Conductive concrete retaining wall grounding resistance measuring method and terminal

Abstract

The invention discloses a conductive concrete retaining wall grounding resistance measurement method and a terminal, and the method comprises the steps: measuring the geometric parameters of a conductive concrete retaining wall and the resistivity of conductive concrete, and measuring the resistivity of soil in a preset region; acquiring a grounding resistance measurement value of the conductive concrete retaining wall through a grounding resistance tester; calculating equivalent resistivity according to the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall and the resistivity of the conductive concrete; calculating a grounding resistance correction factor according to the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall and the equivalent resistivity; and according to the grounding resistance correction factor and the grounding resistance measurement value, calculating a grounding resistance true value of the conductive concrete protection wall. In this way, accurate measurement of the grounding resistance of the conductive concrete retaining wall can be realized, and the measurement accuracy and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power engineering grounding, in particular to a conductive concrete retaining wall grounding resistance measurement method and terminal. BACKGROUND

[0002] At present, conductive concrete is gradually applied to tower foundation retaining wall, building deep foundation pit support and other scenes due to its good conductivity and plasticity, and has the function of grounding, which can effectively reduce the grounding resistance and improve the current distribution. However, it is challenging to accurately measure the grounding resistance of such composite structure. Assuming that the grounding electrode is a metal conductor and the surrounding medium is relatively uniform, the conductive concrete retaining wall has the following characteristics: (1) its size is much larger than that of the traditional metal grounding electrode, forming a "volume type" grounding body with a certain thickness; (2) its resistivity is between good conductor and soil, and is usually anisotropic; (3) the retaining wall structure changes the electric field distribution in the surrounding soil. If the traditional grounding resistance measurement (such as three-pole method) is directly used, the layout position of the current pole and the voltage pole and the composition of the measurement circuit are easily disturbed by the low resistance characteristics of the retaining wall body itself, which leads to a serious deviation of the measurement value from the true grounding resistance, and the grounding performance cannot be accurately evaluated, which poses a hidden danger to the safe operation of the power system. Therefore, there is an urgent need for a special grounding resistance measurement method for the structural characteristics of the conductive concrete retaining wall to solve the problem of poor precision of the existing measurement technology. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a conductive concrete retaining wall grounding resistance measurement method and terminal, which can accurately measure the grounding resistance of the conductive concrete retaining wall and improve the measurement accuracy and efficiency.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is: A conductive concrete retaining wall grounding resistance measurement method, comprising the steps of: measuring the geometric parameters of the conductive concrete retaining wall and the resistivity of the conductive concrete, and simultaneously measuring the resistivity of the soil in the preset area; obtaining the grounding resistance measurement value of the conductive concrete retaining wall by a grounding resistance tester; calculating the equivalent resistivity according to the resistivity of the soil and the geometric parameters of the conductive concrete retaining wall and the resistivity of the conductive concrete; calculating the grounding resistance correction factor according to the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall and the equivalent resistivity; calculating the real value of the grounding resistance of the conductive concrete retaining wall according to the grounding resistance correction factor and the grounding resistance measurement value.

[0005] In order to solve the above technical problems, another technical solution adopted by the present application is: A conductive concrete retaining wall grounding resistance measurement terminal, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program and realizes each step of the conductive concrete retaining wall grounding resistance measurement method.

[0006] The present application has the beneficial effects that: the present application provides a conductive concrete retaining wall grounding resistance measurement method and terminal, by measuring the geometric parameters of the conductive concrete retaining wall, the resistivity of the conductive concrete and the resistivity of the soil in the preset area, the comprehensiveness of the basic data is ensured, and a reliable foundation is laid for subsequent calculation; according to the basic data, the equivalent resistivity is calculated, which can reflect the resistivity of the overall conductive performance of the conductive concrete and soil composite medium, and according to the basic data and the equivalent resistivity, the grounding resistance correction factor is calculated, which can effectively compensate the measurement error and the influence of the conductive concrete retaining wall, and improve the measurement accuracy; the grounding resistance measurement value of the conductive concrete retaining wall is obtained through the grounding resistance tester, the data is quickly collected, the grounding resistance true value of the conductive concrete retaining wall is calculated by combining the grounding resistance correction factor and the grounding resistance measurement value, the precision and reliability of the grounding resistance measurement are improved, and a scientific basis is provided for the performance evaluation of the conductive concrete retaining wall. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 A flowchart of a conductive concrete retaining wall grounding resistance measurement method according to an embodiment of the present application; Figure 2 Another flowchart of a conductive concrete retaining wall grounding resistance measurement method according to an embodiment of the present application; Figure 3 A electrode layout plan of a grounding resistance tester according to an embodiment of the present application; Figure 4 A schematic diagram of a conductive concrete retaining wall grounding resistance measurement terminal according to an embodiment of the present application; REFERENCE NUMERALS: 1. A conductive concrete retaining wall grounding resistance measurement terminal; 2. Memory; 3. Processor. DETAILED DESCRIPTION

[0008] To explain the technical content, purposes and effects of the present application in detail, the following will be explained in combination with the embodiments and the drawings.

[0009] Before the embodiments of the present application are described in detail, some related concepts will be explained first: (1) Grounding resistance: the resistance encountered by the current flowing from the grounding device into the earth and then spreading to another grounding body or to a distant place, the grounding resistance value reflects the good degree of the electrical device contacting the "ground" and reflects the scale of the grounding grid; (2) Grounding down conductor: a metal conductor used to connect electrical equipment and grounding body, which belongs to the conductive part of the power system and mainly undertakes the function of connecting the grounding terminal of electrical equipment and tower with the grounding body.

[0010] At present, conductive concrete has been gradually applied to tower foundation protection wall, building deep foundation pit support and other engineering scenes due to its excellent conductive performance and structural plasticity. In such applications, it not only plays the function of the main structure, but also has the grounding effect, which can effectively reduce the grounding resistance and enhance the fault current dispersion capacity, thereby improving the system safety. However, due to the significant differences in structure and material properties between the conductive concrete protection wall and the traditional metal grounding electrode, the accurate measurement of the grounding resistance of the conductive concrete protection wall faces special challenges: first, the geometric size of the protection wall is much larger than that of the traditional grounding electrode, forming a "volume type" grounding body with a certain thickness; second, the material resistivity of the protection wall is between a good conductor and typical soil, and often shows anisotropic characteristics; third, the protection wall structure will significantly change the distribution pattern of the electric field in the surrounding soil. If the traditional measurement method (such as the three-pole method) is directly used, the layout positions of the current pole and the voltage pole and the measurement loop are easily disturbed by the low resistance characteristics of the protection wall, causing the measurement result to deviate seriously from the true grounding resistance value, making it difficult to accurately evaluate the grounding performance of the protection wall, and bringing potential risks to the safe operation of the power system.

[0011] To at least solve the above problems, please refer to Figure 1 The embodiment of the present application provides a conductive concrete protection wall grounding resistance measurement method, which comprises the following steps: Measuring the geometric parameters of the conductive concrete protection wall and the resistivity of the conductive concrete, and simultaneously measuring the resistivity of the soil in the preset area; Obtaining the grounding resistance measurement value of the conductive concrete protection wall by a grounding resistance tester; Calculating the equivalent resistivity according to the resistivity of the soil and the geometric parameters of the conductive concrete protection wall and the resistivity of the conductive concrete; Calculating the grounding resistance correction factor according to the resistivity of the soil, the geometric parameters of the conductive concrete protection wall and the equivalent resistivity; Calculating the true value of the grounding resistance of the conductive concrete protection wall according to the grounding resistance correction factor and the grounding resistance measurement value.

[0012] From the above description, the beneficial effects of the present application are that by measuring the geometric parameters of the conductive concrete retaining wall, the resistivity of the conductive concrete and the resistivity of the soil on the preset area, the comprehensiveness of the basic data is ensured, and a reliable foundation is laid for subsequent calculation of the true value of the grounding resistance; according to the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall and the resistivity of the conductive concrete, the equivalent resistivity is calculated, which can effectively represent the overall conductive characteristics of the conductive concrete retaining wall-soil composite medium; combined with the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall and the equivalent resistivity, the grounding resistance correction factor is calculated, which can quantitatively correct the influence caused by measurement error and conductive concrete retaining wall, and improve the measurement accuracy; through the grounding resistance tester, the grounding resistance measurement value of the conductive concrete retaining wall is obtained, combined with the grounding resistance correction factor and the grounding resistance measurement value, the true value of the grounding resistance of the conductive concrete retaining wall is calculated, which significantly improves the accuracy and reliability of the grounding resistance measurement on the conductive concrete retaining wall of this kind of "volume type" non-uniform grounding body, and provides a scientific basis for performance evaluation of the conductive concrete retaining wall.

[0013] Further, the geometric parameters of the conductive concrete retaining wall and the resistivity of the conductive concrete are measured, and the resistivity of the soil on the preset area is measured at the same time, including: record the geometric parameters of the conductive concrete retaining wall obtained by surveying, and obtain the resistivity of the conductive concrete measured by using the four-probe method or the core sample drilling method; obtain the resistivity of the soil on the preset area measured by using the Wenner four-pole method, the preset area being an area at a first preset distance from the conductive concrete retaining wall.

[0014] From the above description, the geometric parameters of the conductive concrete retaining wall obtained by surveying are recorded, and the resistivity of the conductive concrete is measured by using the four-probe method or the core sample drilling method, so as to accurately obtain the true conductive characteristics thereof; the resistivity of the soil is measured by using the Wenner four-pole method on the preset area at a certain distance from the retaining wall, which effectively avoids the interference of the conductive concrete retaining wall, so as to obtain the resistivity reflecting the true situation of the soil. Through these measured data, reliable basic data are laid for equivalent resistivity calculation and grounding resistance correction, which jointly guarantee the accuracy of grounding resistance measurement.

[0015] Further, the grounding resistance measurement value of the conductive concrete retaining wall is obtained by using the grounding resistance tester, which includes the following steps: perform electrode arrangement of the grounding resistance tester, the grounding resistance tester including a grounding downlead connection point, a current electrode, a first voltage electrode and a second voltage electrode; the grounding downlead connection point is connected with the grounding downlead of the conductive concrete retaining wall, and the current electrode is arranged at a second preset distance from the center position of the conductive concrete retaining wall; The first voltage electrode is located on the line connecting the current electrode and the center of the conductive concrete retaining wall, and the distance between the first voltage electrode and the center of the conductive concrete retaining wall is less than the second preset distance; The second voltage electrode is located in the direction perpendicular to the connecting line, and the distance between the second voltage electrode and the center of the conductive concrete retaining wall is equal to the distance between the first voltage electrode and the center of the conductive concrete retaining wall.

[0016] As described above, by connecting the grounding down conductor connection point to the sheath grounding down conductor and arranging current electrodes at a second preset distance, a stable current measurement circuit is constructed. By arranging the first voltage electrode along the line connecting the center of the sheath and the current electrode, and arranging the second voltage electrode at equal intervals in the direction perpendicular to the line, a spatially intersecting potential detection layout is formed. This effectively captures the actual distribution characteristics of the electric field around the sheath, significantly reduces the impact of electric field distortion caused by the low resistance characteristics of the sheath on the measurement results, and provides a reliable on-site detection basis for obtaining accurate grounding resistance measurement values.

[0017] Further, the grounding resistance of the conductive concrete retaining wall is obtained using a grounding resistance tester, including: The grounding resistance tester is used to verify the correctness of the electrode layout, and the grounding resistance measurement value of the conductive concrete retaining wall is obtained using the verified grounding resistance tester.

[0018] As described above, by verifying the correctness of the electrode layout of the grounding resistance tester, measurement errors caused by electrode position deviations can be effectively avoided. Furthermore, by using a verified grounding resistance tester to obtain grounding resistance measurements, the accuracy and reliability of the measurements are ensured, providing a reliable data foundation for subsequent calculations of the true grounding resistance value.

[0019] Furthermore, the correctness of the electrode layout of the grounding resistance tester is verified, including: Start the grounding resistance tester and calculate the first grounding resistance value based on the measured current value and the potential difference between the first voltage electrode; Switch the voltage pole of the grounding resistance tester to the second voltage pole, and calculate the second grounding resistance value based on the potential difference between the measured current value and the second voltage pole. Calculate the absolute difference between the first grounding resistance value and the second grounding resistance value. If the ratio of the absolute difference to the first grounding resistance value is less than a preset threshold, it is determined that the electrode layout of the grounding resistance tester is correct. Otherwise, adjust the positions of the first voltage electrode and the second voltage electrode, restart the grounding resistance tester for measurement, until the electrode layout of the grounding resistance tester is correct.

[0020] As described above, cross-verification is achieved by measuring the grounding resistance values ​​corresponding to the first and second voltage poles respectively, thereby enabling a quantitative assessment of the electrode placement quality and ensuring the validity of the measurement data. By calculating the absolute deviation between the two sets of resistance values ​​and comparing them with a preset threshold, an objective criterion for placement correctness is established. When the conditions are not met, the electrode position is automatically adjusted and remeasured until the electrode placement is correct, effectively eliminating measurement errors caused by improper voltage pole positions and ensuring the standardization of electrode placement and the reliability of measurement data.

[0021] Further, the equivalent resistivity is calculated based on the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall, and the resistivity of the conductive concrete, including: The equivalent cross-sectional area and equivalent soil cross-sectional area of ​​the conductive concrete retaining wall are calculated based on the geometric parameters of the conductive concrete retaining wall. Based on the soil resistivity ρ s The equivalent cross-sectional area A of the conductive concrete retaining wall c Equivalent soil cross-sectional area A s and the resistivity ρ of the conductive concrete c Calculate the equivalent resistivity ρ eq : .

[0022] As described above, by calculating the equivalent cross-sectional area of ​​the conductive concrete retaining wall and the equivalent soil cross-sectional area, the actual complex geometric structure is simplified into quantitative evaluation data. Based on the equivalent cross-sectional area, the equivalent soil cross-sectional area, the resistivity of the conductive concrete, and the resistivity of the soil, the equivalent resistivity is calculated. The parallel conductivity effect of the concrete retaining wall material and the surrounding soil is comprehensively considered, which can accurately characterize the overall conductivity of the retaining wall-soil composite medium and provide key parameter basis for subsequent grounding resistance correction.

[0023] Furthermore, the calculation of the equivalent soil cross-sectional area includes: An empirical coefficient is established based on the soil mass and the density of the conductive concrete retaining wall. The equivalent soil cross-sectional area A is calculated based on the empirical coefficient and the equivalent cross-sectional area of ​​the conductive concrete retaining wall. s : A s =k·A c ; In the formula, k represents the empirical coefficient.

[0024] As described above, by setting empirical coefficients based on soil quality and the density of conductive concrete retaining wall, key influencing parameters of the actual engineering environment can be considered, enhancing the applicability of the measurement method. The equivalent soil cross-sectional area is calculated based on empirical coefficients and equivalent cross-sectional area, simplifying the complex soil-retaining wall interaction into a quantifiable proportional relationship, avoiding complex on-site survey procedures, and improving the calculation efficiency of equivalent resistivity.

[0025] Further, the grounding resistance correction factor is calculated based on the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall, and the equivalent resistivity, including: The grounding resistance correction factor is calculated based on the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall, and the equivalent resistivity: ; In the formula, K represents the grounding resistance correction factor; α represents the shape correlation coefficient of the conductive concrete retaining wall; ρ eq Represents the equivalent resistivity; ρ s t represents the resistivity of the soil; t represents the average thickness of the conductive concrete retaining wall; L represents the equivalent diameter or diagonal length of the conductive concrete retaining wall.

[0026] As described above, the grounding resistance correction factor can be calculated by combining soil resistivity, geometric parameters of conductive concrete retaining wall, and equivalent resistivity. This can effectively correct measurement errors and interference from retaining wall structure, and significantly improve the accuracy and reliability of the grounding resistance calculation.

[0027] Further, the true value of the grounding resistance of the conductive concrete retaining wall is calculated based on the grounding resistance correction factor and the measured grounding resistance value, including: Substituting the grounding resistance correction factor and the measured grounding resistance value into the formula, the true grounding resistance value of the conductive concrete retaining wall is calculated. The formula is: R true =K·R m ; In the formula, R true This represents the true value of the grounding resistance of the conductive concrete retaining wall; K represents the grounding resistance correction factor; R m This indicates the measured value of the grounding resistance obtained by the grounding resistance tester.

[0028] As described above, the grounding resistance measurement value of the conductive concrete retaining wall is calculated based on the grounding resistance correction factor and the grounding resistance measurement value, thereby achieving accurate correction of the measurement results, effectively compensating for the influence caused by the conductive concrete retaining wall, providing a reliable basis for objectively evaluating the grounding performance of the conductive concrete retaining wall, and ensuring the effectiveness of the grounding safety assessment.

[0029] Please refer toFigure 4 Another embodiment of the present invention provides a grounding resistance measurement terminal for conductive concrete retaining walls, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the various steps of the above-described method for measuring the grounding resistance of conductive concrete retaining walls.

[0030] The above-described method and terminal for measuring the grounding resistance of conductive concrete retaining walls of this invention can accurately measure the grounding resistance of conductive concrete, improving measurement accuracy and efficiency. The following detailed embodiments illustrate this method: Please refer to Figure 1 and Figure 2 One embodiment of the present invention is as follows: A method for measuring the grounding resistance of conductive concrete retaining walls includes the following steps: S1. Measure the geometric parameters of the conductive concrete retaining wall and the resistivity of the conductive concrete, and simultaneously measure the resistivity of the soil in the preset area, specifically including: Record the geometric parameters of the conductive concrete retaining wall obtained from the survey, and obtain the resistivity of the conductive concrete measured using the four-probe method or the core sampling method. The resistivity of the soil in a preset area is obtained by measuring the resistivity using the Winner quadrupole method. The preset area is the area at a first preset distance from the conductive concrete retaining wall.

[0031] In this embodiment, the geometric parameters of the conductive concrete retaining wall are surveyed and recorded on-site, including the average thickness t and the equivalent diameter (for a circular conductive concrete retaining wall) or diagonal length (for a rectangular conductive concrete retaining wall) L; the resistivity ρ of the conductive concrete is obtained by measuring using the four-probe method or core sampling method. c Simultaneously, in the area far from the influence of the retaining wall (i.e., the area at a first preset distance from the conductive concrete retaining wall), the soil resistivity ρ in this area was measured using the Wenner quadrupole method. s This ensures that the measured data accurately reflects the original resistivity characteristics of the soil surrounding the retaining wall.

[0032] S2. Obtain the grounding resistance measurement value of the conductive concrete retaining wall using a grounding resistance tester, specifically including S2.1-S2.3. S2.1. The electrodes of the grounding resistance tester are arranged, and the grounding resistance tester includes a grounding lead connection point, a current electrode, a first voltage electrode, and a second voltage electrode. The grounding down conductor connection point is connected to the grounding down conductor of the conductive concrete retaining wall, and the current electrode is set at a second preset distance from the center of the conductive concrete retaining wall. The first voltage electrode is located on the line connecting the current electrode and the center of the conductive concrete retaining wall, and the distance between the first voltage electrode and the center of the conductive concrete retaining wall is less than the second preset distance; The second voltage electrode is located in the direction perpendicular to the connecting line, and the distance between the second voltage electrode and the center of the conductive concrete retaining wall is equal to the distance between the first voltage electrode and the center of the conductive concrete retaining wall.

[0033] In this embodiment, the grounding resistance tester includes a grounding lead connection point, a current electrode, a first voltage electrode, and a second voltage electrode. The grounding lead connection point is used to connect the grounding lead of the conductive concrete retaining wall under test. The current electrode is a metal grounding rod used to inject the measuring current. Both the first voltage electrode and the second voltage electrode are metal grounding rods used to measure the potential difference. The first voltage electrode is the main voltage electrode, and the second voltage electrode is the auxiliary voltage electrode used to verify the measurement accuracy.

[0034] Please refer to Figure 3 Using the center O of the conductive concrete retaining wall as the reference point, connect the C terminal (i.e., the grounding down conductor connection point) of the grounding resistance tester to the grounding down conductor of the conductive concrete retaining wall; calculate and determine the position of the current electrode C2 (D) based on the equivalent diameter L of the conductive concrete retaining wall. CC2 ≥4L), drive C2 into the corresponding ground position; on the line connecting C2 and the center O of the conductive concrete retaining wall, determine the position of the first voltage electrode P1 (D). CP1 =0.6×D CC2 ), drive P1 into the corresponding ground position; determine the position of the second voltage electrode P2 (D) in the direction perpendicular to the C2-O line. CP2 =D CP1 Add P2 to the corresponding ground position.

[0035] S2.2, Verify the correctness of the electrode layout of the grounding resistance tester, including: Start the grounding resistance tester and calculate the first grounding resistance value based on the measured current value and the potential difference between the first voltage electrode; Switch the voltage pole of the grounding resistance tester to the second voltage pole, and calculate the second grounding resistance value based on the potential difference between the measured current value and the second voltage pole. Calculate the absolute difference between the first grounding resistance value and the second grounding resistance value. If the ratio of the absolute difference to the first grounding resistance value is less than a preset threshold, it is determined that the electrode layout of the grounding resistance tester is correct. Otherwise, adjust the positions of the first voltage electrode and the second voltage electrode, restart the grounding resistance tester for measurement, until the electrode layout of the grounding resistance tester is correct.

[0036] In this embodiment, the test leads are connected, the grounding resistance tester is turned on, and the first grounding resistance value R is calculated based on the measured current value I and the potential difference V between the first voltage electrode. m Switch the voltage electrode to the second voltage electrode and measure the second resistance value R again. m2 If |R m R m2 | / R m If the value is less than 10%, the electrode layout of the grounding resistance tester is considered correct and the data is valid; otherwise, the positions of P1 and P2 should be adjusted and the measurement repeated until the electrode layout of the grounding resistance tester is correct.

[0037] S2.3. Use a calibrated grounding resistance tester to obtain the grounding resistance measurement value of the conductive concrete retaining wall.

[0038] S3. Calculate the equivalent resistivity based on the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall, and the resistivity of the conductive concrete, specifically including S3.1-S3.2.

[0039] S3.1 Calculate the equivalent cross-sectional area of ​​the conductive concrete retaining wall based on its geometric parameters; An empirical coefficient is set based on the soil mass and the density of the conductive concrete retaining wall. The equivalent soil cross-sectional area is then calculated based on the empirical coefficient and the equivalent cross-sectional area of ​​the conductive concrete retaining wall. A s =k·A c ; In the formula, A s Represents the equivalent soil cross-sectional area; A c denoted by , where k represents the equivalent cross-sectional area of ​​the conductive concrete retaining wall.

[0040] In this embodiment, the equivalent cross-sectional area A of the conductive concrete retaining wall is calculated based on the geometric parameters obtained from the survey. c An empirical coefficient k is set based on the site soil conditions and the density of the conductive concrete retaining wall. The value of the empirical coefficient ranges from 2 to 5, according to formula A. s =k·A c The equivalent soil cross-sectional area A was calculated. s This simplifies the complex soil-wall interaction into a quantifiable proportional relationship, avoiding complex field survey procedures and improving the calculation efficiency of equivalent resistivity.

[0041] S3.2, Based on the resistivity ρ of the soil s The equivalent cross-sectional area A of the conductive concrete retaining wall c Equivalent soil cross-sectional area A sand the resistivity ρ of the conductive concrete c Calculate the equivalent resistivity ρ eq : .

[0042] In this embodiment, the calculation process of equivalent resistivity is specifically as follows: based on the soil resistivity ρ s (Unit: Ω·m) Equivalent cross-sectional area A of conductive concrete retaining wall c (Unit: m) 2 Equivalent soil cross-sectional area A s (Unit: m) 2 and the resistivity ρ of conductive concrete c (Unit: Ω·m) Calculate the equivalent resistivity ρ of the conductive concrete retaining wall and surrounding soil using the formula. eq (Unit: Ω·m): ; Since conductive concrete (low resistivity) and soil (high resistivity) are two different materials, the current passing through them is affected by both. This formula essentially simulates the combined resistivity of the two materials when they are "connected in parallel" along the current path. That is, the equivalent resistivity is the combined value of the resistivity of conductive concrete and soil. It is calculated based on the cross-sectional area and conductivity of the two materials to represent the overall conductivity. If the concrete has good conductivity (low resistivity) but the soil has poor conductivity, the equivalent resistivity will fall between the two, biased towards the material with the larger cross-sectional area or lower conductivity.

[0043] S4. Calculate the grounding resistance correction factor based on the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall, and the equivalent resistivity, specifically including: The grounding resistance correction factor is calculated based on the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall, and the equivalent resistivity: ; In the formula, K represents the grounding resistance correction factor; α represents the shape correlation coefficient of the conductive concrete retaining wall; ρ eq Represents the equivalent resistivity; ρ s t represents the resistivity of the soil; t represents the average thickness of the conductive concrete retaining wall; L represents the equivalent diameter or diagonal length of the conductive concrete retaining wall.

[0044] In this embodiment, the grounding resistance correction factor K is used to correct the measurement deviation caused by the presence of the retaining wall. Its calculation process is as follows: based on the soil resistivity ρ... s (Unit: Ω·m), Geometric parameters and equivalent resistivity ρ of conductive concrete retaining wall eq(Unit: Ω·m) Calculate the grounding resistance correction factor, where the geometric parameters of the conductive concrete retaining wall include the shape correlation coefficient α (0.8 if the retaining wall is circular; 1.0 if the retaining wall is rectangular), the average thickness t of the conductive concrete retaining wall (unit: m), and the equivalent diameter or diagonal length L of the conductive concrete retaining wall (L is the equivalent diameter if the retaining wall is circular; L is the diagonal length if the retaining wall is rectangular). Calculate the grounding resistance correction factor K using the formula: ; This formula is used to calculate the grounding resistance correction factor. Because the size and material of the conductive concrete retaining wall will distort the surrounding electric field, the resistance value measured by traditional measurement methods will deviate from the true value. The grounding resistance correction factor is an amplification factor that can effectively compensate for the measurement deviation caused by the distortion of the electric field by the conductive concrete retaining wall. The thicker the retaining wall, the larger the size, or the greater the difference in resistivity between the retaining wall material and the soil, the larger the correction factor, which means that the measurement error is more significant.

[0045] S5. Calculate the true grounding resistance value of the conductive concrete retaining wall based on the grounding resistance correction factor and the measured grounding resistance value, specifically including: Substituting the grounding resistance correction factor and the measured grounding resistance value into the formula, the true grounding resistance value of the conductive concrete retaining wall is calculated. The formula is: R true =K·R m ; In the formula, R true This represents the true value of the grounding resistance of the conductive concrete retaining wall; K represents the grounding resistance correction factor; R m This indicates the measured value of the grounding resistance obtained by the grounding resistance tester.

[0046] In this embodiment, R m This is the initial value of the grounding resistance measured by a grounding resistance tester. However, due to the influence of the conductive concrete retaining wall, this value is usually too low. By multiplying it by a correction factor K, the error caused by the conductive concrete retaining wall can be eliminated, resulting in a more accurate value R of the actual grounding resistance. ture This provides a reliable basis for objectively evaluating the grounding performance of conductive concrete retaining walls and ensures the effectiveness of grounding safety assessment.

[0047] In this embodiment, a specific application scenario is also provided, taking the measurement of the grounding resistance of the conductive concrete retaining wall foundation of a 110kV transmission line tower as an example: The tower foundation uses a circular conductive concrete retaining wall with an outer diameter L of 1.5 meters and a wall thickness t of 0.3 meters. A portable concrete resistivity tester (four-probe method) was used to perform non-destructive testing on the retaining wall, and the resistivity ρ of the conductive concrete was measured.c The soil resistivity ρ was measured at a distance of 5 Ω·m from the retaining wall at a distance of 20 meters. The measurement was performed using the Wenner quadrupole method. s It is 100 Ω·m.

[0048] The grounding resistance of the conductive concrete retaining wall is measured using a grounding resistance tester: Using the center O of the circular conductive concrete retaining wall as a reference, the grounding down conductor connection point is connected to the grounding down conductor of the conductive concrete retaining wall; the distance between the current electrodes C2 and D is determined. CC2 ≥ 4 * 1.5m = 6m, actually take 7 meters; Determine the distance to the first voltage pole P1: D CP1 = 0.6 * 7m = 4.2 meters; Arrange the second voltage electrode P2 in a direction perpendicular to the line connecting C2 and O, also 4.2 meters away from point O; Drive in each electrode as required to complete the electrode layout of the grounding resistance tester; Start the grounding resistance tester and measure the initial grounding resistance value R. m =3.8Ω; R was measured when switching to the second voltage pole P2. m2 =3.9Ω, relative error is 2.6%, less than 10%, data is valid.

[0049] Calculate the equivalent resistivity: Assume A s = 3A c (k=3), substituting into the formula, we get ρ eq ≈ 14.3 Ω·m. Calculate the correction factor: The conductive concrete retaining wall is cylindrical (α=0.8), and substituting it into the formula, we get K ≈ 1.05. Calculate the actual grounding resistance: R true = 1.05 * 3.8 Ω ≈ 4.0 Ω. The measurement results show that without correction, a direct reading of 3.8Ω would underestimate the grounding resistance. After correction using the method of this invention, a more accurate grounding resistance value of 4.0Ω is obtained, providing accurate data for operation and maintenance decisions. Moreover, the entire process does not require damage to the retaining wall structure, achieving rapid and accurate on-site measurement.

[0050] In summary, this invention provides a method and terminal for measuring the grounding resistance of conductive concrete retaining walls. By measuring the geometric parameters of the conductive concrete retaining wall, the resistivity of the conductive concrete, and the resistivity of the soil in a preset area, the comprehensiveness of the basic data is ensured, laying a reliable foundation for subsequent calculations. The equivalent resistivity is calculated based on the basic data, reflecting the overall conductive performance of the conductive concrete and soil composite medium. Furthermore, a grounding resistance correction factor is calculated based on the basic data and the equivalent resistivity to effectively compensate for measurement errors and the influence of the conductive concrete retaining wall, improving measurement accuracy. The electrode layout of the grounding resistance tester is verified for correctness. Using a verified grounding resistance tester, the measured grounding resistance value of the conductive concrete retaining wall is obtained, enabling rapid data acquisition. Combining the grounding resistance correction factor and the measured grounding resistance value, the true grounding resistance value of the conductive concrete retaining wall is calculated, improving the accuracy and reliability of grounding resistance measurement and providing a scientific basis for the performance evaluation of conductive concrete retaining walls.

[0051] It has the following technical effects: (1) Significantly improved measurement accuracy: By establishing a special four-pole method model for conductive concrete retaining wall structure and introducing equivalent resistivity and geometric correction factor, the distortion effect of the retaining wall body on the electric field is effectively eliminated, making the measurement results closer to the real grounding resistance, and the accuracy is improved by more than 30% compared with the traditional method.

[0052] (2) Strong engineering applicability: This method does not require excavation or damage to the existing grounding structure, and realizes convenient and non-destructive measurement of the grounding resistance of the existing conductive concrete retaining wall, which greatly reduces the operation and maintenance costs and operational risks.

[0053] (3) Guiding design and optimization: Accurate measurement results provide a reliable basis for evaluating the grounding effect of conductive concrete retaining wall, and can guide the mix design of conductive concrete and the optimization of retaining wall structure, thereby improving the scientific and economical nature of engineering design.

[0054] (4) Standardization and repeatability: This method clarifies the electrode arrangement rules and calculation process, forms standardized operation instructions, reduces human interference, and ensures the repeatability and comparability of measurement results.

[0055] According to another aspect of the invention, Figure 4 This is a schematic diagram illustrating a grounding resistance measurement terminal for conductive concrete retaining walls according to an embodiment of the present invention. The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the various steps of the grounding resistance measurement method for conductive concrete retaining walls as described above.

[0056] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for measuring the grounding resistance of conductive concrete retaining walls, characterized in that, Including the following steps: The geometric parameters of the conductive concrete retaining wall and the resistivity of the conductive concrete were measured, and the resistivity of the soil in the preset area was also measured. The grounding resistance of the conductive concrete retaining wall was measured using a grounding resistance tester. The equivalent resistivity is calculated based on the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall, and the resistivity of the conductive concrete. The grounding resistance correction factor is calculated based on the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall, and the equivalent resistivity. The true grounding resistance value of the conductive concrete retaining wall is calculated based on the grounding resistance correction factor and the measured grounding resistance value.

2. The method for measuring the grounding resistance of conductive concrete retaining wall according to claim 1, characterized in that, Measuring the geometric parameters of the conductive concrete retaining wall and the resistivity of the conductive concrete, while simultaneously measuring the resistivity of the soil in a predetermined area, including: Record the geometric parameters of the conductive concrete retaining wall obtained from the survey, and obtain the resistivity of the conductive concrete measured using the four-probe method or the core sampling method. The resistivity of the soil in a preset area is obtained by measuring the resistivity using the Winner quadrupole method. The preset area is the area at a first preset distance from the conductive concrete retaining wall.

3. The method for measuring the grounding resistance of conductive concrete retaining wall according to claim 1, characterized in that, The grounding resistance of the conductive concrete retaining wall is measured using a grounding resistance tester, and the process includes: The electrodes of the grounding resistance tester are arranged, and the grounding resistance tester includes a grounding lead connection point, a current electrode, a first voltage electrode, and a second voltage electrode. The grounding down conductor connection point is connected to the grounding down conductor of the conductive concrete retaining wall, and the current electrode is set at a second preset distance from the center of the conductive concrete retaining wall. The first voltage electrode is located on the line connecting the current electrode and the center of the conductive concrete retaining wall, and the distance between the first voltage electrode and the center of the conductive concrete retaining wall is less than the second preset distance; The second voltage electrode is located in the direction perpendicular to the connecting line, and the distance between the second voltage electrode and the center of the conductive concrete retaining wall is equal to the distance between the first voltage electrode and the center of the conductive concrete retaining wall.

4. The method for measuring the grounding resistance of conductive concrete retaining wall according to claim 3, characterized in that, The grounding resistance of the conductive concrete retaining wall is measured using a grounding resistance tester, including: The grounding resistance tester is used to verify the correctness of the electrode layout, and the grounding resistance measurement value of the conductive concrete retaining wall is obtained using the verified grounding resistance tester.

5. The method for measuring the grounding resistance of conductive concrete retaining wall according to claim 4, characterized in that, The electrode layout of the grounding resistance tester is verified, including: Start the grounding resistance tester and calculate the first grounding resistance value based on the measured current value and the potential difference between the first voltage electrode; Switch the voltage pole of the grounding resistance tester to the second voltage pole, and calculate the second grounding resistance value based on the potential difference between the measured current value and the second voltage pole. Calculate the absolute difference between the first grounding resistance value and the second grounding resistance value. If the ratio of the absolute difference to the first grounding resistance value is less than a preset threshold, it is determined that the electrode layout of the grounding resistance tester is correct. Otherwise, adjust the positions of the first voltage electrode and the second voltage electrode, restart the grounding resistance tester for measurement, until the electrode layout of the grounding resistance tester is correct.

6. The method for measuring the grounding resistance of conductive concrete retaining wall according to claim 1, characterized in that, The equivalent resistivity is calculated based on the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall, and the resistivity of the conductive concrete, including: The equivalent cross-sectional area and equivalent soil cross-sectional area of ​​the conductive concrete retaining wall are calculated based on the geometric parameters of the conductive concrete retaining wall. Based on the soil resistivity ρ s The equivalent cross-sectional area A of the conductive concrete retaining wall c Equivalent soil cross-sectional area A s and the resistivity ρ of the conductive concrete c Calculate the equivalent resistivity ρ eq : 。 7. The method for measuring the grounding resistance of conductive concrete retaining wall according to claim 6, characterized in that, The calculation of the equivalent soil cross-sectional area includes: An empirical coefficient is established based on the soil mass and the density of the conductive concrete retaining wall. The equivalent soil cross-sectional area A is calculated based on the empirical coefficient and the equivalent cross-sectional area of ​​the conductive concrete retaining wall. s : A s =k·A c ; In the formula, k represents the empirical coefficient.

8. The method for measuring the grounding resistance of conductive concrete retaining wall according to claim 1, characterized in that, The grounding resistance correction factor is calculated based on the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall, and the equivalent resistivity, including: The grounding resistance correction factor is calculated based on the resistivity of the soil, the geometric parameters of the conductive concrete retaining wall, and the equivalent resistivity: ； In the formula, K represents the grounding resistance correction factor; α represents the shape correlation coefficient of the conductive concrete retaining wall; ρ eq Represents the equivalent resistivity; ρ s t represents the resistivity of the soil; t represents the average thickness of the conductive concrete retaining wall; L represents the equivalent diameter or diagonal length of the conductive concrete retaining wall.

9. A method for measuring the grounding resistance of conductive concrete retaining walls according to claim 1, characterized in that, The true grounding resistance value of the conductive concrete retaining wall is calculated based on the grounding resistance correction factor and the measured grounding resistance value, including: Substituting the grounding resistance correction factor and the measured grounding resistance value into the formula, the true grounding resistance value of the conductive concrete retaining wall is calculated. The formula is: R true =K·R m ; In the formula, R true This represents the true value of the grounding resistance of the conductive concrete retaining wall; K represents the grounding resistance correction factor; R m This indicates the measured value of the grounding resistance obtained by the grounding resistance tester.

10. A grounding resistance measuring terminal for conductive concrete retaining walls, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements each step of the method for measuring the grounding resistance of conductive concrete retaining wall as described in any one of claims 1 to 9.

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