollution layer ② D2, and the pollution retardation factor of the pollution layer ② R2;
[0063] The soil layer parameters of the pollution layer ③ include: the maximum concentration of pollution sources in the pollution layer ③ C3, the groundwater flow velocity in the pollution layer ③ v3, the diffusion coefficient of pollutants in the pollution layer ③ D3, and the pollution retardation factor in the pollution layer ③ R3;
[0064] The soil layer parameters of pollution layer ④ include: the maximum concentration of pollution sources in pollution layer ④ C4, the groundwater flow velocity in pollution layer ④ v4, the pollutant diffusion coefficient in pollution layer ④ D4, and the pollution retardation factor in pollution layer ④ R4.
[0065] (2) Calculation of theoretical barrier thickness of isolation barriers required for different soil layers.
[0066] Substitute the soil layer parameters corresponding to the contaminated layer ①, contaminated layer ②, contaminated layer ③ and contaminated layer ④ into the formula The theoretical barrier thickness D1, D2, D3, and D4 required for each soil layer can be calculated. Figure 3 As shown, the thickness of each soil layer is recorded as h1, h2, h3, and h4 respectively.
[0067] (3) Comparison and determination of the thickness of the basic barrier layer and the thickness of the reinforced barrier layer.
[0068] First, the calculated theoretical barrier thicknesses are sorted from small to large and recorded as D min1 , D min2 , D min3 , D min4 The thickness of the soil layer corresponding to the theoretical barrier thickness is recorded as h min1 、h min2 、h min3 、h min4 The sorting results are as follows: Figure 4 shown.
[0069] Solution 1: If Figure 5 As shown, with a minimum thickness D min1 As the thickness of the basic isolation layer, at this time, the depth of the basic isolation layer is (h min1 +h min2 +h min3 +h min4 ), the thickness of the reinforced barrier layer is (D min4 -D min1 ), the depth of the enhanced barrier layer is (h min2 +h min3 +h min4 ), at this time, the total construction amount F1 of the isolation barrier is:
[0070] F1=D min1 *(h min1 +h min2 +h min3 +h min4 )+(D min4 -D min1 )*(h min2 +h min3 +h min4 ).
[0071] Solution 2: If Figure 6 As shown, the minimum thickness D min2 As the thickness of the basic isolation layer, at this time, the depth of the basic isolation layer is (h min1 +h min2+h min3 +h min4 ), the thickness of the reinforced barrier layer is (D min4 -D min2 ), the depth of the enhanced barrier layer is (h min3 +h min4 ), at this time, the total construction amount F2 of the isolation barrier is:
[0072] F2=D min2 *(h min1 +h min2 +h min3 +h min4 )+(D min4 -D min2 )*(h min3 +h min4 ).
[0073] Solution 3: If Figure 7 As shown, with the third smallest thickness D min3 As the thickness of the basic isolation layer, at this time, the depth of the basic isolation layer is (h min1 +h min2 +h min3 +h min4 ), the thickness of the reinforced barrier layer is (D min4 -D min3 ), the depth of the enhanced barrier layer is (h min4 ), at this time, the total construction amount F3 of the isolation barrier is:
[0074] F3=D min3 *(h min1 +h min2 +h min3 +h min4 )+(D min4 -D min3 )*(h min4 ).
[0075] Solution 4: If Figure 8 As shown, with a maximum thickness D min4 As the thickness of the basic isolation layer, at this time, the depth of the basic isolation layer is (h min1 +h min2 +h min3 +h min4 ), and there is no reinforced barrier layer at this time, the total construction amount F4 of the isolation barrier is:
[0076] F4=D min4 *(h min1 +h min2 +h min3 +h min4 ).
[0077] Compare F1, F2, F3, and F4 in the above schemes 1 to 4, and select the minimum value. The thickness and depth of the basic isolation layer and the reinforced isolation layer corresponding to the minimum total construction amount are the final design results of the actual isolation barrier. In other words, if F1 is the smallest, the thickness and depth of the basic isolation layer and the reinforced isolation layer are determined according to the above scheme 1; if F2 is the smallest, the thickness and depth of the basic isolation layer and the reinforced isolation layer are determined according to the above scheme 2, and so on.
[0078] In summary, the beneficial effect of the present invention is: by calculating the total construction usage, the design result of the isolation barrier with the minimum total construction usage is selected. The isolation barrier is composed of a basic isolation wall and a local reinforced barrier wall. On the basis of meeting the requirements of the isolation barrier, it can greatly reduce the material usage and construction cost, thereby achieving the effect of energy saving and emission reduction.
[0079] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the invention belongs. The words "first", "second" and similar terms used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.
[0080] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A vertical isolation barrier design method considering differentiated thickness, characterized in that: The method comprises the following steps: According to the pollution situation and stratification, the contaminated site is divided into several soil layers vertically; Obtaining soil layer parameters of each soil layer, wherein the soil layer parameters include the maximum concentration of pollution sources in the soil layer, groundwater flow velocity of the soil layer, soil layer pollutant diffusion coefficient and soil layer pollution retardation factor; Calculating the theoretical barrier thickness of the isolation barrier required for each soil layer according to the soil layer parameters of each soil layer; Based on the theoretical barrier thickness of the isolation barrier required for each of the soil layers, the minimum total construction workload of the isolation barrier required for the contaminated site and the design results of the actual isolation barrier under the minimum total construction workload are determined, wherein the design results include the thickness of the vertically arranged base isolation layer, the thickness and depth of the reinforced barrier layer located outside the base isolation layer, and the depth of the base isolation layer is the sum of the thicknesses of all the soil layers.
2. The method according to claim 1, characterized in that The step of calculating the theoretical barrier thickness of the isolation barrier required for each soil layer according to the soil layer parameters of each soil layer comprises: Substitute the soil layer parameters of each soil layer into the formula Calculate in order to obtain the theoretical barrier thickness of the isolation barrier required for each soil layer; Wherein, H is the theoretical barrier thickness of the isolation barrier required by the soil layer, in meters; t is the service life of the isolation barrier, in years; D h is the diffusion coefficient of the pollutant, in m 2 / year; R d is the soil pollution barrier factor, dimensionless; C w is the initial concentration of pollutants in the contaminated site, in mg / L; v is the groundwater flow rate, in cm / s; C is the real-time concentration of pollutants in the contaminated site, in mg / L, erfc is the complementary error function, and exp is the natural exponential function.
3. The method according to claim 1, characterized in that: The step of determining the minimum total construction amount of the isolation barrier required for the contaminated site according to the theoretical barrier thickness of the isolation barrier required for each soil layer, and the design result of the actual isolation barrier under the minimum total construction amount includes: The total construction amount of the isolation barrier required for the contaminated site is calculated by taking the theoretical barrier thickness of the isolation barrier required for each soil layer as the thickness of the basic isolation layer, and taking the difference between the maximum value of the theoretical barrier thickness of the isolation barrier required for each soil layer and the thickness of the basic isolation layer as the thickness of the reinforced barrier layer; The thickness of the base isolation layer when the total construction amount of the isolation barrier required for the contaminated site is the minimum, the thickness of the reinforced barrier layer, and the thickness of the soil layer whose theoretical barrier thickness is greater than the base isolation layer are taken as the design results of the actual isolation barrier.
4. The method according to claim 3, characterized in that The steps of calculating the total construction amount of the isolation barrier required for the contaminated site by taking the theoretical barrier thickness of the isolation barrier required for each soil layer as the thickness of the basic isolation layer and taking the difference between the maximum value of the theoretical barrier thickness of the isolation barrier required for each soil layer and the thickness of the basic isolation layer as the thickness of the reinforced barrier layer include: Multiplying the thickness of the foundation isolation layer by the sum of the thicknesses of all the soil layers to obtain a first dosage value; The second dosage value is obtained by multiplying the difference between the maximum value of the theoretical barrier thickness of the isolation barrier required for each soil layer and the thickness of the basic isolation layer by the sum of the thicknesses of the soil layers whose theoretical barrier thickness is greater than that of the basic isolation layer; The first dosage value is added to the second dosage value to obtain the total construction dosage of the isolation barrier required for the contaminated site.