CN114993910B - A nondestructive detection device for leakage of vertical isolation barrier and use method thereof - Google Patents

Abstract

The invention discloses a nondestructive testing device for leakage of a vertical isolation barrier and a using method thereof, comprising the following steps: the detection device is used for detecting the frame and the positioning device; the detection apparatus includes: the system comprises a high-voltage power supply, an antenna wire frame, an instrument host, a cable, a wifi data transmission module and an operation terminal; the detection frame comprises: the device comprises a main body frame, a telescopic foot rest, universal wheels, a high-voltage power supply bin, an instrument host bin, an antenna wire frame, a guide rail, a wifi module bin and a level gauge; the positioning device includes: a laser positioning instrument and a laser receiver. The detection device has the advantages of simplified detection process, reduced detection error, high detection speed, high practicability, convenient and nondestructive detection method, no need of engineering such as drilling, sensor arrangement and the like, low detection cost, high detection precision and the like.

Description

A nondestructive detection device for leakage of vertical isolation barrier and use method thereof

Technical Field

The present invention belongs to the field of pollution prevention and control, and in particular relates to a nondestructive detection device for leakage of a vertical isolation barrier and a use method thereof.

Background Art

During the construction and operation of industrial enterprises, pollutants have invaded the soil and groundwater of the factory area, which is extremely harmful, so it is necessary to block and control the polluted site. Using the emerging vertical isolation barrier technology to block and control it is the most appropriate way at this stage. Since pollutants in the site are difficult to self-repair, vertical barriers often have a service life of more than ten or even decades. During the service period of the barrier, it often causes damage and leakage under the action of environmental damage and surface loads, causing immeasurable losses. Therefore, the inspection and maintenance of underground vertical isolation barriers is an important prerequisite and guarantee for limiting the migration of pollutants and ensuring the health of life and production around the site.

At present, the main method for monitoring the anti-seepage status of vertical isolation barriers is the borehole monitoring method, that is, by setting up multiple deep pumping wells and observation wells in front of and behind the barrier to conduct pumping tests and tracer tests, and by monitoring the water level changes in the holes to determine the barrier's anti-seepage effect. However, since the barrier is affected by the stratum and site range, the length and depth vary, and it is difficult to fully grasp the barrier's anti-seepage status by using observation well monitoring; at the same time, due to the large depth-to-diameter ratio of the borehole, it is extremely easy to collapse and fail after being disturbed, and long-term monitoring costs are huge; therefore, rapid and non-destructive detection of the anti-seepage status of vertical isolation barriers is a difficulty and pain point that needs to be solved in this field.

Transient electromagnetic method (TEM) is an induction-type time-domain electromagnetic method. It mainly transmits field pulse signals to the underground through an ungrounded coil or grounded electrode, and collects secondary fields from the underground at different times through a receiving coil within a cycle. The distribution of geological media is inferred by analyzing the induced electromotive force signals at different times. This technology has the advantages of no exploration, high detection efficiency, and sensitivity to low resistance. It is widely used in the fields of mine void detection, tunnel advance prediction, and metal mineral exploration. However, a set of mobile instantaneous electromagnetic detection equipment includes coils, power supplies, host computers, and operating terminals. The components are connected by cables. At the same time, in order to prevent the stray current of the host computer, power supply, and operating terminal from affecting the detection signal during operation, four to five people are usually required to operate in coordination. In addition, the ground conditions at industrial contaminated sites are complex, there are many on-site deposits, the detection process consumes a lot of manpower, the process is cumbersome when moving, and long-distance detection is easy to deviate from the detection position by manual positioning, which increases the detection error. Therefore, how to implement appropriate detection devices and methods according to the characteristics of the vertical isolation barrier engineering of the contaminated site has become the key to the problem.

Summary of the invention

In view of the practical problems existing in the above-mentioned existing vertical barrier anti-seepage status monitoring, the present invention discloses a vertical isolation barrier leakage non-destructive detection device and use method to solve them. The invention takes into account that the local soil is rich in water after the vertical barrier leaks, and the leakage area is in a low-resistance state. It combines miniaturized and high-precision transient electromagnetic technology to achieve non-destructive detection of vertical barrier leakage in industrial contaminated sites, reduce monitoring project expenditures and manpower consumption, and improve detection accuracy. The present invention is further elaborated below.

A nondestructive detection device for leakage of a vertical isolation barrier, comprising: a detection device, a detection frame, and a positioning device;

The detection equipment includes: a high-voltage power supply, an antenna wire frame, a transient electromagnetic instrument host, cables, a wifi data transmission module, and an operation terminal, which are used to realize detection control, signal transmission and return, data sending and data processing and other functions; the detection frame includes: a main frame, a telescopic tripod, a universal wheel, a high-voltage power supply compartment, an instrument host compartment, an antenna wire frame placement guide rail, a wifi module compartment, and a level to place the detection equipment, realize quick movement between sites, and perform horizontal adjustment of the detection posture; the positioning equipment is composed of a laser locator and a laser receiver. The laser locator is fixed at the starting end of the detection section and is used to emit laser signals. The laser receiver is fixed at one end of the detection frame and is used to receive laser signals. The combination of the two can realize accurate fixation of the detection trajectory and automatic positioning of the measuring point.

Furthermore, the main frame is composed of an upper and lower rectangular frame, which is fixedly connected by the high-voltage power supply compartment, the instrument host compartment, and the wifi module compartment distributed at the four corners inside the main frame; the antenna wire frame mounting guide rail is arranged in the middle of the main frame for placing the detection equipment; the outer layers of the high-voltage power supply compartment, the instrument host compartment, and the wifi module compartment are all wrapped with a shielding cover to prevent the stray current of the equipment from affecting the connection and signal transmission of the antenna wire frame, thereby improving the detection accuracy; two high-voltage power supply compartments are provided, which are divided into a main power supply compartment and a backup power supply compartment; the telescopic tripod is divided into four, each of which is connected to the four corners of the main frame at the upper end and has a universal wheel installed at the lower end.

Furthermore, the antenna wire frame placement guide rail is composed of two upper and lower circular rings matching the diameter of the antenna wire frame and two sliding damping guide rails built into the upper and lower circular rings. The upper and lower circular rings are fixedly connected to the upper and lower rectangular frames in the main frame through connecting rods respectively. The outside of the antenna wire frame is provided with a guide rail slider through a trapezoidal mortise and tenon structure. The slider cooperates with the guide rail to achieve the ability of the antenna wire frame to slide up and down on the guide rail after being installed on the guide rail. The guide rail slider is connected to the antenna wire frame through a trapezoidal mortise and tenon structure to ensure stability while facilitating disassembly. When testing is required, the signal transmitting end of the antenna wire frame is close to the ground. When the test is completed, the wire frame slides up and off the ground to facilitate the movement of the test frame.

Furthermore, the spirit level is installed on a side connecting rod, close to the antenna wire frame, horizontally upward, and the laser receiver is installed at one end of the main frame, with the receiving end facing forward, toward the laser locator.

Furthermore, the telescopic tripod is a sleeve structure, and the height of the tripod can be adjusted by adjusting the inner tube. By adjusting the heights of the four tripods, the detection device can be in a suitable detection posture in a complex venue; the universal wheel has a locking structure, which can achieve convenient movement of the detection frame and absolute stability during detection.

Furthermore, the antenna wire frame is connected to the high-voltage power supply and the transient electromagnetic instrument host through cables respectively, the transient electromagnetic instrument host is connected to the high-voltage power supply through cables, the wifi data transmission module is connected to the high-voltage power supply through cables, and the transient electromagnetic instrument host is connected to the operation terminal through wifi wireless transmission.

The present invention also provides a method for using the vertical isolation barrier leakage nondestructive detection device, comprising the following steps:

Step S1: Establishment of vertical isolation barrier database of the site

S1-1 Investigate the engineering data of the site, including the site scope, soil layer structure, permeability coefficient of each soil layer, spatial position of the vertical isolation barrier, geometric parameters, location coordinates, and permeability coefficient;

S1-2 Investigate hydrogeological data, including flow direction, flow velocity, and water level in the site;

S1-3 organizes the above survey data into a site vertical isolation barrier database.

Step S2: Arrange the test sections and test points

S2-1: establishing a site numerical model including a vertical isolation barrier based on the site engineering data; assigning values to each entity and boundary in the numerical model based on the hydrogeological data;

S2-2 Carry out numerical simulation to obtain the groundwater flow field distribution of the site with vertical isolation barriers;

S2-3 sets the horizontal distance from the vertical isolation barrier to the highest water level on the rear side of the vertical isolation barrier as the layout range of the isolation barrier detection section;

The rear side of the vertical isolation barrier is the side with low water head in the site flow field. The length of the detection section should not be less than the length of the barrier. Multiple detection sections can be arranged within the arrangement range of the detection section, and the spacing between multiple sections is not greater than 2m.

S2-4 Determine the number of detection points on the detection section according to the accuracy of the selected detection device, and arrange no less than one detection point within the detection accuracy range of the detection device; the detection points should be staggered when there are multiple detection sections.

Step S3: Leakage detection and identification

S3-1 Clean and level the test section to ensure that there are no metal components or areas with clear water within 1m on both sides of the test section line to reduce the noise level during testing;

S3-2: The laser locator is installed at one end of the detection section, and the coordinates are initialized with the installation position of the laser locator as the origin (0, 0), and the coordinates of the detection point position on the detection section are imported into the laser locator; the laser locator emits laser along the detection section to fix the detection track, and the laser receiver receives laser to correct the detection track, and gives a sound reminder when reaching the detection point, so as to realize automatic calibration of the detection point;

S3-3 calibrates the detection parameters of the detection device; during calibration, one person operates the detection frame, connects and turns on the high-voltage power supply, antenna wire frame, transient electromagnetic instrument host, and wifi data transmission module, and one person holds the operation terminal to adjust the parameters;

Furthermore, through field tests, appropriate parameters such as the transmission frequency and superposition period are calibrated. The transmission frequency is between 2.5-200Hz. The deeper the detection depth, the smaller the required transmission frequency. Conversely, the larger the transmission frequency. Generally, when the barrier depth is 5-20m, the frequency is selected as 25Hz, and when the barrier depth is 20-50m, the frequency is selected as 6.25Hz. The number of superpositions is related to the noise level. In practical applications, it can be determined according to the transmission frequency. When the frequency is selected as 25Hz, the number of superpositions is 500 times, and the return signal should be repeatedly observed twice to determine the parameters. When the frequency is selected as 6.25Hz, the number of superpositions is 200 times, and the return signal should be repeatedly observed twice to determine the parameters.

Furthermore, during the test, the operating terminal is kept at a distance of not less than 5m from the antenna wire frame to prevent the terminal from interfering with the detection signal, and during the test, the operating terminal is kept at a distance of not more than 20m from the antenna wire frame to ensure stable data transmission.

S3-4 adjusts the detection posture of the detection device; when adjusting the posture, closes the universal wheel locking mechanism to ensure the stability of the detection frame; the detection frame operator adjusts the telescopic tripod according to the level meter data feedback to make the detection frame in a completely horizontal detection posture, and lowers the antenna wire frame to make the antenna wire frame completely contact the ground; one person holds the operation terminal to carry out the test;

S3-5 starts from the origin and detects the detection points point by point. Step S3-4 needs to be repeated before the detection. During the detection, the calibration parameters described in step S3-3 are used to detect and obtain the detection results such as the induced electromotive force and induced current in the soil. After the detection, the antenna wire frame is raised, the universal wheel locking structure is opened, and the detection is moved along the detection section to the next detection point for detection.

S3-6: using numerical software to invert the detection results of the induced electromotive force, induced current, etc. in the soil in step S3-5 to obtain the resistivity contour map of one or more detection sections;

S3-7 determines the resistivity change position and then the leakage position by comparing the resistivity distribution at different times and spaces; the resistivity change position is the position where the resistivity behind the vertical barrier is lower than the normal value of the surrounding flow field. The change is divided into "isolated island change area" and "connected change area". The leakage degree can be comprehensively judged by combining the change area and the remaining sections, and the spatial coordinates of the resistivity change position are calibrated to determine the leakage position of the underground vertical barrier.

Beneficial Effects

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention integrates high-voltage power supply, transient electromagnetic instrument host, wifi module and other noise-containing devices with the antenna wire frame by setting a shielding device compartment on the detection device, thereby improving the integrity of the equipment, simplifying the detection steps, and reducing the number of testers; by designing a four-corner telescopic tripod and an antenna wire frame placement guide rail, the detection device is more convenient to move, more adaptable to terrain, and more accurate in detection posture; by designing a laser positioning device, the accuracy of the measurement point and the retention of the measurement track are improved. The overall detection process is simplified, the detection error is reduced, the detection speed is accelerated, and the practicability is high, which is very suitable for the underground vertical barrier leakage detection on the site.

(2) The detection device of the present invention utilizes the characteristics of increased local soil moisture content and low local resistance after the underground vertical barrier leaks, and combines miniaturized and high-precision transient electromagnetic technology to realize leakage detection of the underground vertical barrier. The detection method is convenient and non-destructive, and does not require drilling, sensor deployment and other projects. The detection cost is low and the required detection space is small;

(3) The transient electromagnetic method is sensitive to water-bearing areas in near-ground strata, can eliminate its own secondary noise during detection, and is less affected by the stratum. Its results have strong abnormal response, simple morphology, strong resolution, and high detection accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a nondestructive detection device for leakage of a vertical isolation barrier in an embodiment;

FIG2 is a flow chart of a method for using a nondestructive detection device for leakage of a vertical isolation barrier in an embodiment;

FIG3 is a schematic diagram of a site use for nondestructive detection of leakage of a vertical isolation barrier in an embodiment;

FIG4 is a schematic diagram of determining the detection section selection range in the embodiment;

FIG5 is a resistivity contour map of the detection section 1 m behind the vertical barrier in the embodiment;

FIG6 is a resistivity contour diagram of the detection section 3 m behind the vertical barrier in the embodiment.

Numbers in the figure: 1—high voltage power supply, 2—antenna wire frame, 3—transient electromagnetic instrument host, 4—cable, 5—wifi data transmission module, 6—operation terminal, 7—level, 8—laser locator, 9—laser receiver, 10—main frame, 11—telescopic tripod, 12—universal wheel, 13—high voltage power supply compartment, 14—instrument host compartment, 15—antenna wire frame placement guide rail, 16—wifi module compartment, 17—site, 18—vertical isolation barrier, 19—flow field direction, 20—detection section, 21—detection point, 22—detection device, 23—resistivity change position, 24—highest water level behind the vertical isolation barrier, 25—detection section layout range.

DETAILED DESCRIPTION

The following will clearly and completely describe the technical solutions of various embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Referring to FIG. 1 , a nondestructive detection device for leakage of a vertical isolation barrier shown in the figure is a preferred technical solution of the present invention, and mainly comprises: a detection device, a detection frame, and a positioning device;

The detection equipment includes: a high voltage power supply 1, an antenna wire frame 2, a transient electromagnetic instrument host 3, a cable 4, a wifi data transmission module 5, and an operation terminal 6;

The detection vehicle frame includes: a main frame 10, a telescopic tripod 11, a universal wheel 12, a high-voltage power supply compartment 13, an instrument host compartment 14, an antenna wire frame placement guide rail 15, a wifi module compartment 16, and a level meter 7;

The positioning device comprises: a laser positioning device 8 and a laser receiver 9;

The main frame is composed of two layers of rectangular frames, which are fixedly connected by the high-voltage power supply compartment 13, the instrument host compartment 14, and the wifi module compartment 16 distributed at the four corners inside the main frame. The antenna wire frame placement guide rail 15 is arranged in the middle of the main frame for placing the detection equipment;

The outer layers of the high-voltage power supply compartment 13, the instrument host compartment 14, and the wifi module compartment 16 are all wrapped with shielding covers to prevent the stray current of the equipment from affecting the antenna wire frame connection and signal transmission, thereby improving the detection accuracy;

The high-voltage power supply compartments 13 are provided with two, which are divided into a main power supply compartment and a backup power supply compartment. The telescopic tripods 11 are divided into four, each of which is connected to the four corners of the main frame at the upper end and has a universal wheel installed at the lower end;

The antenna wire frame placement guide rail 15 is composed of two upper and lower circular rings that match the diameter of the antenna wire frame 2 and two sliding damping guide rails built into the upper and lower circular rings. The upper and lower circular rings are fixedly connected to the upper and lower rectangular frames in the main frame 10 through connecting rods respectively. The outside of the antenna wire frame 2 is provided with a guide rail slider through a trapezoidal mortise and tenon structure. The slider cooperates with the guide rail to achieve the ability of the antenna wire frame 2 to slide up and down on the guide rail after being installed on the guide rail. The guide rail slider is connected to the antenna wire frame 2 through a trapezoidal mortise and tenon structure to ensure stability while facilitating disassembly. When testing is required, the signal transmitting end of the antenna wire frame 2 is close to the ground. When the test is completed, the wire frame slides up and leaves the ground to facilitate the movement of the test frame.

The level 7 is installed on one side of the connecting rod, close to the antenna wire frame, horizontally upward;

The laser receiver 9 is installed at one end of the main frame, with the receiving end facing forward, toward the laser locator 8.

The telescopic tripod 11 is a sleeve structure, and the height of the tripod can be adjusted by adjusting the inner tube. By adjusting the height of the four telescopic tripods 11, the detection device can be in a suitable detection posture in a complex site; the universal wheel 12 has a locking structure, which can realize the convenient movement of the detection frame and absolute stability during detection;

The antenna wire frame 2 is connected to the high-voltage power supply 1 and the transient electromagnetic instrument host 3 through cables 4 respectively, the transient electromagnetic instrument host 3 is connected to the high-voltage power supply 1 through cables 4, the wifi data transmission module 5 is connected to the high-voltage power supply 1 through cables 4, and the transient electromagnetic instrument host 3 is connected to the operation terminal 6 through wifi wireless transmission.

Referring to Figure 2-4, a practical method of a nondestructive detection device for leakage of a vertical isolation barrier is shown in the following specific working method:

Step S1: Establishment of vertical isolation barrier database of the site

S1-1 Survey site 17 engineering data, including scope, soil layer structure, permeability coefficient of each soil layer, spatial position, geometric parameters, position coordinates, and permeability coefficient of vertical isolation barrier 18;

S1-2 Investigate hydrogeological data, including flow direction 19, flow velocity, and water level in site 17;

S1-3 organizes the above survey data into a site vertical isolation barrier database.

Step S2: Arrange the detection section 20 and the detection point 21

S2-1: establishing a numerical model of the site including the vertical isolation barrier 18 according to the engineering data of the site 17; assigning values to each entity and boundary in the numerical model according to the hydrogeological data;

S2-2 carries out numerical simulation to obtain the groundwater flow field distribution of the site including the vertical isolation barrier 18;

S2-3 sets the horizontal distance from the vertical isolation barrier 18 to the highest water level 24 at the rear side of the vertical isolation barrier 18 as the arrangement range 25 of the isolation barrier detection section 20;

The rear side of the vertical isolation barrier 18 is the side with low water head in the site flow field. The length of the detection section 20 should not be less than the length of the vertical isolation barrier 18. Multiple detection sections can be arranged within the arrangement range 25 of the detection section 20, and the spacing between multiple sections is not greater than 2m. In this embodiment, the arrangement range 25 is 10m behind the vertical isolation barrier, and the detection sections 20 are arranged at 1m and 3m behind the vertical isolation barrier.

S2-4 determines the number of detection points 21 on the detection section 20 according to the accuracy of the detection device 22, and arranges no less than one detection point 21 within the detection accuracy range of the detection device 22; the detection points 21 should be staggered when there are multiple detection sections.

Step S3: Leakage detection and identification

S3-1 Clean and level the detection section 20, ensure that there are no metal components and areas containing clear water within 1m on both sides of the detection section 20, and reduce the noise level during detection;

S3-2: The laser locator 8 is installed at one end of the detection section, and the coordinates are initialized with the installation position of the laser locator 8 as the origin (0, 0), and the position coordinates of the detection point 21 on the detection section 20 are imported into the laser locator 8; the laser locator 8 emits laser along the detection section to fix the detection track, and the laser receiver 9 receives the laser to correct the detection track, and gives a sound reminder when reaching the detection point 21, so as to realize automatic calibration of the detection point 21;

S3-3 calibrates the detection parameters of the detection device 22; during calibration, one person operates the detection frame, connects and turns on the high-voltage power supply 1, the antenna wire frame 2, the transient electromagnetic instrument host 3, and the wifi data transmission module 5, and one person holds the operation terminal 6 to adjust the parameters;

The appropriate transmission frequency, superposition period and other parameters are calibrated through field tests. The transmission frequency is between 2.5-200Hz. The deeper the detection depth, the smaller the required transmission frequency. Conversely, the larger the transmission frequency. Generally, when the depth of the vertical isolation barrier 18 is 5-20m, the frequency is selected as 25Hz, and when the depth of the barrier 18 is 20-50m, the frequency is selected as 6.25Hz. The number of superpositions is related to the noise level. In practical applications, it can be determined according to the transmission frequency. When the frequency is selected as 25Hz, the number of superpositions is 500 times, and the return signal should be repeatedly observed twice to determine the parameters. When the frequency is selected as 6.25Hz, the number of superpositions is 200 times, and the return signal should be repeatedly observed twice to determine the parameters. In this embodiment, the transmission frequency is selected as 25Hz and the number of superpositions is 500 times;

During the test, the operation terminal 7 is at least 5m away from the antenna wire frame 2 to prevent the operation terminal 6 from interfering with the detection signal. During the test, the operation terminal 7 is at least 20m away from the antenna wire frame 2 to ensure stable data transmission.

S3-4: Adjust the detection posture of the detection device 22; when adjusting the posture, close the locking mechanism of the universal wheel 12 to ensure the stability of the detection frame; the detection frame operator adjusts the telescopic tripod 11 according to the data feedback of the level meter 7 to make the detection frame in a completely horizontal detection posture, and lowers the antenna wire frame 2 to make the antenna wire frame 2 completely contact the ground; one person holds the operation terminal 6 to carry out the test;

S3-5 performs point-by-point detection of the detection point 21 starting from the origin, and step S3-4 needs to be repeated before each detection; during the detection, the calibration parameters described in step S3-3 are used to detect and obtain the detection results such as the induced electromotive force and the induced current in the soil; after the detection, the antenna wire frame 2 is raised, the locking structure of the universal wheel 12 is opened, and the detection is moved along the detection section to the next detection point 21 for detection.

S3-6 using numerical software to invert the detection results of the induced electromotive force, induced current, etc. in the soil in step S3-5 to obtain the resistivity contour map of the detection section 20 arranged at 1m and 3m behind the vertical isolation barrier;

S3-7 determines the resistivity change position 23 and then the leakage position by comparing the resistivity distribution at different times and spaces; as shown in Figures 5-6, the resistivity change position 23 marked in Figure 5 is the position where the resistivity in the soil layer 1m behind the vertical barrier is lower than the normal value of the surrounding flow field. The marked resistivity change positions 23 are all "isolated island change areas". The "isolated island-shaped" change areas are circular and quasi-circular resistivity distribution areas that are obviously different from the surrounding resistivity distribution law. There is no "connected change area" in the figure. The "connected change area" is formed after the "isolated island change area" is formed. Under the action of time, water continues to infiltrate to form a new "isolated island change area", and there is a low resistivity area connecting the two "isolated island change areas"; in comparison, Figure 6 is a resistivity contour map in the soil layer 3m behind the vertical barrier, and there is no resistivity change point in the figure.

The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims (9)

1. A method for using a nondestructive testing device for leakage of a vertical isolation barrier, the nondestructive testing device for leakage of a vertical isolation barrier comprising a testing device, a testing frame, and a positioning device; The detection equipment includes: a high-voltage power supply, an antenna wire frame, a transient electromagnetic instrument host, cables, a wifi data transmission module, and an operation terminal, which are used to realize detection control, signal transmission and return, data transmission and data processing functions; The detection vehicle frame includes: a main frame, a telescopic tripod, universal wheels, a high-voltage power supply compartment, an instrument host compartment, an antenna wire frame placement guide rail, a wifi module compartment, and a level gauge, which are used to place the detection equipment, realize quick movement between sites, and perform horizontal adjustment of the detection posture; The positioning equipment includes: a laser positioning device and a laser receiver. The laser positioning device is fixed at the starting end of the detection section and is used to emit laser signals. The laser receiver is fixed at one end of the detection frame and is used to receive laser signals. The combination of the two can realize accurate fixation of the detection track and automatic positioning of the measurement point. The main frame is composed of two layers of rectangular frames, which are fixedly connected by the high-voltage power supply compartment, the instrument host compartment, and the wifi module compartment distributed at the four corners inside the main frame. The antenna wire frame placement guide rail is arranged in the middle of the main frame for placing the detection equipment, and is characterized in that it includes the following steps: Step S1: Establishment of vertical isolation barrier database of the site S1-1 Investigate the engineering data of the site, including the site scope, soil layer structure, permeability coefficient of each soil layer, spatial position of the vertical isolation barrier, geometric parameters, location coordinates, and permeability coefficient; S1-2 Investigate hydrogeological data, including flow direction, flow velocity, and water level in the site; S1-3 Organize the above survey data into a site vertical isolation barrier database; Step S2: Arrange the test sections and test points S2-1: establishing a site numerical model including a vertical isolation barrier based on the site engineering data; assigning values to each entity and boundary in the numerical model based on the hydrogeological data; S2-2 Carry out numerical simulation to obtain the groundwater flow field distribution of the site with vertical isolation barriers; S2-3 sets the horizontal distance from the vertical isolation barrier to the highest water level on the rear side of the vertical isolation barrier as the layout range of the isolation barrier detection section, and multiple detection sections can be arranged within the layout range of the detection section; S2-4 determining the number of detection points on the detection section according to the accuracy of the detection device, and arranging at least one detection point within the detection accuracy range of the detection device; the detection points should be arranged in a staggered manner when there are multiple detection sections; Step S3: Leakage detection and identification S3-1 Clean and level the test section to ensure that there are no metal components or areas with clear water within 1m on both sides of the test section line to reduce the noise level during testing; S3-2: The laser locator is installed at one end of the detection section, and the coordinates are initialized with the installation position of the laser locator as the origin (0, 0), and the coordinates of the detection point position on the detection section are imported into the laser locator; the laser locator emits laser along the detection section to fix the detection track, and the laser receiver receives laser to correct the detection track, and gives a sound reminder when reaching the detection point, so as to realize automatic calibration of the detection point; S3-3 calibrates the detection parameters of the detection device; during calibration, one person operates the detection frame, connects and turns on the high-voltage power supply, antenna wire frame, transient electromagnetic instrument host, and wifi data transmission module, and one person holds the operation terminal to adjust the parameters; S3-4: adjusting the detection posture of the detection device; closing the universal wheel locking mechanism during posture adjustment to ensure the stability of the detection frame; the detection frame operator adjusts the telescopic tripod according to the level meter data feedback to make the detection frame in a completely horizontal detection posture, and lowers the antenna wire frame to make the antenna wire frame completely contact the ground; one person holds the operation terminal to carry out the test; S3-5 starts from the origin and detects the detection points point by point. Step S3-4 needs to be repeated before the detection. During the detection, the calibration parameters described in step S3-3 are used to detect and obtain the detection results of the induced electromotive force and induced current in the soil. After the detection, the antenna wire frame is adjusted upward, the universal wheel locking structure is opened, and the detection is moved along the detection section to the next detection point for detection; S3-6: using numerical software to invert the induced electromotive force and induced current detection results in the soil in step S3-5 to obtain a resistivity contour map of one or more detection sections; S3-7 By comparing the resistivity distribution at different times and spaces, the resistivity change location is determined, and then the leakage location is determined. 2. The method for using a nondestructive detection device for leakage of a vertical isolation barrier according to claim 1 is characterized in that the rear side of the vertical isolation barrier is the side with low water head in the site flow field, the length of the detection section should not be less than the length of the barrier, and the spacing between multiple detection sections is not greater than 2m. 3. The method for using a vertical isolation barrier leakage nondestructive detection device according to claim 1 is characterized in that the distance between the operating terminal and the antenna wire frame during testing is not less than 5m to prevent the terminal from interfering with the detection signal, and the distance between the operating terminal and the antenna wire frame during testing is not more than 20m to ensure stable data transmission. 4. The method for using a nondestructive detection device for leakage of a vertical isolation barrier according to claim 1 is characterized in that the resistivity change position is the position where the resistivity behind the vertical barrier is lower than the normal value of the surrounding flow field, and the change is divided into "isolated island change area" and "connected change area". The degree of leakage can be comprehensively judged by combining the change area and the remaining sections, and the spatial coordinates of the resistivity change position are calibrated to determine the leakage position of the underground vertical barrier. 5. The method for using a vertical isolation barrier leakage nondestructive detection device according to claim 1 is characterized in that the outer layers of the high-voltage power supply compartment, the instrument host compartment, and the wifi module compartment are all wrapped with shielding covers to prevent the stray current of the equipment from affecting the connection and signaling of the antenna wire frame and improving the detection accuracy; two high-voltage power supply compartments are provided, which are divided into a main power supply compartment and a backup power supply compartment, and the telescopic tripod is divided into four, each of which is connected to the four corners of the main frame at the upper end and has a universal wheel installed at the lower end. 6. The method for using a vertical isolation barrier leakage nondestructive detection device according to claim 1 is characterized in that the antenna wire frame placement guide rail is composed of two upper and lower circular rings matching the diameter of the antenna wire frame and two sliding damping guide rails built into the upper and lower circular rings, the upper and lower circular rings are fixedly connected to the upper and lower rectangular frames in the main frame through connecting rods respectively, and a guide rail slider is provided on the outside of the antenna wire frame through a trapezoidal mortise and tenon structure, and the slider cooperates with the guide rail to enable the antenna wire frame to slide up and down on the guide rail after being installed on the guide rail. 7. The method for using a vertical isolation barrier leakage nondestructive detection device according to claim 1 is characterized in that the spirit level is installed on a side connecting rod, close to the antenna wire frame position, horizontally upward, and the laser receiver is installed at one end of the main frame, with the receiving end facing forward, toward the laser locator. 8. The method for using a vertical isolation barrier leakage nondestructive detection device according to claim 1 is characterized in that the telescopic tripod is a sleeve structure, and the height of the tripod can be adjusted by adjusting the inner tube, and the detection device can be in a suitable detection posture in a complex site by adjusting the height of the four tripods; the universal wheel has a locking structure, which can realize the convenient movement of the detection frame and stability during detection. 9. The method for using a vertical isolation barrier leakage nondestructive detection device according to claim 1 is characterized in that the antenna wire frame is connected to the high-voltage power supply and the transient electromagnetic instrument host through cables respectively, the transient electromagnetic instrument host is connected to the high-voltage power supply through cables, the wifi data transmission module is connected to the high-voltage power supply through cables, and the transient electromagnetic instrument host is connected to the operation terminal through wifi wireless transmission.