CN116609836A - Geophysical simulation testing device and method for groundwater pollution - Google Patents
Geophysical simulation testing device and method for groundwater pollution Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 137
- 238000004088 simulation Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000003895 groundwater pollution Methods 0.000 title claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims description 27
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 21
- 239000011707 mineral Substances 0.000 claims description 21
- 239000011435 rock Substances 0.000 claims description 17
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 9
- 239000003673 groundwater Substances 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 8
- 230000010287 polarization Effects 0.000 claims description 8
- 238000010998 test method Methods 0.000 claims description 8
- 238000011109 contamination Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 4
- 238000010291 electrical method Methods 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims description 2
- 231100000719 pollutant Toxicity 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 11
- 238000005457 optimization Methods 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 abstract 1
- 238000003911 water pollution Methods 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 8
- 238000005755 formation reaction Methods 0.000 description 8
- 239000004927 clay Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000033558 biomineral tissue development Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
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- 230000005484 gravity Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
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- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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Abstract
The application relates to a geophysical simulation test device and method for groundwater pollution, belongs to simulation test devices, and relates to the technical field of groundwater pollution exploration. Comprises electrode wiring, an underground medium equivalent circuit module, a circuit board and an I/O port. When the device is used, the device is assembled according to designed electronic devices, the resistance and capacitance characteristics in the actual stratum are simulated through the circuits and the components on each circuit board, and the ground electricity characteristic simulation of groundwater pollution and the test of a geophysical data acquisition array can be realized in a small indoor space. The method can realize the indoor stratum simulation of geophysical prospecting for groundwater pollution, and solve the problems that a great amount of time and manpower and material resources are consumed because field scale repeated tests are required in the process of the conventional electrode array optimization technology.
Description
Technical Field
The application relates to the technical field of simulation tests, in particular to a device and a method for simulating and testing geophysical pollution of underground water.
Background
Geophysics is a discipline for observing the distribution and change of various physical fields of the earth by utilizing the principle and method of physics, exploring the medium structure, the material composition, the formation and the evolution of the earth body and the near surface, and researching various natural phenomena and change rules thereof. On the basis, geophysical derivation has led to various exploration technical means such as gravity exploration, magnetic exploration, electrical exploration, seismic exploration and the like, and is used for detecting the internal structure and construction of the earth, searching energy sources, resources, monitoring the environment and the like. The electrical prospecting is often applied to the fields of hydrogeological prospecting, groundwater pollution detection and the like because the collected electrical parameters and the hydrogeological parameters have clear relation.
The geophysical detection method for groundwater pollution is widely applied to field-scale groundwater pollution detection, but because field geologic body detection is large in scale and inconvenient to study, most of theory and simulation study are carried out in a mode of indoor and field small-scale simulation test. The indoor simulation needs a large amount of preliminary preparation work, and consumes manpower, material resources and time. On the other hand, in geophysical prospecting for groundwater contamination, the design and arrangement of the electrode array is critical to the accuracy and reliability of the groundwater contamination detection results. The electrode array used mainly comprises: gradient methods, dipole-dipole methods, symmetric quadrupole methods, and the like. However, in the practical application process, the existing electrode array cannot achieve the effects of accurate and rapid detection due to the limitation of the field and the characteristic difference of the detection target. Therefore, scholars at home and abroad research various optimization modes of the electrode array, and the optimized electrode array needs to be subjected to field-scale tests for multiple times in the research and development process to test whether the optimized electrode array meets the requirements. Although geophysical prospecting techniques have rapid advantages over other prospecting means, significant time and effort are still spent in actual field groundwater pollution detection. If a device or a testing method for testing the underground water pollution stratum and the electrode array can be rapidly simulated in a laboratory, the optimization frequency of the electrode array with the efficiency of test simulation in the underground water pollution detection room can be promoted, and the accuracy and the reliability of on-site detection can be improved.
Disclosure of Invention
The application overcomes the defects of the prior art and provides a device and a method for simulating and testing the geophysical pollution of underground water.
In order to achieve the above purpose, the application adopts the following technical scheme:
the first aspect of the application provides a geophysical simulation test device for groundwater pollution, comprising:
electrode wiring, an underground medium equivalent circuit module, a circuit board and an I/O port,
wherein the circuit board is formed by assembling a plurality of combined circuits;
the underground medium equivalent circuit modules are arranged according to preset arrangement rules, and one arrangement mode of the preset arrangement rules comprises the following steps:
the circuit of the circuit board is formed by serially connecting a plurality of underground medium equivalent circuit modules in a row-column matrix mode, each row has (n-1), each column has (n/2-1) underground medium equivalent circuit modules, and n is the number of electrodes of the array to be tested;
the head end and the tail end of each row and each column are all set to be open-circuited to simulate infinite distance, the electrode binding post positions are located in the 1 st row, one is arranged at the vertex position of each cell, and n rows are arranged.
Further, in a preferred embodiment of the present application, another arrangement mode of the preset arrangement rule includes:
each circuit board is provided with square unit cells of (n-1) x (n/2-1), the side length of each unit cell is l, the unit cells are used for simulating a unit land block with the side length of the unit cell being the actual electrode spacing x, and each side of each unit cell is provided with an underground medium equivalent circuit module;
the head end and the tail end of each row and each column are all set to be open-circuited to simulate infinite distance, the electrode binding post positions are located in the 1 st row, one is arranged at the vertex position of each cell, and n rows are arranged.
Further, in a preferred embodiment of the present application, the number of electrode wires is expanded by connecting a plurality of circuit boards in series during the testing process of the testing device.
Further, in a preferred embodiment of the present application, the underground medium equivalent circuit module is composed of a combined unit circuit of a resistor and a capacitor.
Further, in a preferred embodiment of the present application, the underground medium equivalent circuit module determines a resistance value and a capacitance value according to the main lithology characteristics of the stratum to be simulated, and selects the corresponding resistance value and capacitance value for assembly, wherein the resistance and capacitance calculation method is as follows:
the resistance R is calculated as follows:
；
wherein R is the resistance value used by the equivalent circuit module, omega; ρ is the resistivity value of the main mineral rock in the actual formation, Ω×m; x is the side length of a unit land block for simulation and m;
the capacitance C is calculated as follows:
；
wherein C is the capacitance value used by the equivalent circuit module, F; τ is the relaxation time of the excitation effect of the main mineral rock in the actual stratum, s; m is the polarizability value of main mineral rock in actual stratum, mV/V; c is a frequency correlation coefficient, and c is more than 0 and less than or equal to 1.
Further, in a preferred embodiment of the present application, the device for simulating and testing the geophysical pollution caused by groundwater is configured to determine the resistivity parameter according to the properties of minerals, wherein the resistivity ρ of the minerals is determined by the following calculation method:
；
wherein a is a constant and the value range is 2 to 6; b is the resistivity parameter of the mineral.
Further, in a preferred embodiment of the present application, the device for simulating and testing the geophysical pollution caused by groundwater is based on exploration volume theory, and the size and number of the circuit boards are determined by the following calculation modes:
；
wherein L is 1 、L 2 The length and the width of the stainless steel resistor rack are respectively m; n is the number of electrodes of the test array; k is the number of the circuit boards placed side by side, and the integer is taken; l is the side length of the cell.
Further, in a preferred embodiment of the present application, the I/O ports are n/32 KPT32p interfaces, each interface controls 32 electrode terminals, i.e. 1-32 electrode terminals from left to right are connected to one wire respectively and collected on 1 KPT32p interface.
The second aspect of the application provides a geophysical simulation test method for groundwater pollution, which is applied to any one of the geophysical simulation test devices for groundwater pollution, and comprises the following steps:
step one, an electrode array to be tested is edited in advance and is led into a testing instrument, including but not limited to ABEM Terrameter LS;
calculating a resistance value and a capacitance value required by the underground medium equivalent circuit module according to main medium characteristics of a simulated stratum required by design, and selecting a proper resistance and capacitance element for installation;
step three, designing a simulation detection target, wherein in the actual detection process, the target is a rock ore body or pollutant which has obvious electrical differences (high resistivity, high polarization rate, low resistivity and low polarization rate) with surrounding rock mass or soil body, and in the equipment simulation process, the resistance and capacitance devices at corresponding positions are replaced according to the designed target existing positions, the influence range and the response strength (the electrical differences are respectively large resistance, large capacitance, small resistance and small capacitance in sequence);
and step four, connecting the testing instrument with an I/O port of the high-density electrical data acquisition array testing device. Measuring by a high-density electrical method or an induced polarization method to obtain apparent resistivity profile information;
and fifthly, inverting the apparent resistivity or apparent polarizability profile information to obtain resistivity or polarizability profile information, and further judging and optimizing the effectiveness of the electrode array according to the resistivity or polarizability profile information so as to perform indoor test simulation of groundwater pollution detection.
The application solves the defects existing in the background technology, and has the following beneficial effects:
the application designs a geophysical simulation test device for underground water pollution and a use method thereof, which can realize the indoor simulation experiment of the electrical parameter test of an underground water pollution stratum and the indoor execution of the electrode array optimization test process, can solve the problem that a great amount of time and manpower and material resources are consumed because the field scale repeated test is required to be carried out in the existing high-density electrical electrode array optimization technical process, can quickly simulate the underground water pollution stratum and the electrode array test device or test method, and can promote the optimization frequency of the electrode array with the efficiency of the underground water pollution detection indoor test simulation, and improve the field detection precision and reliability. On the other hand, the simulated ground resistance and the simulated ground capacitance on each interface inside the device can be replaced according to parameters required by design, so that the simulation of the ground characteristics of the actual ground water pollution stratum can be realized, and a new means is provided for the indoor ground water pollution detection simulation experiment. In the aspect of practical application, the electrode array can play a role in indoor test of the electrode array in practical work, so that the working efficiency of field detection is greatly improved, and the field working time is shortened.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other embodiments of the drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a geophysical simulation test device for groundwater pollution according to the present application;
FIG. 2 is a circuit diagram of an underground medium equivalent circuit module;
FIG. 3 is a graph comparing test results with a designed formation structure.
Detailed Description
In order that the above objects, features and advantages of the application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and detailed description thereof, which are simplified schematic drawings which illustrate only the basic structure of the application and therefore show only those features which are relevant to the application, it being noted that embodiments of the application and features of the embodiments may be combined with each other without conflict.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the scope of the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may include one or more of the feature, either explicitly or implicitly. In the description of the application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art in a specific case.
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In order to further clarify the process, objects and advantages of the present application, a more particular description of the process according to embodiments of the application will be rendered by reference to the appended drawings. The application discloses a geophysical simulation testing device for groundwater pollution and a using method thereof, and aims to solve the problem that testing an optimized array in the existing electrode array optimizing process is time-consuming and labor-consuming.
A geophysical simulation test device for groundwater pollution, comprising: electrode wiring 1, underground medium equivalent circuit module 2, circuit board 3, I/O port. A geophysical simulation test device for groundwater pollution is shown in figure 1, and is characterized in that the device is a combined circuit, a circuit board is formed, and an electrical data acquisition array test system is formed by the combined circuit, a test cable and an array test instrument.
The electrode wiring 1 can be expanded in a side-by-side position according to different data acquisition methods.
The underground medium equivalent circuit module 2 is a combined unit circuit of a resistor and a capacitor, and the resistor and the capacitor on the combined unit circuit can be detached and replaced as required, as shown in fig. 2.
The underground medium equivalent circuit modules are arranged according to a certain rule, and the arrangement rule is as follows:
the circuit of the circuit board is formed by serially connecting a plurality of underground medium equivalent circuit modules in a row-column matrix mode, so that data acquisition and inversion are facilitated, the circuit board can be divided according to a unit grid mode, each circuit board is provided with 31 multiplied by 15 square unit grids, the side length of each unit grid is 0.5cm, each unit ground block with the side length of 2m of actual electrode spacing is simulated, and each side of each unit grid is provided with one underground medium equivalent circuit module.
The head end and the tail end of each row and each column are respectively provided with an open circuit to simulate infinite distance, the electrode binding post positions are positioned in the 1 st row, one is arranged at the vertex position of each cell, and 32 electrode binding posts are arranged in a row.
The underground medium equivalent circuit module can determine a resistance value and a capacitance value according to the main lithology characteristics of the stratum to be simulated. In this embodiment, the three-layer stratum is simulated to be silty sand, clay and sandstone from top to bottom in sequence, and the underground water organic pollution plume with the target body depth of 3m is set as shown in fig. 3. The resistor value and the capacitor value with proper sizes are selected for assembly, and the resistor and the capacitor are calculated as follows:
resistance R calculation:
；
wherein R is the resistance value used by the equivalent circuit module, omega; ρ is the resistivity value of the main mineral rock in the actual formation, Ω×m; x is the side length of the unit land used for simulation and m.
The value of the rock resistivity ρ of the mineral in the formula can be determined by the following formula:
；
wherein a is a constant and generally takes a value of 2 to 6; b is mineral resistivity parameter systemA number. In this embodiment, three types of strata a=1, 6,2 are set; three types of formations b=2, 1,2; formation resistivity ρ from top to bottom 1 ，ρ 2 ，ρ 3 100 Ω×m,60 Ω×m,200 Ω×m, respectively; according to a resistance calculation formula, namely, the resistance value of a resistance element of each underground medium equivalent circuit module is respectively 100 omega, 60 omega and 200 omega in three layers of stratum; wherein the value of b can be obtained from a big data network by determining the resistivity parameter coefficient according to the mineral property, for example, when the mineral property is clay, the value of the corresponding b is-1; when the mineral property is organic pollutant, the value of b is 2-3; when igneous rock, the value of b is more than 3; without data in this embodiment, a worker in the art may set different values of the resistivity parameter coefficients according to the actual situation.
Calculation of capacitance C:
；
wherein C is the capacitance value used by the equivalent circuit module, F; τ is the relaxation time of the excitation effect of the main mineral rock in the actual stratum, s; m is the polarizability value of main mineral rock in actual stratum, mV/V; c is a frequency correlation coefficient, and c is more than 0 and less than or equal to 1. Wherein the rock ore relaxation time τ and the polarizability value m can both be measured from a real mineral sample according to prior art means. The high density resistivity array tested in this example was a direct current method with three layers of capacitance set at 40 μF,200 μF,5 μF, respectively.
The size and the number of the circuit board can be determined by the following formula according to the exploration volume theory:
；
wherein L is 1 、L 2 The length and the width of the stainless steel resistor rack are respectively m; n is the number of electrodes of the test array; l in this example 1 33.5cm, L 2 16.75cm.
In this embodiment, the I/O port is 1 KPT32p interface, and 32 electrode terminals are controlled, i.e. 1-32 electrode terminals from left to right are respectively connected to a wire and collected on 1 KPT32p interface.
The device and the method can realize the indoor simulation experiment of the electrical parameter test of the underground water pollution stratum and the indoor execution of the electrode array optimizing test process, can solve the problems that a great amount of time and manpower and material resources are consumed because the field scale repeated test is required to be carried out in the existing high-density electrical method electrode array optimizing technical process, can quickly simulate the underground water pollution stratum and the electrode array test device or test method, can promote the optimizing frequency of the electrode array with the efficiency of the underground water pollution detection indoor test simulation, and can improve the field detection precision and reliability.
In this embodiment, the device is used according to the parameters designed in the above description, and the use method is as follows:
step one, an electrode array to be tested is edited in advance, in this example, the electrode array is measured by a gradient method, and the electrode array is led into a testing instrument ABEM Terrameter LS.
And secondly, selecting resistor and capacitor elements for installation, namely, 15 layers (corresponding to 15 rows on a circuit board) are arranged from top to bottom, wherein the first 6 layers, the middle 6 layers and the lowest 3 layers respectively correspond to silty sand, clay and sandstone, and the resistor and capacitor elements corresponding to the stratum structure are assembled on the resistor and capacitor elements (silty sand 100 omega, clay 60 omega and sandstone 200 omega).
And thirdly, designing a simulated underground water pollution stratum, wherein in the actual detection process, the target or the polluted underground water with high mineralization degree, which has obvious electrical difference (low resistivity) with surrounding rock mass or soil mass, is adopted, and the resistances on the 20 th-24 th unit cells of the 8 th-13 th rows on the circuit board are replaced by small resistances of 45 omega and small resistances of 50 omega.
Second, in step three, the test of the polluted groundwater with high mineralization degree with low resistivity is not limited to the test of the polluted groundwater with high mineralization degree with low resistivity, high polarization rate and low polarization rate.
And step four, connecting the testing instrument with an I/O port of the high-density electrical data acquisition array testing device. And (5) performing high-density electrical measurement or induced polarization measurement to obtain apparent resistivity profile information.
And fifthly, inverting the apparent resistivity or apparent polarizability profile information to obtain resistivity or polarizability profile information, comparing the resistivity or polarizability profile with design stratum parameters, and judging that the array is effective if the positions and the sizes of high-resistance and low-resistance responses or induced polarization responses are consistent with the design parameters.
As shown in FIG. 3, the inversion result of resistivity measurement is basically consistent with the actual simulated formation, and information such as resistivity, formation stratification, abnormal position and the like can be reflected, so that the adopted optimized array is proved to be effective.
In summary, the application designs a geophysical simulation test device for underground water pollution and a use method thereof, which can realize the indoor simulation experiment for the electrical parameter test of underground water pollution stratum and the indoor execution of the electrode array optimization test process, can solve the problem that a great deal of time and manpower and material resources are consumed because the field scale repeated test is required to be carried out in the existing high-density electrical electrode array optimization technical process, can quickly simulate the underground water pollution stratum and the electrode array test device or test method, can promote the optimization frequency of the electrode array for the efficiency of the underground water pollution detection indoor test simulation, and can improve the field detection precision and reliability. On the other hand, the simulated ground resistance and the simulated ground capacitance on each interface inside the device can be replaced according to parameters required by design, so that the simulation of the ground characteristics of the actual ground water pollution stratum can be realized, and a new means is provided for the indoor ground water pollution detection simulation experiment. In the aspect of practical application, the electrode array can play a role in indoor test of the electrode array in practical work, so that the working efficiency of field detection is greatly improved, and the field working time is shortened.
In addition, the test method can further comprise the following steps:
acquiring test data information of a test device under each test scene, judging whether the test data information is effective, constructing a database, and dividing the database into a first space and a second space;
when the test data is effective, the test data information is input into a first space of the database for storage, and when the test data is ineffective, the test data information is input into a second space of the database for storage, and test scene data information in a current test task is obtained;
inputting the test scene data information in the current test task into the database for matching, obtaining the similarity between the test scene data information in the current test task and the test scene in the first space, and distributing the test scene data information in the current test task to the test device when the similarity is a preset similarity;
and acquiring the similarity between the test scene data information in the current test task and the test scene in the second space, and not distributing the test scene data information in the current test task to the test device when the similarity is the preset similarity.
It should be noted that the test device is not only the test device in the present embodiment, but also test devices with different specifications and models. Different test scenes (such as test projects, test positions and the like) can have different test results, two types of test data can be provided, one type of test data is effective, the other type of test data is ineffective, the test results can be tracked by the method, and test scenes of successful test and unsuccessful test can be recorded, so that the test device can complete the test tasks when the test tasks of the test device are distributed, and the distribution rationality of the test device when the test device is tested is improved. The preset similarity can be set by itself, for example, 1 and 0.75, the value range of the similarity is between 0 and 1, and the larger the similarity is, the more similar the two are.
In addition, the test method can further comprise the following steps:
setting electrodes of different materials, acquiring test data information tested by the electrodes of different materials in different scenes through a testing device, and inputting the test data information tested by the electrodes of different materials in different scenes into a first space of the database for storage;
acquiring the type and the test scene of the electrode material in the current testing device, inputting the type and the test scene of the electrode material in the current testing device into the database for matching, and acquiring the historical test data information tested by the testing device;
acquiring test data information acquired by a current testing device, and comparing historical test data information tested by the testing device with the test data information acquired by the current testing device to obtain a deviation threshold;
and when the deviation threshold value is within a preset range, marking the data as accurate test data, and when the deviation threshold value is not within the preset range, marking the data as outlier data, and inputting the outlier data into a second space for storage.
It should be noted that, in the implementation process, the materials of the electrodes are different, the test results of the test data in different scenes are inconsistent, and the current test data is prejudged by recording the test data information of the electrodes made of different materials in different scenes, so that the accuracy judgment of the test data is facilitated.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
The above-described preferred embodiments according to the present application are intended to suggest that, from the above description, various changes and modifications can be made by the person skilled in the art without departing from the scope of the technical idea of the present application. The technical scope of the present application is not limited to the contents of the specification, and the technology must be determined according to the scope of claims.
Claims (9)
1. A geophysical simulation test apparatus for groundwater pollution, the apparatus comprising:
electrode wiring, an underground medium equivalent circuit module, a circuit board and an I/O port,
wherein the circuit board is formed by assembling a plurality of combined circuits;
the underground medium equivalent circuit modules are arranged according to preset arrangement rules, and one arrangement mode of the preset arrangement rules comprises the following steps:
the circuit of the circuit board is formed by serially connecting a plurality of underground medium equivalent circuit modules in a row-column matrix mode, each row has (n-1), each column has (n/2-1) underground medium equivalent circuit modules, and n is the number of electrodes of the array to be tested;
the head end and the tail end of each row and each column are all set to be open-circuited to simulate infinite distance, the electrode binding post positions are located in the 1 st row, one is arranged at the vertex position of each cell, and n rows are arranged.
2. The device of claim 1, wherein the other of the predetermined arrangement rules comprises:
each circuit board is provided with square unit cells of (n-1) x (n/2-1), the side length of each unit cell is l, the unit cells are used for simulating a unit land block with the side length of the unit cell being the actual electrode spacing x, and each side of each unit cell is provided with an underground medium equivalent circuit module;
the head end and the tail end of each row and each column are all set to be open-circuited to simulate infinite distance, the electrode binding post positions are located in the 1 st row, one is arranged at the vertex position of each cell, and n rows are arranged.
3. The device of claim 1, wherein the number of electrode wires is expanded by connecting a plurality of circuit boards in series during testing of the device.
4. The device for simulating geophysical contamination test of claim 1, wherein the underground dielectric equivalent circuit module is comprised of a combined resistive and capacitive element circuit.
5. The device according to claim 1, wherein the underground medium equivalent circuit module determines a resistance value and a capacitance value according to main lithology characteristics of a stratum to be simulated, and selects the corresponding resistance value and capacitance value for assembly, wherein the resistance and capacitance are calculated as follows:
the resistance R is calculated as follows:
；
wherein R is the resistance value used by the equivalent circuit module, omega; ρ is the resistivity value of the main mineral rock in the actual formation, Ω×m; x is the side length of a unit land block for simulation and m;
the capacitance C is calculated as follows:
；
wherein C is the capacitance value used by the equivalent circuit module, F; τ is the relaxation time of the excitation effect of the main mineral rock in the actual stratum, s; m is the polarizability value of main mineral rock in actual stratum, mV/V; c is a frequency correlation coefficient, and c is more than 0 and less than or equal to 1.
6. A geophysical simulation test apparatus for groundwater contamination according to claim 5,
by determining the resistivity parameter factor from the mineral properties, the value of the resistivity ρ of the mineral rock can be determined by the following calculation:
；
wherein a is a constant and the value range is 2 to 6; b is the resistivity parameter of the mineral.
7. The groundwater contamination geophysical simulation test apparatus of claim 1 wherein the size and number of circuit boards is determined according to exploration volume theory by the following calculation:
；
wherein L is 1 、L 2 The length and the width of the stainless steel resistor rack are respectively m; n is the number of electrodes of the test array; k is the number of the circuit boards placed side by side, and the integer is taken; l is the side length of the cell.
8. The device for simulating geophysical pollution testing of groundwater in accordance with claim 1, wherein said I/O ports are n/32 KPT32p interfaces, each interface controls 32 electrode terminals, i.e. 1-32 electrode terminals from left to right are each connected to a wire and collected on 1 KPT32p interface.
9. A geophysical simulation test method for groundwater pollution, wherein the test method is applied to a geophysical simulation test device for groundwater pollution according to any one of claims 1 to 8, and comprises the following steps:
step one, an electrode array to be tested is edited in advance and is led into a testing instrument, including but not limited to ABEM Terrameter LS;
calculating a resistance value and a capacitance value required by the underground medium equivalent circuit module according to main medium characteristics of a simulated stratum required by design, and selecting a proper resistance and capacitance element for installation;
step three, designing a simulated detection target, wherein in the actual detection process, the target is a rock-ore body or pollutant which has obvious electrical difference with surrounding rock mass or soil mass, and in the equipment simulation process, resistance and capacitance devices at corresponding positions are replaced according to the designed target existing positions, influence ranges and response intensities;
step four, connecting a testing instrument with an I/O port of a high-density electrical data acquisition array testing device, and measuring by a high-density electrical method or an induced polarization method to obtain apparent resistivity profile information;
and fifthly, inverting the apparent resistivity or apparent polarizability profile information to obtain resistivity or polarizability profile information, and further judging and optimizing the effectiveness of the electrode array according to the resistivity or polarizability profile information so as to perform indoor test simulation of groundwater pollution detection.
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