A potential measurement system using existing supply and extraction separation

Abstract

The application discloses a kind of to utilize existing power supply piezometer power supply and extraction separation potential measurement system, comprising: existing power supply piezometer, electrode system and potential acquisition control subsystem;Existing power supply piezometer is used to inject stable current field in the dam body to be measured;Electrode system includes: power supply electrode system, measurement electrode system and public electrode system;Power supply electrode system is used to connect existing power supply piezometer, forms stable current field;Measurement electrode system is used to measure the stable current field formed by any existing power supply piezometer and power supply electrode system;Public electrode system is used to connect with measurement electrode system, constitutes potential measurement loop;Potential acquisition control subsystem is internally provided with power supply and extraction separation potential collector, for emitting current and back extraction potential data body, and determine the spatial distribution of leakage hidden danger in the dam to be measured.The system can effectively reduce the influence of piezometer metal material on the propagation of electric field inside dam, so as to improve the precision of reservoir dam leakage hidden danger diagnosis in complex site.

Description

Technical Field

[0001] This invention relates to the field of health diagnosis technology for hydraulic structures, and in particular to a power supply and sampling separation potential measurement system that utilizes existing power supply pressure measuring tubes. Background Technology

[0002] Leakage in earth-rock dams is a significant hidden danger threatening the safe operation of reservoir dams. Currently, the main methods for locating leakage channels are drilling, geophysical exploration, and water chemistry. However, each of these individual detection methods has its own advantages and disadvantages. Among them, the branch resistivity method of geophysical exploration, due to its high sensitivity to water bodies, has unique advantages in locating the range, depth, and spatial combination of leakage in reservoir dams. It has achieved numerous successful cases in practical applications and can be considered the mainstream technology for reservoir dam leakage detection.

[0003] However, current resistivity detection methods mainly employ ground-based power supply and data acquisition systems. Because the ground electrode measuring points are far from the potential leakage sites, and the current field is constrained by the spatial volume effect of the geological body during propagation, the accuracy of resistivity methods in identifying potential hazards is somewhat low. Furthermore, with the orderly advancement of water conservancy standardization, various monitoring facilities inside dams are constantly being improved. Metal structures such as piezometers and permeameters inevitably have an adverse effect on the propagation of the electric field, resulting in measured resistivity data containing certain noise signals. Incorrect information may lead to misjudgments or incorrect identification of potential hazard areas.

[0004] Currently, most achievements and technologies focus on changing ground-based observation methods to avoid metal interference. However, in actual data acquisition, the noise from metal media such as pressure gauges cannot be eliminated by changing the observation system. Furthermore, the continuous trial of various ground-based observation methods has reduced the efficiency of geophysical exploration and caused certain economic losses.

[0005] On the other hand, some scholars have proposed methods with low sensitivity to metals for detecting potential leaks, such as the elastic wave method. However, these methods suffer from low accuracy and numerous inconsistencies in identifying the spatial location of leak channels in reservoirs and dams. Furthermore, limitations in objective technology and the immaturity of piezometer noise correction methods mean that practical applications can only rely on conventional resistivity methods for processing and analysis, which clearly cannot achieve precise location and causal analysis of leak targets.

[0006] Invention patent CN110702587B discloses a method for diagnosing seepage in earth-rock dams based on Winner-Nur joint inversion. It improves the data acquisition mode of resistivity method and realizes the synchronous acquisition of Winner-Nur joint (Winner quadrupole device, Winner dipole device, Winner differential device) data volume, which improves the efficiency of on-site work and the effective utilization rate of data. However, the data volume involved in the calculation mainly comes from ground measurement and does not involve the use of geoelectric information measured underground. At the same time, it does not take into account the influence of the piezometer inside the dam body on the propagation of electric field signal.

[0007] Therefore, based on existing technologies for detecting potential seepage hazards in reservoir dams, how to provide an observation system that can avoid the influence of piezometers on resistivity in order to improve the accuracy of identifying potential seepage hazards in reservoir dams has become an urgent problem to be solved by researchers in this field. Summary of the Invention

[0008] In view of the above problems, the present invention proposes a power supply and sampling separation potential measurement system that at least solves some of the above technical problems. This system can effectively reduce the influence of the metal material of the pressure measuring tube on the propagation of the electric field inside the dam, thereby improving the accuracy of diagnosis of leakage hazards in reservoir dams in complex sites.

[0009] This invention provides a power supply and acquisition separation potential measurement system utilizing an existing power supply voltage measuring tube, comprising: an existing power supply voltage measuring tube, an electrode system, and a potential acquisition and control subsystem;

[0010] The existing power supply voltage measuring tube is used to inject a stable current field into the dam body to be measured.

[0011] The electrode system includes: a power supply electrode system, a measuring electrode system, and a common electrode system; the power supply electrode system is used to connect the existing power supply voltage measuring tube to form a stable current field; the measuring electrode system is used to measure the stable current field formed by any of the existing power supply voltage measuring tubes and the power supply electrode system; the common electrode system is used to connect with the measuring electrode system to form a potential measurement circuit.

[0012] The potential acquisition and control subsystem is equipped with a supply and acquisition separation potential acquisition unit, which is used to transmit current and collect potential data, and to determine the spatial distribution of potential leakage hazards in the dam to be measured.

[0013] Furthermore, the power supply electrode system is composed of multiple power supply electrodes and multi-core power supply wires; the multi-core power supply wires are connected to the multiple power supply electrodes in a first numbered sequence.

[0014] Furthermore, the multiple power supply electrodes are used to establish a connection with the existing power supply voltage measuring tube to form a power supply circuit and establish an anisotropic point-to-line power electric field;

[0015] The multi-core power supply conductor is connected to the power supply and acquisition separation potential acquisition device.

[0016] Furthermore, the measuring electrode system is composed of multiple measuring electrodes and multi-core measuring wires; the multi-core measuring wires are connected to the multiple measuring electrodes in a second numbered sequence;

[0017] The multi-channel measurement electrodes employ an independent acquisition mode to synchronously acquire full-field potential data under the same heterogeneous point-to-line power supply electric field.

[0018] Furthermore, the multi-channel measuring electrodes are also used to acquire the potential values ​​of the natural electric field, primary field, and secondary field formed by the point-to-line power source electric field inside the dam to be measured.

[0019] Furthermore, the multi-core power supply conductor and the multi-core measuring conductor are integrated into a single unit to form a test cable, and the numbering at the same position is consistent;

[0020] The test cable is connected to the test-sampling potential acquisition device via a test-sampling connector;

[0021] The existing power supply voltage measuring tube is connected to the power supply and sampling potential acquisition device via an armored electrical wire and a power supply connector.

[0022] Furthermore, the potential acquisition and control subsystem includes: a supply-and-acquisition potential acquisition unit, a transmission unit, and a control processing platform;

[0023] The supply and acquisition separation potential acquisition device is used to transmit current and recover potential data.

[0024] The transmission unit is used to upload the potential data and to issue instructions from the control processing platform to the supply-sampling potential acquisition unit.

[0025] The control and processing platform is used to control the acquisition parameters and recovery parameters of the supply and acquisition separation potential acquisition device, as well as to compile the potential data and perform in-depth processing.

[0026] Furthermore, the power supply and sampling separation potential acquisition device is used to send a positive current signal to the existing power supply voltage measuring tube and a negative current signal to the multi-channel power supply electrode respectively after receiving the instruction;

[0027] The existing power supply voltage measuring tube is used to inject positive current into the dam to be measured according to the positive current signal;

[0028] The multiple power supply electrodes are used to inject negative current into the dam to be measured according to the negative current signal.

[0029] Furthermore, the control processing platform consists of a potential acquisition module and a data processing module;

[0030] The potential acquisition module is used to set the power supply current intensity, power supply time, potential sampling interval, power supply pulse signal, and data feedback method of the dam to be measured.

[0031] The data processing module is used to analyze the potential difference formed between the existing power supply voltage measuring tube and the power supply electrode system.

[0032] Furthermore, the data processing module uses the finite element method to reconstruct the data volume of the anisotropic point-line power source electric field to obtain the spatial distribution of the potential leakage in the dam to be measured.

[0033] This invention also provides a method for measuring the power supply separation potential using an existing power supply voltage sensing tube, comprising:

[0034] Obtain the leakage hazard characteristics of the dam to be measured and the spatial location information of the existing power supply pressure measuring pipes; the spatial location information includes the quantity, planar location, and spatial distribution;

[0035] The existing power supply voltage measuring tube is connected to the power supply and sampling separation potential acquisition device via a power supply connector through an armored electrical conductor;

[0036] Multiple power supply electrodes and multiple measurement electrodes are deployed on the top of the dam to be measured;

[0037] Connect the multi-core power supply wires to the multi-channel power supply electrodes in the first numbering order; connect the multi-core measurement wires to the multi-channel measurement electrodes in the second numbering order to generate the power supply electrode system and the measurement electrode system respectively.

[0038] Establish a connection between the common electrode system and the measuring electrode system;

[0039] The supply and extraction separation potential acquisition device and the control processing platform are turned on, and a connection is established between the supply and extraction separation potential acquisition device and the control processing platform through the self-organizing network signal in the transmission unit.

[0040] Power supply and data acquisition commands are input through the control and processing platform;

[0041] According to a certain network protocol, the power supply and acquisition instructions are transmitted to the power supply and acquisition separation potential acquisition device via the transmission unit; after receiving the instructions, the power supply and acquisition separation potential acquisition device sends a positive current signal to the existing power supply voltage measuring tube and a negative current signal to any power supply electrode in the power supply electrode system.

[0042] Potential difference data under the electric field of anisotropic point-to-line power source were collected;

[0043] When all the power supply electrodes in the power supply electrode system are powered by the existing power supply voltage measuring tube, the power supply and sampling separation potential acquisition device stops sampling and uploads the measured power supply current and potential difference data to the potential acquisition module.

[0044] The data processing module on the control and processing platform organizes the data volume of the heterogeneous point-to-line power supply electric field, and performs electric field analysis on the number, planar position and spatial distribution of the existing power supply pressure measuring tubes to identify the location and shape of the leakage hazard of the dam to be measured.

[0045] Furthermore, the acquisition of potential difference data under the electric field of anisotropic point-to-line power sources includes:

[0046] The propagation current between the existing power supply voltage measuring tube and the power supply electrode is measured, and the potential data generated synchronously by the multi-channel measuring electrode and the common electrode system are measured respectively; the difference between the potential of the multi-channel measuring electrode and the potential of the common electrode system is recorded as the potential difference under the electric field of the heterogeneous point-line power supply.

[0047] Furthermore, after completing the acquisition of a set of potential difference data under the electric field of anisotropic point-to-line power supply, the power supply and acquisition separation potential acquisition device automatically switches multiple measurement electrodes.

[0048] Select any of the remaining electrodes from the multi-channel measurement electrodes to form a current loop with the existing power supply voltage measuring tube, and continue to collect potential data under the full electric field; the potential data under the full electric field consists of the propagation current between the existing power supply voltage measuring tube and the power supply electrode, and the potential data generated synchronously by the multi-channel measurement electrodes and the common electrode system.

[0049] The difference between the potential of the multichannel measuring electrodes and the potential of the common electrode system is denoted as the potential difference of the multichannel measuring electrodes under the propagation current.

[0050] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0051] This invention provides a supply-and-collection separation potential measurement system utilizing an existing power supply piezometer, comprising: an existing power supply piezometer, an electrode system, and a potential acquisition and control subsystem. The existing power supply piezometer is used to inject a stable current field into the dam body to be measured. The electrode system includes: a power supply electrode system, a measurement electrode system, and a common electrode system. The power supply electrode system is used to connect to the existing power supply piezometer to form a stable current field. The measurement electrode system is used to measure the stable current field formed by any existing power supply piezometer and the power supply electrode system. The common electrode system is used to connect with the measurement electrode system to form a potential measurement loop. The potential acquisition and control subsystem is equipped with a supply-and-collection separation potential acquisition unit for transmitting current and collecting potential data, and determining the spatial distribution of potential leakage hazards in the dam to be measured. This system can effectively reduce the influence of the piezometer's metal material on the propagation of the electric field inside the dam, thereby improving the accuracy of diagnosing potential leakage hazards in complex site reservoir dams.

[0052] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0053] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0054] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0055] Figure 1 A planar layout diagram of the existing power supply voltage measuring tube and electrode system provided for embodiments of the present invention;

[0056] Figure 2 A schematic diagram of a reservoir dam seepage detection system powered by a pressure measuring tube provided in an embodiment of the present invention;

[0057] Figure 3 A cross-sectional view of an existing pressure measuring tube provided in an embodiment of the present invention;

[0058] Figure 4 This is a potential contour map of a uniform dam under power supply current provided in an embodiment of the present invention;

[0059] Figure 5 This is an example of a potential potential contour map of a dam with leakage risks provided in an embodiment of the present invention.

[0060] Figure 6 A cloud map containing an abnormal relative background field is provided for an embodiment of the present invention;

[0061] Figure 7 The natural potential curve provided in this embodiment of the invention shows the placement of electrode 1 on three voltage measuring tubes.

[0062] Figure 8 The primary field attenuation curves of different existing pressure measuring tubes provided in the embodiments of the present invention;

[0063] In the attached diagram: 1—Existing power supply piezometer; 2—Buried borehole; 3—Anomaly; 4—Dam crest; 5—Upstream dam slope; 6—Downstream dam slope; 7—First-level walkway; 8—Electrode system; 8-1—Power supply electrode system; 8-2—Measuring electrode system; 8-3—Common electrode system electrode; 9—Multi-core measuring conductor; 10—Power supply cable; 11—Multi-core power supply conductor; 12—Power supply aerial connector; 13—Armored conductor; 14—Power supply aerial connector; 15—Power supply and acquisition potential acquisition device; 16—Conductor; 17—Control and processing platform; 18—Transmission unit; 19—Electric field line. Detailed Implementation

[0064] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0065] This invention provides a power supply and acquisition separation potential measurement system utilizing an existing power supply voltage measuring tube, comprising: an existing power supply voltage measuring tube, an electrode system, and a potential acquisition and control subsystem;

[0066] The existing power supply voltage measuring tube is used to inject a stable current field into the dam body to be measured.

[0067] The electrode system includes: a power supply electrode system, a measuring electrode system, and a common electrode system; the power supply electrode system is used to connect existing power supply voltage measuring tubes to form a stable current field; the measuring electrode system is used to measure the stable current field formed by any existing power supply voltage measuring tube and the power supply electrode system; the common electrode system is used to connect with the measuring electrode system to form a potential measurement circuit.

[0068] The potential acquisition and control subsystem is equipped with a supply and acquisition separation potential acquisition unit, which is used to transmit current and collect potential data, and to determine the spatial distribution of potential leakage hazards in the dam to be measured.

[0069] This power supply and sampling separation potential measurement system utilizes existing power supply piezometers as a line current source on the reservoir dam. Power is manually supplied to the piezometers to establish a stable current field inside the dam. Based on the observed potential distribution characteristics at different locations on the dam crest, potential leakage zones can be identified. This system effectively reduces the influence of the piezometer's metal material on the propagation of the electric field inside the dam, thereby improving the accuracy of leakage detection in complex reservoir dam sites.

[0070] This embodiment involves deploying a shared measuring electrode system on the top of the reservoir dam, using the existing piezometer on the dam as a power supply line to supply power to the underground, thereby establishing a reservoir seepage line power potential observation system that connects the piezometer and the power supply electrode system to the measuring electrode system. Based on the measured potential magnitude and location at different positions on the dam top, the spatial location of potential seepage hazards can be determined.

[0071] The following is a detailed description of the power supply and sampling separation potential measurement system provided in this embodiment, which utilizes an existing power supply voltage measuring tube:

[0072] The power supply and acquisition separation potential measurement system mainly includes the existing power supply voltage measuring tube, electrode system and potential acquisition and control subsystem.

[0073] The existing power supply pressure measuring pipe refers to the existing tin-plated steel pipe used to measure the water level inside the dam body. Preferably, there are no fewer than three existing power supply pressure measuring pipes. In this embodiment, the existing power supply pressure measuring pipe also serves to inject a stable current field into the dam body. Specifically, the existing power supply pressure measuring pipe injects a positive current into the dam body. The current supplied to the ground by the existing power supply pressure measuring pipe is no less than 1A. The existing power supply pressure measuring pipe is connected to the power supply and sampling potential acquisition device via armored wires and a power supply connector.

[0074] The electrode system includes the measuring electrode system, the power supply electrode system, and the common electrode system.

[0075] The power supply electrode system is located on the top of the dam. It consists of multiple power supply electrodes and multi-core power supply conductors. The electrodes are made of stainless steel and inject negative current into the dam. The multi-core power supply conductors are numbered one-to-one with the electrodes.

[0076] The existing power supply voltmeter and any number of power supply electrodes in the power supply electrode system can each independently form a power supply circuit, thereby establishing an anisotropic point-to-line power electric field inside the dam. The multiple power supply electrodes in the power supply electrode system are freely switched according to instructions via a switch in the power supply and acquisition separation potential acquisition device, thus enabling each of the multiple power supply electrodes to establish an anisotropic point-to-line power electric field with the existing power supply voltmeter. Optionally, the current supplied to the ground by the multiple power supply electrodes is not less than 0.25A.

[0077] The measuring electrode system is located at the top of the dam and includes multiple measuring electrodes and multi-core measuring leads. The multiple measuring electrodes are non-polarized and are used to measure the full-field potential data. The multi-core measuring leads are numbered one-to-one with the multiple measuring electrodes. Specifically, the measuring electrode system can measure the stable current field formed by any existing power supply voltmeter and multiple power supply electrodes. The multi-core power supply leads and multi-core measuring leads are integrated into a single power supply cable, and their numbers are consistent at the same locations.

[0078] Any multiple measuring electrodes in the measuring electrode system can independently and synchronously acquire the potential values ​​of the natural electric field, primary field, and secondary field formed by the point-to-line power source electric field inside the dam. The multiple measuring electrodes in the measuring electrode system adopt an independent acquisition mode to achieve synchronous acquisition of full-field potential data under the same heterogeneous point-to-line power source electric field.

[0079] Specifically, the multiple power supply electrodes and multiple measurement electrodes are fully coupled to the dam soil. The number of power supply electrodes and multiple measurement electrodes is the same, and the distance between adjacent power supply electrodes and multiple measurement electrodes is less than 5 meters. The power supply electrodes and multiple measurement electrodes are located on opposite sides of the power supply cable. The distance between power supply electrodes and multiple measurement electrodes at the same location is within 10 centimeters.

[0080] The common electrode system has only one non-polarized electrode, and the non-polarized electrode is located in a region with low electromagnetic noise. The common electrode system and the measuring electrode system form a potential measurement loop, which is used as a reference for the potential of the measuring electrode system.

[0081] This embodiment involves arranging multiple power supply electrodes, multiple measurement electrodes, and a common electrode system on the top of the dam, connecting the power supply and sampling potential acquisition device to the measurement electrode system, power supply electrode system, and common electrode system, and connecting the power supply and sampling potential acquisition device to the control and processing platform through a transmission unit, thereby forming an observation system for the electric field of anisotropic point-to-line power sources.

[0082] Furthermore, the potential acquisition and control subsystem includes a supply-and-acquisition potential acquisition unit, a transmission unit, and a control processing platform.

[0083] The supply-and-collection potential acquisition unit is used to transmit current and collect potential data. The transmission unit is used to upload the data collected by the supply-and-collection potential acquisition unit and also to issue instructions from the control processing platform to the supply-and-collection potential acquisition unit. The control processing platform is used to control the acquisition and collection parameters of the supply-and-collection potential acquisition unit, and also to organize and process the collected potential data.

[0084] Specifically, the control and processing platform has a built-in potential acquisition module and a data processing module. The potential acquisition module can be set with power supply current intensity, power supply time, potential sampling interval, power supply pulse signal, and data feedback method.

[0085] The data processing module includes the compilation of data volumes, which are classified according to different existing power supply voltage measuring tubes and different power supply electrodes, thereby forming current I and potential U types of multi-channel measuring electrodes.

[0086] Measured current I m,n Notation:

[0087] Where m refers to the number of existing power supply voltage measuring tubes, and n refers to the number of multi-channel power supply electrodes.

[0088] Measured potential difference Notation:

[0089] Where k represents the number of multichannel measurement electrodes.

[0090] The data processing module supports the analysis of the potential difference formed by a set of existing power supply voltammetric tubes and power supply electrode systems. Specifically, it displays the electric field distribution formed by the power supply and measurement electrode systems through a potential difference change cloud map. When there are no anomalies inside the dam, the measured potential equipotential lines are uniformly distributed around the existing power supply voltammetric tubes, and the contour lines are relatively smooth, with the potential values ​​being basically consistent across the entire area. When a low-resistivity anomaly exists inside the dam, the presence of the low-resistivity anomaly disrupts the uniform distribution of the potential equipotential lines, causing the measured potential equipotential lines to converge towards the interior of the anomaly, exhibiting a low potential characteristic in that area.

[0091] Furthermore, the data processing module supports planar intelligent identification and analysis of potential differences formed by multiple existing power supply voltage measuring tubes and power supply electrodes. When all existing power supply voltage measuring tubes are located on the same plane, deep learning can be used to establish a potential difference change cloud map of different abnormal fields and establish an anomaly identification model. The identification model can be used to quickly identify and locate the spatial position of the anomaly in multiple sets of potential difference data.

[0092] The data processing module supports the three-dimensional inversion of the potential difference formed by all existing power supply piezometers and power supply electrodes on the dam. It records the existing power supply piezometers, measuring electrode systems, and power supply electrode systems according to their actual coordinate positions, and arranges the measured current and voltage according to the power supply and measurement numbers. It uses the finite element algorithm to reconstruct the model of the data volume of the anisotropic point-line power source electric field, thereby obtaining the spatial distribution of leakage hazards in the dam.

[0093] This invention also provides a method for measuring the supply-sampling separation potential using an existing power supply voltage sensing tube, comprising:

[0094] Obtain the characteristics of potential leakage hazards in the dam to be measured and the spatial location information of existing power supply pressure measuring pipes; the spatial location information includes the quantity, planar location, and spatial distribution;

[0095] The existing power supply voltage measuring tube is connected to the power supply and sampling separation potential acquisition device via a power supply connector through armored electrical wires;

[0096] Multiple power supply electrodes and multiple measurement electrodes are deployed on the top of the dam to be measured;

[0097] Connect the multi-core power supply wires to the multi-channel power supply electrodes in the first numbering order; connect the multi-core measurement wires to the multi-channel measurement electrodes in the second numbering order to generate the power supply electrode system and the measurement electrode system respectively.

[0098] Establish a connection between the common electrode system and the measuring electrode system;

[0099] Turn on the supply and extraction separation potential acquisition device and control processing platform, and establish a connection between the supply and extraction separation potential acquisition device and control processing platform through the self-organizing network signal in the transmission unit;

[0100] Power supply and data acquisition commands are input through the control processing platform;

[0101] According to a certain network protocol, the power supply and acquisition instructions are transmitted to the power supply and acquisition separation potential acquisition unit via the transmission unit; after receiving the instructions, the power supply and acquisition separation potential acquisition unit sends a positive current signal to the existing power supply voltage measuring tube and a negative current signal to any power supply electrode in the power supply electrode system.

[0102] Potential difference data under the electric field of anisotropic point-to-line power supply were collected;

[0103] Once all power supply electrodes in the power supply electrode system are powered by the existing power supply voltage measuring tube, the power supply and sampling separation potential acquisition unit stops sampling and uploads the measured power supply current and potential difference data to the potential acquisition module.

[0104] The data processing module on the control and processing platform organizes the data volume of the anisotropic point-to-line power supply electric field, and performs electric field analysis based on the number, planar position and spatial distribution of the existing power supply voltage measuring tubes to identify the location and shape of the leakage hazard of the dam to be measured.

[0105] Furthermore, potential difference data under the electric field of anisotropic point-to-line power sources are collected, including:

[0106] The propagation current between the existing power supply voltage measuring tube and the power supply electrode is measured, and the potential data generated synchronously by the multi-channel measuring electrode and the common electrode system are measured respectively. The difference between the potential of the multi-channel measuring electrode and the potential of the common electrode system is recorded as the potential difference under the electric field of the heterogeneous point-line power supply.

[0107] Furthermore, after collecting a set of potential difference data under the electric field of anisotropic point-to-line power supply, the power supply and acquisition separation potential acquisition unit automatically switches multiple measurement electrodes.

[0108] Select any of the remaining electrodes from the multi-channel measurement electrodes to form a current loop with the existing power supply voltage measuring tube, and continue to collect potential data under the full electric field; the potential data under the full electric field consists of the propagation current between the existing power supply voltage measuring tube and the power supply electrode, and the potential data generated synchronously by the multi-channel measurement electrodes and the common electrode system.

[0109] The difference between the potential of the multichannel measuring electrodes and the potential of the common electrode system is denoted as the potential difference of the multichannel measuring electrodes under propagation current.

[0110] The specific implementation steps for reservoir dam seepage detection methods are as follows:

[0111] (1) Collect and investigate relevant data on the characteristics of seepage hazards in reservoir dams and the spatial location information of existing power supply piezometers, so as to determine the key target area of ​​the dam that urgently needs to be monitored, and give the spatial plane coordinates and depth of the piezometers;

[0112] (2) Without affecting the seepage monitoring pressure pipe's continued function of monitoring the internal leakage status of the dam, the existing power supply pressure pipe is connected to the power supply and acquisition separation potential collector via a power supply connector using armored wires, so that the existing power supply pressure pipe can become an existing power supply pressure pipe that can supply power to the ground.

[0113] (3) Multiple power supply electrodes and multiple measurement electrodes are installed on the top of the dam. The multi-core power supply wires are connected to the multiple power supply electrodes in the first number sequence, and the multi-core measurement wires are connected to the multiple measurement electrodes in the second number sequence. The multi-core power supply wires and the multi-core measurement wires are integrated to form a power supply and measurement cable and connected to the power supply and measurement separation potential acquisition device through the power supply and measurement connector.

[0114] (4) Activate the power supply and acquisition separation potential acquisition device and the control processing platform, and connect the power supply and acquisition separation potential acquisition device and the control processing platform through the self-organizing network signal in the transmission unit. During acquisition, set the power supply current intensity, power supply time, potential sampling interval, power supply pulse signal and data feedback mode on the control processing platform. According to a certain network protocol, the power supply and acquisition instructions are transmitted to the power supply and acquisition separation potential acquisition device through the transmission unit. After receiving the instructions, the power supply and acquisition separation potential acquisition device sends a positive current signal to the existing power supply voltage measuring tube and a negative current signal to any power supply electrode in the power supply electrode system, so that the positive and negative currents form a stable current path inside the dam. During this process, the propagation current between the existing power supply voltage measuring tube and the power supply electrode is measured, and the potential data under the full electric field is simultaneously collected by the multi-channel measuring electrodes and the common electrode system in the electrode system. The difference between the potential of the multi-channel measuring electrodes and the potential of the common electrode system is recorded as the potential difference of the multi-channel measuring electrodes under the propagation current.

[0115] (5) After completing the acquisition of a set of potential difference data under the electric field of a heterogeneous point-to-line power supply, the power supply and acquisition separation potential acquisition device automatically switches multiple measurement electrodes, thereby selecting any of the remaining electrodes to form a current loop with the existing power supply voltage measuring tube, and continues to acquire and measure the propagation current between the existing power supply voltage measuring tube and the power supply electrode, as well as the potential data under the whole electric field synchronously acquired by the multiple measurement electrodes and the common electrode system in the measurement electrode system, and the difference between the potential of the multiple measurement electrodes and the potential of the common electrode system is recorded as the potential difference of the multiple measurement electrodes under the propagation current.

[0116] (6) When all the power supply electrodes in the power supply electrode system on the measuring line are powered by the existing power supply voltage measuring tube, the power supply and sampling separation potential acquisition unit stops sampling and uploads the measured power supply current and potential difference data to the potential acquisition module.

[0117] (7) When there are multiple existing power supply pressure measuring tubes on the dam, replace the existing power supply pressure measuring tubes and form a power supply circuit with the power supply electrode system, and repeat steps (4), (5), and (6) to collect data.

[0118] (8) The data processing module on the control processing platform organizes the data and performs electric field analysis on the number, planar position and spatial distribution of the existing power supply voltage measuring tubes, thereby identifying the location and form of the hidden danger.

[0119] The following two specific practical application examples illustrate the supply-sampling separation potential measurement system and method using existing power supply voltage measuring tubes provided in this embodiment:

[0120] Reference Figure 1 and Figure 2 As shown, Figure 1It is a planar layout diagram of the existing power supply pressure measuring tubes and electrode system; the power supply electrode system 8-1 and the measuring electrode system 8-2 are arranged in the electrode system 8 on the top of the dam. Figure 2 This is a schematic diagram of a reservoir dam seepage detection system powered by a pressure testing tube. Electrode system 8 is deployed on the dam crest. Power supply electrode system 8-1 is connected via multi-core power supply wire 11, and measurement electrode system 8-21 is connected via multi-core measurement wire 9. They ultimately converge into a power supply cable 10, which is connected to the power supply and measurement separation potential acquisition unit 15 via a power supply connector 12. Existing power supply pressure testing tube 1 is connected to armored wire 13, and then to the power supply and measurement separation potential acquisition unit 15 via a power supply connector 14. Common electrode system electrode 8-3 is connected to the power supply and measurement separation potential acquisition unit 15 via a wire. The power supply and measurement separation potential acquisition unit 15 is wirelessly connected to the control and processing platform 17 via a transmission unit 18.

[0121] Example 1

[0122] A reservoir dam model with a length of 100m and a height of 30m was constructed. The resistivity of the dam body is 300Ω·m, the resistivity of the anomaly is 20Ω·m, the radius of the anomaly is 5m, the center point of the anomaly is 15m from the top of the dam, the anomaly is located to the left of the piezometer and at a distance of 20m, and the power supply current is 1A / m. Figure 3 This is a cross-sectional view of an existing pressure gauge.

[0123] Reference Figure 4 As shown, Figure 4 This is a potential contour map of a uniform dam under the power supply current. As can be seen from the map, the potential contour lines are symmetrically distributed around the existing power supply piezometer. The potential is relatively high near the existing power supply piezometer. As the position of the existing power supply piezometer increases, the potential shows a continuous decreasing trend, but the rate of decrease is continuously decreasing.

[0124] Reference Figure 5 As shown, Figure 5 This is a potential contour map of a dam with potential leakage. There is a low-resistivity anomaly on the left side of the existing power supply piezometer. As can be seen from the figure, the potential contour lines are bent due to the presence of the low-resistivity body, which changes the propagation of the electric field. On the right side of the piezometer, the potential contour lines are basically consistent with the background field, thus proving that the low-resistivity anomaly zone inside the dam can be identified using the existing power supply piezometer.

[0125] Figure 6 yes Figure 5 and Figure 4 The potential ratio diagram clearly shows the existence of a low-resistance region, and its depth is basically consistent with the preset model, verifying the effectiveness of the system and method provided in this embodiment.

[0126] Example 2

[0127] There are three existing power supply piezometers on a reservoir, located at 12m, 39m and 58m respectively. 64 power supply and measurement electrodes are arranged on the top of the dam, with an electrode spacing of 1m. Figure 7 The graph shows the natural potential curves with electrode 1 placed on three pressure measuring tubes. It can be seen from the graph that the influence of electrode 1 on the natural potential is weak at different positions, indicating that the supply-sampling separation potential measurement system is reliable. Figure 8 This is a primary field attenuation curve diagram of different existing pressure measuring tubes.

[0128] The supply-sampling separation potential measurement system and method using existing power supply voltage measuring tubes provided in this embodiment have the following beneficial effects:

[0129] (1) Power is supplied by existing pressure measuring tubes, and there is no need to drill holes to lay new pressure measuring tubes. This realizes the multi-functional comprehensive utilization of pressure measuring tubes. Compared with the borehole resistivity method, it is more economical and will not cause multiple damages to the dam body. Only one electrical resistivity line needs to be laid on the top of the dam, which reduces the workload and greatly improves the work efficiency.

[0130] (2) The innovative use of the piezometer as the line current source of the electrostatic field not only avoids the interference of the piezometer's metal material on conventional resistivity detection, but also makes full use of the piezometer's strong conductivity to improve the intensity of the current field transmission in the deep part of the dam, thereby improving the signal-to-noise ratio of the voltage signal.

[0131] (3) By placing the pressure measuring tube inside the dam body, it is closer to the seepage hazard area than the surface observation system, and expands the coverage of resistivity to the hazard body. Compared with conventional ground resistivity methods, this system and method have the advantages of large detection depth, high detection accuracy, convenient operation and simple interpretation of results.

[0132] (4) Since the piezometer is an important tool for long-term monitoring of seepage in the dam body of a reservoir, the method proposed in this embodiment does not cause any damage to the piezometer and can repeatedly monitor the electric field distribution inside the dam, thus realizing the organic unity of detection and diagnosis and dynamic monitoring.

[0133] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A power supply and sampling separation potential measurement system utilizing existing power supply voltage measuring tubes, characterized in that, include: It includes a power supply voltage measuring tube, an electrode system, and a potential acquisition and control subsystem; The existing power supply voltage measuring tube is used to inject a stable current field into the dam body to be measured. The electrode system includes: a power supply electrode system, a measuring electrode system, and a common electrode system; the power supply electrode system is used to connect the existing power supply voltage measuring tube to form a stable current field; the measuring electrode system is used to measure the stable current field formed by any of the existing power supply voltage measuring tubes and the power supply electrode system; the common electrode system is used to connect with the measuring electrode system to form a potential measurement circuit. The potential acquisition and control subsystem is equipped with a supply and acquisition separation potential acquisition unit, which is used to transmit current and collect potential data, and to determine the spatial distribution of potential leakage hazards in the dam to be measured.

2. The power supply and sampling separation potential measurement system using an existing power supply voltage measuring tube as described in claim 1, characterized in that, The power supply electrode system consists of multiple power supply electrodes and multi-core power supply wires; the multi-core power supply wires are connected to the multiple power supply electrodes in a first numbered sequence.

3. The power supply and sampling separation potential measurement system using an existing power supply voltage measuring tube as described in claim 2, characterized in that, The multiple power supply electrodes are used to establish a connection with the existing power supply voltage measuring tube to form a power supply circuit and establish an anisotropic point-to-line power electric field. The multi-core power supply conductor is connected to the power supply and acquisition separation potential acquisition device.

4. The power supply and sampling separation potential measurement system using an existing power supply voltage measuring tube as described in claim 3, characterized in that, The measuring electrode system consists of multiple measuring electrodes and multi-core measuring wires; the multi-core measuring wires are connected to the multiple measuring electrodes in a second numbered sequence. The multi-channel measurement electrodes employ an independent acquisition mode to synchronously acquire full-field potential data under the same heterogeneous point-to-line power supply electric field.

5. The power supply and sampling separation potential measurement system using an existing power supply voltage measuring tube as described in claim 4, characterized in that, The multi-core power supply conductor and the multi-core measuring conductor are integrated into a single unit to form a test cable, and the numbering at the same position is consistent. The test cable is connected to the test-sampling potential acquisition device via a test-sampling connector; The existing power supply voltage measuring tube is connected to the power supply and sampling potential acquisition device via an armored electrical wire and a power supply connector.

6. The power supply and sampling separation potential measurement system using an existing power supply voltage measuring tube as described in claim 3, characterized in that, The potential acquisition and control subsystem includes: a supply-acquisition separation potential acquisition unit, a transmission unit, and a control processing platform; The supply and acquisition separation potential acquisition device is used to transmit current and recover potential data. The transmission unit is used to upload the potential data and to issue instructions from the control processing platform to the supply-sampling potential acquisition unit. The control and processing platform is used to control the acquisition parameters and recovery parameters of the supply and acquisition separation potential acquisition device, as well as to compile the potential data and perform in-depth processing.

7. The power supply and sampling separation potential measurement system using an existing power supply voltage measuring tube as described in claim 6, characterized in that, The power supply and sampling separation potential acquisition device is used to send a positive current signal to the existing power supply voltage measuring tube and a negative current signal to the multi-channel power supply electrodes respectively after receiving an instruction. The existing power supply voltage measuring tube is used to inject positive current into the dam to be measured according to the positive current signal; The multiple power supply electrodes are used to inject negative current into the dam to be measured according to the negative current signal.

8. A power supply and sampling separation potential measurement system utilizing an existing power supply voltage measuring tube as described in claim 6, characterized in that, The control and processing platform consists of a potential acquisition module and a data processing module. The potential acquisition module is used to set the power supply current intensity, power supply time, potential sampling interval, power supply pulse signal, and data feedback method of the dam to be measured. The data processing module is used to analyze the potential difference formed between the existing power supply voltage measuring tube and the power supply electrode system.

9. A power supply and sampling separation potential measurement system utilizing an existing power supply voltage measuring tube as described in claim 8, characterized in that, The data processing module uses the finite element method to reconstruct the data volume of the anisotropic point-line power source electric field, thereby obtaining the spatial distribution of the potential leakage hazards in the dam to be measured.

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