CN114993910B - Nondestructive testing device for leakage of vertical isolation barrier and application method - Google Patents
Nondestructive testing device for leakage of vertical isolation barrier and application method Download PDFInfo
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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
Technical Field
The invention belongs to the field of pollution resistance and control, and particularly relates to a nondestructive testing device for leakage of a vertical isolation barrier and a using method thereof.
Background
Industrial enterprises have great harm in that pollutants invade plant soil and groundwater during construction and operation, and therefore, a polluted site needs to be controlled. The utilization of the emerging vertical isolation barrier technology for its control is the most suitable way at the present stage. Because of the difficulty of self-remediation of contaminants in the field, vertical barriers often assume tens or even decades of service. During the service period of the barrier, damage and leakage are often generated under the action of environmental damage and surface load, and immeasurable loss is caused. Therefore, the detection and maintenance of the underground vertical isolation barrier are important preconditions and guarantees for limiting the migration of pollutants and ensuring the production health of life around the site.
At present, the method for monitoring the seepage-proofing state of the vertical isolation barrier is mainly a drilling monitoring method, namely a plurality of deep pumping wells and observation wells are arranged in front of and behind the barrier to carry out pumping tests and tracing tests, and the seepage-proofing effect of the barrier is judged by monitoring the water level change in the holes. However, as the barrier is affected by stratum and field range, the length and depth are different, and the barrier seepage prevention condition is difficult to master comprehensively by adopting observation well monitoring; meanwhile, as the depth-to-diameter ratio of the drilling hole is too large, the drilling hole is extremely easy to collapse and lose efficacy after being disturbed, and the long-term monitoring cost is huge; therefore, the rapid and nondestructive detection of the seepage-proofing state of the vertical isolation barrier is a difficult point and pain point to be solved urgently in the field at present.
Transient Electromagnetic Method (TEM) is a time domain electromagnetic method of induction type, mainly by emitting field pulse signals to the underground once through a non-grounding coil or a grounding electrode, and collecting secondary fields from different moments in the underground in one period through a receiving coil, and by analyzing induced electromotive force signals at different moments to infer the distribution of geological media. The technology has the advantages of no exploration, high detection efficiency, sensitivity to low resistance and the like, and is widely applied to the fields of mine goaf detection, tunnel advanced prediction, metal mineral exploration and the like. The movable instantaneous electromagnetic detection equipment comprises a coil, a power supply, a host and an operation terminal, all the components are connected by virtue of cables, and four to five persons are usually required to cooperatively operate in order to prevent stray currents generated during operation of the host, the power supply and the operation terminal from influencing detection signals. Moreover, the ground condition of the industrial pollution site is complex, the field accumulation is more, the detection process consumes more manpower, the working procedure is complicated during movement, and the detection position is easily deviated only by manual positioning in long-distance detection, so that the detection error is increased. Therefore, how to implement a proper detection device and method becomes a key of the problem according to the engineering characteristics of the vertical isolation barrier of the polluted site.
Disclosure of Invention
Aiming at the actual problems existing in the prior vertical barrier seepage prevention state monitoring, the invention discloses a vertical isolation barrier seepage nondestructive testing device and a using method thereof. The invention considers that the local soil is rich in water after the vertical barrier leaks, the leakage area is in a low-resistance state, and the invention combines a miniaturized high-precision transient electromagnetic technology to realize nondestructive detection of the vertical barrier leakage in an industrial pollution site, reduce the expenditure of monitoring engineering and the labor consumption and improve the detection precision.
A vertical isolation barrier leak nondestructive testing device, comprising: the detection device is used for detecting the frame and the positioning device;
The detection apparatus includes: a high-voltage power supply, an antenna wire frame, a transient electromagnetic instrument host, a cable, a wifi data transmission module and an operation terminal, the system is used for realizing the functions of detection control, signal transmission, feedback, data transmission, data processing and the like; 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 mounting guide rail, a wifi module bin and a level meter, wherein the wifi module bin is used for placing the detection equipment, realizing rapid movement between sites and executing horizontal adjustment of detection postures; the positioning equipment is composed of a laser positioning instrument and a laser receiver, wherein the laser positioning instrument is fixed at the starting end of a detection section and used for transmitting laser signals, the laser receiver is fixed at one end of the detection frame and used for receiving the laser signals, and the laser positioning instrument and the laser receiver are combined to realize accurate fixation of detection tracks and automatic positioning of measuring points.
Further, the main body frame is composed of an upper rectangular frame and a lower rectangular frame, the upper rectangular frame and the lower rectangular frame are fixedly connected through the high-voltage power supply bin, the instrument host bin and the wifi module bin which are distributed at four corners in the main body frame, and the antenna wire frame arranging guide rail is arranged in the middle of the main body frame and used for placing the detection equipment; the outer layers of the wifi module bin are wrapped with shielding covers, so that the influence of stray current on antenna wire frame receiving and signaling caused by equipment operation is avoided, and the detection precision is improved; the high-voltage power supply bin is divided into a main power supply bin and a standby power supply, the telescopic foot rest is divided into four parts, the upper end of each part is connected with four corners of the main body frame, and the lower end of each part is provided with a universal wheel.
Further, the antenna wire frame arrangement guide rail comprises an upper ring, a lower ring and two sliding damping guide rails, wherein the upper ring and the lower ring are matched with the diameter of the antenna wire frame, the two sliding damping guide rails are arranged in the upper ring and the lower ring, the upper ring and the lower ring are respectively fixedly connected with the upper rectangular frame and the lower rectangular frame in the main body frame body through connecting rods, guide rail sliding blocks are arranged outside the antenna wire frame through trapezoidal mortise-tenon structures, the guide rail sliding blocks and the guide rails are matched, so that the antenna wire frame can slide up and down on the guide rails after being mounted on the guide rails, the guide rail sliding blocks are connected with the antenna wire frame through the trapezoidal mortise-tenon structures, the stability is guaranteed, the signal transmitting ends of the antenna wire frame are tightly attached to the ground when detection is needed, and the wire frame slides up and leaves the ground when detection is completed.
Further, the level gauge is installed on one side connecting rod, is close to the antenna wire frame position, and is horizontally upwards, the laser receiver is installed at one end of the main body frame, and the receiving end is forwards towards the laser positioning instrument.
Furthermore, the telescopic foot rest is of a sleeve structure, the height of the foot rest can be adjusted by adjusting the inner cylinder, and the detection device is in a proper detection posture in a complex field by adjusting the heights of the four foot rests; the universal wheel is provided with a locking structure, so that convenient movement of the detection frame and absolute stability during detection can be realized.
Further, the antenna wire frame leads to the cable and is connected with high-voltage power supply and transient electromagnetic instrument host computer respectively, transient electromagnetic instrument host computer passes through the cable and is connected with high-voltage power supply, wifi data transmission module passes through the cable and is connected with high-voltage power supply, transient electromagnetic instrument host computer passes through wifi wireless transmission and is connected with operation terminal.
The invention also provides a using method of the vertical isolation barrier leakage nondestructive testing device, which comprises the following steps:
step S1: site vertical isolation barrier database establishment
S1-1, site engineering data are surveyed, wherein the site engineering data comprise a site range, a soil layer structure, each soil layer permeability coefficient, the spatial position, geometric parameters, position coordinates and permeability coefficients of a vertical isolation barrier;
S1-2, investigating hydrogeologic data, including flow field direction, flow speed and water level in a field;
S1-3, the investigation materials are arranged into a site vertical isolation barrier database.
Step S2: arranging detection sections and detection points
S2-1, establishing a site numerical model containing vertical isolation barriers according to the site engineering data; assigning values to each entity and boundary in the numerical model according to the hydrogeologic data;
S2-2, carrying out numerical simulation to obtain field underground water flow field distribution containing vertical isolation barriers;
S2-3, setting the horizontal distance from the vertical isolation barrier to the highest water level at the rear side of the vertical isolation barrier as the arrangement range of the detection section of the isolation barrier;
The rear side of the vertical isolation barrier is the side with low water head in the field flow field, the length of the detection section is not lower than that of the barrier, a plurality of detection sections can be arranged within the arrangement range of the detection sections, and the distance between the sections is not more than 2m.
S2-4, determining the number of detection points on a detection section according to the precision of the selected detection device, wherein the number of detection points is not less than 1 in the detection precision range of the detection device; the detection points should be staggered when there are multiple detection sections.
Step S3: leak detection and discrimination
S3-1, cleaning and flattening the detection section, ensuring that no metal component and clear water containing area exist in 1m on two sides of the detection section line, and reducing noise level during detection;
S3-2, erecting the laser positioning instrument to one end of a detection section, initializing coordinates by taking the erection position of the laser positioning instrument as an origin (0, 0), and guiding the position coordinates of a detection point on the detection section into the laser positioning instrument; the laser positioning instrument emits laser along the detection section for fixing the detection track, the laser receiver receives the laser for correcting the detection track and carrying out acoustic reminding when reaching the detection point so as to realize automatic calibration of the detection point;
S3-3, calibrating detection parameters of the detection device; when the calibration is performed, one person operates the detection frame, the high-voltage power supply, the antenna wire frame, the transient electromagnetic instrument host and the wifi data transmission module are connected and started, and one person holds the operation terminal by hand to perform parameter adjustment;
further, parameters such as proper transmission frequency, superposition period and the like are calibrated through field test, the transmission frequency is 2.5-200Hz, the deeper the detection depth is, the smaller the required transmission frequency is, otherwise, the larger the transmission frequency is, the frequency is generally selected to be 25Hz when the barrier depth is 5-20m, and the frequency is generally selected to be 6.25Hz when the barrier depth is 20-50 m. The superposition times are related to noise level, and can be determined according to the sending frequency in practical application, when the frequency is selected to be 25Hz, the superposition times are 500 times, the return signal should be observed twice for parameter determination, when the frequency is selected to be 6.25Hz, the superposition times are 200 times, and the return signal should be observed twice for parameter determination;
further, the distance between the operation terminal and the antenna wire frame is not smaller than 5m during the test, the terminal is prevented from interfering with the detection signal, the distance between the operation terminal and the antenna wire frame is not larger than 20m during the test, and the stability of data transmission is ensured.
S3-4, adjusting the detection posture of the detection device; closing the universal wheel locking mechanism during posture adjustment to ensure that the detection frame is stable; the detecting frame operator adjusts the telescopic foot stand according to the data feedback of the level instrument to enable the detecting frame to be in a completely horizontal detecting posture, and adjusts the antenna wire frame downwards to enable the antenna wire frame to be completely contacted with the ground; one person holds the operation terminal to carry out a test;
S3-5, starting to detect the detection points point by point from the origin point, and repeating the step S3-4 before detection; in the detection, the calibration parameters are used for detection in the step S3-3 to obtain detection results of induced electromotive force, induced current and the like in the soil; and after detection, the antenna wire frame is adjusted upwards, the universal wheel locking structure is opened, and the universal wheel locking structure moves to the next detection point along the detection section to execute detection.
S3-6, inverting and obtaining a resistivity contour map of one or more detection sections according to detection results of induced electromotive force, induced current and the like in the soil in the step S3-5 by utilizing numerical software;
S3-7, determining the resistivity mutation position by comparing different time-space resistivity distributions, and further determining the leakage position; the resistivity variation position is a position of which the resistivity is lower than the normal value of the surrounding flow field after the vertical barrier, the variation is divided into an island variation region and a communication variation region, the leakage degree can be comprehensively judged by combining the variation area and the rest sections, the spatial coordinates of the resistivity variation position are calibrated, and the leakage position of the underground vertical barrier is determined.
Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, the shielding device bin is arranged on the detection device to integrate noise-containing equipment such as a high-voltage power supply, a transient electromagnetic instrument host, a wifi module and the like with the antenna wire frame, so that the equipment integrity is improved, the detection steps are simplified, and the number of testers is reduced; the moving convenience, the terrain adaptability and the detecting gesture accuracy of the detecting device are improved by designing the four-corner telescopic foot rest and the antenna wire frame arranging guide rail; by designing the laser positioning device, the accuracy of the measuring point and the maintenance of the measuring rail are improved. The whole detection process is simplified, the detection error is reduced, the detection speed is accelerated, the practicability is high, and the method is very suitable for field underground vertical barrier leakage detection.
(2) The detection device disclosed by the invention utilizes the characteristics of increased water content of local soil and low local resistance after the underground vertical barrier leaks, realizes the leakage detection of the underground vertical barrier by combining a miniaturized and high-precision transient electromagnetic technology, is convenient and lossless in detection method, does not need engineering such as drilling, sensor arrangement and the like, and has low detection cost and small required detection space;
(3) The transient electromagnetic method is sensitive to the detection of the water-containing zone in the near stratum, can eliminate secondary noise during the detection, is little affected by the stratum, and has the advantages of strong abnormal response, simple form, strong resolving power and high detection precision.
Drawings
FIG. 1 is a schematic diagram of a vertical isolation barrier leak nondestructive testing apparatus in an embodiment;
FIG. 2 is a flow chart of a method of using a vertical isolation barrier leak nondestructive testing apparatus in accordance with an embodiment;
FIG. 3 is a schematic illustration of a site use for non-destructive testing of vertical isolation barrier leakage in an embodiment;
FIG. 4 is a schematic diagram showing a detection section selection range determination in an embodiment;
FIG. 5 is a resistivity contour plot of a test section 1m after a vertical barrier in an example;
FIG. 6 is a contour plot of resistivity of a test section 3m after a vertical barrier in an example.
Reference numerals in the drawings: 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 meter, 8-laser positioning instrument, 9-laser receiver, 10-main body frame, 11-telescopic foot rest, 12-universal wheel, 13-high-voltage power supply bin, 14-instrument host bin, 15-antenna wire frame arrangement guide rail, 16-wifi module bin, 17-place, 18-vertical isolation barrier, 19-flow field direction, 20-detection section, 21-detection point, 22-detection device, 23-resistivity differential position, 24-vertical isolation barrier rear side water level highest place, 25-detection section arrangement range.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, embodiments of the present invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Referring to fig. 1, a vertical isolation barrier leakage nondestructive testing device in the drawings is a preferred technical scheme of the invention, and mainly comprises: 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 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 frame comprises: the device comprises a main body frame 10, a telescopic foot rest 11, universal wheels 12, a high-voltage power supply bin 13, an instrument host bin 14, an antenna wire frame arranging guide rail 15, a wifi module bin 16 and a level meter 7;
The positioning device includes: a laser locator 8, a laser receiver 9;
The main body frame consists of an upper rectangular frame and a lower rectangular frame, the upper rectangular frame and the lower rectangular frame are fixedly connected through the high-voltage power supply bins 13 distributed at four corners in the main body frame, the instrument host bin 14 and the wifi module bin 16, and the antenna wire frame arranging guide rail 15 is arranged in the middle of the main body frame and used for placing the detection equipment;
the outer layers of the high-voltage power supply bin 13, the instrument host bin 14 and the wifi module bin 16 are wrapped with shielding cases, so that the influence of stray current on antenna wire frame receiving and signaling caused by equipment operation is avoided, and the detection precision is improved;
The two high-voltage power supply bins 13 are divided into a main power supply bin and a standby power supply, the four telescopic foot frames 11 are divided, the upper ends of the four telescopic foot frames are connected with four corners of the main body frame, and universal wheels are arranged at the lower ends of the four telescopic foot frames;
The antenna wire frame arrangement guide rail 15 comprises an upper ring and a lower ring which are matched with the diameter of the antenna wire frame 2 and two sliding damping guide rails which are arranged in the upper ring and the lower ring, the upper ring and the lower ring are respectively fixedly connected with an upper rectangular frame and a lower rectangular frame in the main body frame 10 through connecting rods, guide rail sliding blocks are arranged outside the antenna wire frame 2 through trapezoidal mortise and tenon structures, and the guide rail sliding blocks and the guide rails are matched to realize that the antenna wire frame 2 can slide up and down on the guide rails after being installed on the guide rails, the guide rail sliding blocks are connected with the antenna wire frame 2 through the trapezoidal mortise and tenon structures, so that the stability is ensured, meanwhile, the disassembly is convenient, the signal transmitting ends of the antenna wire frame 2 are tightly attached to the ground when the detection is needed, and the antenna wire frame slides up and leaves the ground to conveniently move to detect the frame when the detection is completed.
The level gauge 7 is arranged on a connecting rod at one side, is close to the position of the antenna wire frame and is horizontally upwards;
the laser receiver 9 is mounted at one end of the main body frame, and the receiving end faces forward towards the laser positioning instrument 8.
The telescopic foot rest 11 is of a sleeve structure, the height of the foot rest can be adjusted by adjusting the inner barrel, and the detection device is in a proper detection posture in a complex field by adjusting the heights of the four telescopic foot rest 11; the universal wheel 12 is provided with a locking structure, so that the convenient movement of the detection frame and the absolute stability during detection can be realized;
The antenna wire frame 2 is connected with the high-voltage power supply 1 and the transient electromagnetic instrument host computer 3 respectively through the cable 4, the transient electromagnetic instrument host computer 3 is connected with the high-voltage power supply 1 through the cable 4, the wifi data transmission module 5 is connected with the high-voltage power supply 1 through the cable 4, and the transient electromagnetic instrument host computer 3 is connected with the operation terminal 6 through wifi wireless transmission.
Referring to fig. 2-4, a practical method of a vertical isolation barrier leakage nondestructive testing device specifically works as follows:
step S1: site vertical isolation barrier database establishment
S1-1, survey of site 17 engineering data, including a range, a soil layer structure, each soil layer permeability coefficient, spatial positions, geometric parameters, position coordinates and permeability coefficients of vertical isolation barriers 18;
s1-2, investigating hydrogeologic data, including the flow field direction 19, the flow velocity and the water level in the field 17;
S1-3, the investigation materials are arranged into a site vertical isolation barrier database.
Step S2: an inspection section 20 and an inspection point 21 are arranged
S2-1, establishing a site numerical model containing vertical isolation barriers 18 according to engineering data of the site 17; assigning values to each entity and boundary in the numerical model according to the hydrogeologic data;
S2-2, carrying out numerical simulation to obtain site underground water flow field distribution containing vertical isolation barriers 18;
S2-3, setting 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 field flow field, the length of the detection section 20 is not lower than that of the vertical isolation barrier 18, a plurality of detection sections can be arranged within the arrangement range 25 of the detection section 20, the spacing between the sections is not more than 2m, in this embodiment, the arrangement range 25 is 10m behind the vertical isolation barrier, and the detection section 20 is arranged at 1m and 3m behind the vertical isolation barrier;
S2-4, according to the precision of the detection device 22, determining the number of detection points 21 on the detection section 20, wherein the number of the detection points 21 is not less than 1 within the detection precision range of the detection device 22; the detection points 21 should be staggered when there are a plurality of detection sections.
Step S3: leak detection and discrimination
S3-1, cleaning and flattening the detection section 20, ensuring that no metal component and clear water containing area exist in 1m on two sides of the detection section 20, and reducing noise level during detection;
S3-2, erecting the laser positioning instrument 8 to one end of a detection section, initializing coordinates by taking the erection position of the laser positioning instrument 8 as an origin (0, 0), and guiding the position coordinates of a detection point 21 on the detection section 20 into the laser positioning instrument 8; the laser positioning instrument 8 emits laser along a detection section for fixing a detection track, the laser receiver 9 receives the laser for correcting the detection track and carrying out acoustic reminding when reaching the detection point 21 so as to realize automatic calibration of the detection point 21;
S3-3, calibrating detection parameters of the detection device 22; when the calibration is performed, one person operates the detection frame, the high-voltage power supply 1, the antenna wire frame 2, the transient electromagnetic instrument host 3 and the wifi data transmission module 5 are connected and started, and one person holds the operation terminal 6 to perform parameter adjustment;
The parameters such as proper transmission frequency, superposition period and the like are calibrated through field test, the transmission frequency is between 2.5 and 200Hz, the deeper the detection depth is, the smaller the required transmission frequency is, otherwise, the larger the transmission frequency is, the frequency is generally selected to be 25Hz when the depth of the vertical isolation barrier 18 is between 5 and 20m, and the frequency is generally selected to be 6.25Hz when the depth of the barrier 18 is between 20 and 50 m. The number of overlapping times is related to the noise level, and in practical application, the number of overlapping times is 500 when the frequency is selected to be 25Hz, the number of overlapping times is 200 when the frequency is selected to be 6.25Hz, the number of overlapping times is 500 when the return signal is selected to be 200, and the number of overlapping times is 500 when the return signal is selected to be 25 Hz;
the distance between the operation terminal 7 and the antenna wire frame 2 is not smaller than 5m during the test, the operation terminal 6 is prevented from interfering with the detection signal, the distance between the operation terminal 7 and the antenna wire frame 2 is not larger than 20m during the test, and the stability of data transmission is ensured.
S3-4, adjusting the detection posture of the detection device 22; closing a locking mechanism of the universal wheel 12 during posture adjustment to ensure the stability of the detection frame; the detecting frame operator adjusts the telescopic foot stand 11 according to the data feedback of the level meter 7 to enable the detecting frame to be in a completely horizontal detecting posture, and adjusts the antenna wire frame 2 downwards to enable the antenna wire frame 2 to be completely contacted with the ground; one person holds the operation terminal 6 to conduct a test;
S3-5, starting to detect the detection point 21 point by point from the origin, and repeating the step S3-4 before each detection; in the detection, the calibration parameters are used for detection in the step S3-3 to obtain detection results of induced electromotive force, induced current and the like in the soil; after detection, the antenna wire frame 2 is adjusted upwards, the locking structure of the universal wheel 12 is opened, and the detection is carried out by moving to the next detection point 21 along the detection section.
S3-6, inverting by utilizing numerical software according to detection results of induced electromotive force, induced current and the like in the soil in the step S3-5 to obtain a resistivity contour map of the detection section 20 arranged at 1m and 3m of the vertical isolation barrier;
S3-7, determining a resistivity mutation position 23 by comparing different time-space resistivity distributions, and further determining a seepage position; as shown in fig. 5-6, the marked resistivity-variation position 23 in fig. 5 is a position of the vertical barrier, in which the resistivity in the soil layer 1m after the vertical barrier is lower than the normal value of the surrounding flow field, the marked resistivity-variation positions 23 are all "island-like" regions, which are circular and circular resistivity distribution regions obviously different from the surrounding resistivity distribution rules, and there is no "communication-variation region", which is a new "island-variation region" formed by continuous infiltration of water under the action of time after the formation of the "island-variation region", and the two "island-variation regions" are connected by a low-resistivity region; in contrast, fig. 6 is a contour plot of resistivity in the soil layer 3m after the vertical barrier, where there is no resistivity variation.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (9)
1. The application method of the vertical isolation barrier leakage nondestructive detection device comprises the steps of detecting equipment, a detection frame and positioning equipment;
The detection apparatus includes: a high-voltage power supply, an antenna wire frame, a transient electromagnetic instrument host, a cable, a wifi data transmission module and an operation terminal, the system is used for realizing detection control, signal transmission and return, data transmission and data processing functions;
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 arranging guide rail, a wifi module bin and a level meter, wherein the main body frame, the telescopic foot rest, the universal wheels, the high-voltage power supply bin, the instrument host bin, the antenna wire frame arranging guide rail, the wifi module bin and the level meter are used for placing the detection equipment, realizing rapid movement between sites and executing level adjustment of detection postures;
The positioning device includes: the laser positioning instrument is fixed at the starting end of the detection section and is used for transmitting laser signals, the laser receiver is fixed at one end of the detection frame and is used for receiving the laser signals, and the laser positioning instrument and the laser receiver are combined to realize accurate fixation of detection tracks and automatic positioning of measuring points;
The main body frame comprises upper and lower two-layer rectangle frame, through distributing in inside four corners of main body frame high voltage power supply storehouse, instrument host computer storehouse, wifi module storehouse will be upper and lower two-layer rectangle frame fixed connection, the guide rail is settled to the antenna wire frame arranges in main body frame middle part for place check out test set, its characterized in that includes the following step:
step S1: site vertical isolation barrier database establishment
S1-1, site engineering data are surveyed, wherein the site engineering data comprise a site range, a soil layer structure, each soil layer permeability coefficient, the spatial position, geometric parameters, position coordinates and permeability coefficients of a vertical isolation barrier;
S1-2, investigating hydrogeologic data, including flow field direction, flow speed and water level in a field;
S1-3, arranging the investigation materials into a site vertical isolation barrier database;
step S2: arranging detection sections and detection points
S2-1, establishing a site numerical model containing vertical isolation barriers according to the site engineering data; assigning values to each entity and boundary in the numerical model according to the hydrogeologic data;
S2-2, carrying out numerical simulation to obtain field underground water flow field distribution containing vertical isolation barriers;
S2-3, setting the horizontal distance from the vertical isolation barrier to the highest water level at the rear side of the vertical isolation barrier as the arrangement range of detection sections of the isolation barrier, wherein a plurality of detection sections can be arranged in the arrangement range of the detection sections;
S2-4, determining the number of detection points on a detection section according to the precision of the detection device, wherein the number of detection points is not less than 1 in the detection precision range of the detection device; the detection points are staggered when a plurality of detection sections are formed;
step S3: leak detection and discrimination
S3-1, cleaning and flattening the detection section, ensuring that no metal component and clear water containing area exist in 1m on two sides of the detection section line, and reducing noise level during detection;
S3-2, erecting the laser positioning instrument to one end of a detection section, initializing coordinates by taking the erection position of the laser positioning instrument as an origin (0, 0), and guiding the position coordinates of a detection point on the detection section into the laser positioning instrument; the laser positioning instrument emits laser along the detection section for fixing the detection track, the laser receiver receives the laser for correcting the detection track and carrying out acoustic reminding when reaching the detection point so as to realize automatic calibration of the detection point;
S3-3, calibrating detection parameters of the detection device; when the calibration is performed, one person operates the detection frame, the high-voltage power supply, the antenna wire frame, the transient electromagnetic instrument host and the wifi data transmission module are connected and started, and one person holds the operation terminal by hand to perform parameter adjustment;
S3-4, adjusting the detection posture of the detection device; closing a universal wheel locking mechanism during posture adjustment to ensure that the detection frame is stable; the detecting frame operator adjusts the telescopic foot stand according to the data feedback of the level instrument to enable the detecting frame to be in a completely horizontal detecting posture, and adjusts the antenna wire frame downwards to enable the antenna wire frame to be completely contacted with the ground; one person holds the operation terminal to carry out a test;
S3-5, starting to detect the detection points point by point from the origin point, and repeating the step S3-4 before detection; in the detection, the calibration parameters are used for detection in the step S3-3 to obtain detection results of induced electromotive force and induced current in the soil; after detection, the antenna wire frame is adjusted upwards, the universal wheel locking structure is opened, and the antenna wire frame moves to the next detection point along the detection section to execute detection;
S3-6, inverting and obtaining a resistivity contour map of one or more detection sections according to the detection results of the induced electromotive force and the induced current in the soil in the step S3-5 by utilizing numerical software;
s3-7, determining the resistivity mutation position by comparing different time-space resistivity distributions, and further determining the leakage position.
2. The method of claim 1, wherein the rear side of the vertical isolation barrier is a side with low water head in a field flow field, the length of the detection section is not less than the length of the barrier, and the intervals between the detection sections are not more than 2m.
3. The method for using the vertical isolation barrier leakage nondestructive testing device according to claim 1, wherein the distance between the operation terminal and the antenna wire frame is not smaller than 5m during testing, interference of the terminal to a detection signal is prevented, the distance between the operation terminal and the antenna wire frame is not larger than 20m during testing, and stable data transmission is ensured.
4. The method for using the vertical isolation barrier leakage nondestructive testing device according to claim 1, wherein the resistivity variation position is a position where the resistivity of the vertical barrier is lower than the normal value of the surrounding flow field, the variation is divided into an island variation region and a communication variation region, the leakage degree can be comprehensively judged by combining the variation area and the rest sections, the spatial coordinates of the resistivity variation position are calibrated, and the underground vertical barrier leakage position is determined.
5. The method for using the vertical isolation barrier leakage nondestructive testing device according to claim 1, wherein the high-voltage power supply bin, the instrument host bin and the wifi module bin are all covered with shielding cases, so that the influence of stray current of equipment operation on antenna wire framing and signaling is avoided, and the detection precision is improved; the high-voltage power supply bin is divided into a main power supply bin and a standby power supply, the telescopic foot rest is divided into four parts, the upper end of each part is connected with four corners of the main body frame, and the lower end of each part is provided with a universal wheel.
6. The method for using the vertical isolation barrier leakage nondestructive testing device according to claim 1, wherein the antenna wire frame installation guide rail is composed of an upper ring and a lower ring which are matched with the diameter of the antenna wire frame and two sliding damping guide rails which are arranged in the upper ring and the lower ring, the upper ring and the lower ring are respectively fixedly connected with an upper rectangular frame and a lower rectangular frame in the main body frame through connecting rods, guide rail sliding blocks are arranged outside the antenna wire frame through trapezoid mortise and tenon structures, and the antenna wire frame can slide up and down on the guide rails after being installed on the guide rails through the matching of the sliding blocks and the guide rails.
7. The method of claim 1, wherein the level is mounted on a side link near the antenna wire frame, horizontally up, the laser receiver is mounted at one end of the main body frame, and the receiving end is forward, facing the laser positioner.
8. The method for using the vertical isolation barrier leakage nondestructive testing device according to claim 1, wherein the telescopic foot stand is of a sleeve structure, the height of the foot stand can be adjusted by adjusting the inner barrel, and the detection device is in a proper detection posture in a complex field by adjusting the heights of the four foot stands; the universal wheel is provided with a locking structure, so that convenient movement of the detection frame and stability in detection can be realized.
9. The method for using the vertical isolation barrier leakage nondestructive testing device according to claim 1, wherein the antenna wire frame is connected with a high-voltage power supply and a transient electromagnetic instrument host through cables respectively, the transient electromagnetic instrument host is connected with the high-voltage power supply through cables, the wifi data transmission module is connected with the high-voltage power supply through cables, and the transient electromagnetic instrument host is connected with an operation terminal through wifi wireless transmission.
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| CN112432996A (en) * | 2019-08-09 | 2021-03-02 | 中国石油化工股份有限公司 | Transient electromagnetic time domain multi-channel multi-layer pipe column damage detection system and method |
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| CN112432996A (en) * | 2019-08-09 | 2021-03-02 | 中国石油化工股份有限公司 | Transient electromagnetic time domain multi-channel multi-layer pipe column damage detection system and method |
| CN112346135A (en) * | 2020-11-17 | 2021-02-09 | 黄河勘测规划设计研究院有限公司 | Intelligent inspection detection method for leakage channel of canal embankment project based on Internet of things |
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