Water-induced vibration measuring device for drill hole fractures and use method of water-induced vibration measuring device

Abstract

The invention discloses a water-induced vibration measuring device for drill hole fractures and a using method of the water-induced vibration measuring device, and belongs to the field of underground engineering of roadways, subways and tunnels. The device comprises a center rod body, a water-induced vibration measuring system and a tray fixing device, after the rod body fully injects water into the surface of the whole anchor hole through a high-pressure air pump, the water-induced vibration measuring device starts to operate, and the water in the anchor hole is stimulated to vibrate through vibration of a vibration rod on the surface of the rod body; the water-induced vibration measuring instrument can sense the vibration energy change in the anchor hole crack and convert the vibration energy change into an electric signal, the electric signal is transmitted into an external data processor through a data line, and the electric signal is converted into a vibration energy diagram through the processor, so that the distribution condition of water in the anchor hole crack is determined, and the detection function of the anchor hole crack is realized. The structure can detect the accurate position of the crack in the anchor hole, and has the advantages of accurate detection, reasonable structure, stable function, economy, applicability and the like.

Description

Technical Field

[0001] The invention relates to a water-induced vibration measuring device for a borehole fissure and a use method thereof, and belongs to the field of underground engineering of lanes, subways and tunnels. Background Art

[0002] During tunnel excavation and coal and non-coal mining, as the construction progresses, when the surrounding rock is not stable enough, the cracks around the surrounding rock will further develop, which will easily affect the stability of the entire project and cause direct safety hazards and property losses to the entire project. Anchor hole cracks may have adverse effects on building structures, including weakening structural strength, causing structural deformation and displacement, transmitting sound and vibration, increasing the risk of water penetration and corrosion, and increasing safety risks. Regardless of whether it affects the normal operation of the project, the cracks in the surrounding rock should be thoroughly detected first, which also poses a greater challenge to the current crack detection methods.

[0003] At present, there are very limited methods for detecting cracks in surrounding rocks. The current detection technologies for anchor hole cracks mainly include visual inspection, camera technology, ultrasonic detection technology, etc. One of the commonly used anchor hole crack detection methods is to evaluate the crack conditions through visual inspection. This method relies on manual visual observation, but it is affected by human subjective factors and limited field of view and cannot provide accurate and comprehensive information. In recent years, with the development of camera technology, the use of camera equipment for anchor hole crack detection has become more and more common. Camera technology can provide high-resolution images and videos to help engineers observe and evaluate the size, shape and distribution of cracks. This method usually requires placing a camera in the borehole and transmitting images through cables or wireless technology. Ultrasonic technology is a commonly used non-destructive detection method and is also suitable for anchor hole crack detection. Ultrasonic technology can detect cracks and defects inside the material by transmitting ultrasonic beams into the material. The received ultrasonic signal can be used to evaluate the size, shape and location of the crack. However, these methods still have some limitations, such as subjectivity, field of view limitation, signal interference, etc. Therefore, research and innovation on anchor hole crack detection technology is very necessary to improve the accuracy, efficiency and reliability of detection. Summary of the invention

[0004] Technical problem: In view of the shortcomings of the existing technology, a water-induced vibration measurement device for drilled cracks and a method of using the device are provided, which can simply and efficiently detect the crack information in the anchor hole, which is conducive to preventing accidents, improving the reliability of the structure, reducing maintenance costs, protecting the safety of personnel and property, and improving the quality of the project.

[0005] Technical solution: To achieve the above technical purpose, the present invention discloses a water-induced vibration measuring device for borehole fissures, comprising a central rod body, a water-induced vibration measuring device is arranged on the central rod body, a tray system is arranged at the tail of the central rod body, and the water-induced vibration measuring device is connected to a pore pressure alarm via a generator;

[0006] The central rod body is provided with four water injection pipes arranged axially at equal intervals. All water injection pipes at the tail end of the central rod body are connected to high-pressure air pumps through anti-backflow device pipelines. The anti-backflow device is used to prevent the rapid backflow of water from damaging the device and can also be used as a pipeline switch; the end of the central rod body closes the water injection pipe and is provided with a retractable buffer head, which prevents the central rod body from damaging the anchor hole during the process of penetrating into the anchor hole through retraction;

[0007] The water-induced vibration measuring device as a whole includes a vibration device, a nozzle device and a water-induced vibration measuring instrument arranged regularly on the outside of the central rod body, wherein a plurality of groups of nozzle devices connected to four internal water injection pipes are arranged at intervals on the side wall of the central rod body, each group of nozzle devices includes four conical nozzles arranged around the central rod body to spray water evenly in the entire circumferential direction, and fully fill the cracks in the anchor hole with water, the vibration device is a plurality of groups of vibration rods attached and distributed along the circumference of the outer periphery of the central rod body and arranged at intervals, each group of vibration rods includes four vibration rods evenly distributed around the central rod body, and all water-induced vibration measuring instruments are connected to a data processor arranged outside the borehole through a data cable; the water-induced vibration measuring instrument converts the vibration energy of the water in the anchor hole detected into an electrical signal, and transmits it to the data processor through the data cable, the data processor processes these electrical signals and converts these electrical signals into position data, and finally stores them in a searchable position in the form of a data file;

[0008] The tray system includes a threaded inner tray close to the borehole wall, and a ring tray and a pad that match and are inverted on the borehole wall. Multiple high-strength fixing bolts are used to pass through the openings on the pad and through the ring tray. Finally, the threaded ends of the high-strength fixing bolts are fixedly connected to the threaded holes on the threaded inner tray. Multiple high-strength fixing bolts are installed around the central rod body to fix the tray system. The threaded inner tray is also provided with an emergency air supply hole connected to the anchor hole and a hole pressure alarm for monitoring the water pressure in the hole.

[0009] Furthermore, the central rod body is a solid rod body, and the rod body can be fixed when the retractable buffer head at the end of the central rod body touches the bottom of the anchor hole; the water-induced vibration measuring instrument is connected to a generator and powered by the generator. Each water-induced vibration measuring instrument is connected by a separate data line, and these data lines are finally unified and finally connected to the data processor.

[0010] Furthermore, the vibrating rod is a plastic column inclined at 35 to 75 degrees along the rod body, and its softness prevents the device from damaging the anchor hole during the penetration process.

[0011] Furthermore, when the water pressure exceeds the preset value, the pore pressure alarm is triggered. At this time, the emergency air supply hole will automatically open to balance the air pressure in the anchor hole to prevent excessive pressure from causing further development of cracks and affecting the detection results. After the water in the pore is fully injected and reaches a stable state, all vibrating rods are started at the same time. With the continuous detection of the water-induced vibrator during the vibration process, the data of the cross-sectional information in all anchor holes will be converted into electrical signals and transmitted to the data processor by the data line. The data processor will analyze and select based on the electrical signals generated by the water-induced vibrator. After comprehensive analysis of all data, the final image of the entire anchor hole will be synthesized according to the cross-sectional position. Finally, the corresponding data processing and imaging simulation technology can be used to output the final three-dimensional image of the anchor hole cracks.

[0012] Furthermore, the vibrating rod is connected to a rechargeable battery for providing energy for the operation of the vibrating rod, wherein the water-induced vibration measuring instrument, the vibrating device group and the nozzle device are arranged in a circular manner from the head to the tail of the central rod body according to the arrangement of the vibrating device group, the nozzle device, the water-induced vibration measuring instrument, the nozzle device and the vibrating device group.

[0013] A method for using a water-induced vibration measuring device for a borehole fissure, the steps are as follows:

[0014] First, drill the anchor hole to the required depth at the pre-marked position of the surrounding rock, slowly insert the central rod into the anchor hole, and when the retractable buffer head cannot be retracted, it indicates that the end of the anchor hole has been reached; then, place the threaded inner tray close to the outer wall of the anchor hole, and use multiple high-strength fixing bolts to connect it to the outer ring tray through the pad;

[0015] After the fixing work is completed, the water injection pipe is connected to the external high-pressure air pump, and the high-pressure air pump is connected to the external water storage tank. After the high-pressure air pump is started, it will drive water to flow from the external water storage device into the water injection pipe inside the central rod body. The water in the water injection pipe is sprayed evenly along the circumference through the conical nozzle on the surface of the central rod body, and finally fills the entire anchor hole and even the cracks;

[0016] The water pressure in the anchor hole will continue to increase with the water injection process. When the water pressure exceeds the preset value, the pore pressure alarm will be triggered. At this time, the emergency air supply hole will be opened and the water injection pressure will be reduced at the same time, so that the pore pressure in the anchor hole reaches a stable state;

[0017] After the stable state is reached, the vibrating rod and the water-induced vibration measuring instrument are turned on at the same time. The vibrating rod is controlled by its own battery, which will drive the water in the pore to vibrate and generate vibration energy. The water-induced vibration measuring instrument can accurately detect the vibration energy of the water in the hole, sense the energy changes in the anchor hole cracks, and then convert this energy change into an electrical signal, which is transmitted to the external data processor through the data line. The data processor analyzes the vibration information of the hole pressure water, locates the subtle vibration of the water in the anchor hole, and finally generates the position data of the cracks in the anchor hole. Through the corresponding data processing and imaging simulation, the position information of each section in the anchor hole is finally drawn to form the final crack image.

[0018] Beneficial effects: The present invention injects water into the anchor hole and vibrates it, and detects the existence, size and direction of cracks in the anchor hole through the received vibration information, and evaluates its impact on the project, so that corresponding preventive measures can be taken or the design can be adjusted in time. This device simplifies the crack detection steps, and through the simple pore water vibration principle, it is not only low-cost, but also does not cause damage to the project due to the detection process, thus reducing risks and losses. By detecting cracks based on the principle of water-induced vibration, the precise position and direction of the cracks in the surrounding rock can be detected, and the detection means are efficient and easy to operate. Researching and applying this new anchor hole crack detection method can eliminate the potential risks that cracks bring to construction, which not only improves the safety of the project, but also improves the quality and benefits of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of drilling in an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the structure of a water-induced vibration measuring device for a borehole fissure according to an embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of the installation of the water-induced vibration measuring device for borehole fissures in an embodiment of the present invention;

[0022] FIG4( a ) is a schematic cross-sectional view of a central rod vibrating rod in an embodiment of the present invention;

[0023] FIG4( b ) is a schematic cross-sectional view of a water-induced vibration measuring instrument according to an embodiment of the present invention;

[0024] FIG4( c ) is a schematic cross-sectional view of a conical nozzle in an embodiment of the present invention;

[0025] Figure 5 This is a three-dimensional schematic diagram of a central rod body in an embodiment of the present invention;

[0026] Figure 6 This is a schematic cross-sectional view of the inner and outer trays in an embodiment of the present invention;

[0027] Figure 7It is a schematic diagram of the cross section of the anchor hole and the crack in an embodiment of the present invention.

[0028] In the figure: 1-surrounding rock, 2-anchor hole, 3-conical nozzle, 4-central rod, 5-water-induced vibration measuring instrument, 6-crack, 7-vibrating rod, 8-data cable, 9-rechargeable battery, 10-retractable buffer head, 11-emergency air supply hole, 12-threaded section, 13-threaded inner tray, 14-annular tray, 15-pad, 16-high-strength fixing bolt, 17-water injection pipeline, 18-anti-backflow device, 19-high-pressure air pump, 20-data processor, 21-generator, 22-pore pressure alarm. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the embodiments in the accompanying drawings:

[0030] like Figure 1 , Figure 2 and Figure 5 As shown, the present invention discloses a water-induced vibration measuring device for drilled cracks, comprising a central rod body 4, a water-induced vibration measuring device and a tray fixing device.

[0031] The central rod body 4 is solid but has a porous structure inside, wherein the water-induced vibration measuring instrument, the vibration device and the nozzle device are arranged regularly along the axis. A plurality of 3 to 7 water injection pipes 17 are arranged inside the central rod body 4 and are evenly distributed along the circumference. The water injection pipes 17 are connected to an external high-pressure air pump 19, which can use high pressure to inject water into the hole and fill all the anchor holes 2 and the cracks 6. An anti-backflow device 18 is provided in the water injection pipe 17 to prevent the rapid backflow of water after the device stops running and cause damage to the device, and the anti-backflow device 18 can also be used as a pipeline switch.

[0032] The central rod body 4 is fixed to the outside through the threaded section 12 on the threaded inner tray 13 and the high-strength fixing bolts 16, wherein the threaded inner tray 13 is also provided with an emergency air supply hole 11 and a borehole pressure alarm 22, the borehole pressure alarm 22 can monitor the water pressure in the hole in real time, and is triggered when the water pressure exceeds a certain value, at which time the emergency air supply hole 11 will automatically open to balance the air pressure in the hole, and prevent excessive pressure from causing further development of cracks and affecting the detection results. The head of the central rod body 4 is provided with a retractable buffer head 10, which can be freely retracted to prevent the rod body from damaging the anchor hole during the process of penetrating into the anchor hole. The central rod body 4 has a water-induced vibration measuring instrument, a vibration device and a nozzle device regularly arranged along the axis, wherein the nozzle device is a conical nozzle 3, which is connected to the water injection pipe 17 in the hole and is evenly distributed along the circumference, and can spray water evenly in the entire circumferential direction. The vibration device is a vibration rod 7 attached to the outside of the hole, which can vibrate at a fixed frequency after the pores in the anchor hole are filled. The water-induced vibration meter can detect this vibration and collect the vibration data of the water in the crack, as shown in Figures 4(a), 4(b) and 4(c).

[0033] An annular tray 17 is also provided outside the threaded inner tray 13 , wherein the backing plate 15 of the high-strength fixing bolts 16 is fixed to the annular tray 17 , and the high-strength fixing bolts 16 connect and fasten the threaded inner tray 13 and the annular tray 17 , playing a dual fixing role.

[0034] like Figure 3 As shown, the method and steps of use are as follows: first, drill the anchor hole 2 to the required depth at the pre-marked position of the surrounding rock 1, slowly insert the central rod 4 into the anchor hole 2, and when the retractable buffer head 10 cannot be retracted, it indicates that the end of the anchor hole 2 is reached. Then, the threaded inner tray 13 is pressed against the outer wall of the anchor hole, and connected to the outer annular tray 14 through the pad 15 by the high-strength fixing bolts 16, and the fixing work of the entire device is completed.

[0035] After the fixing work is completed, the water injection pipe 17 is connected to the external high-pressure air pump 19, and the high-pressure air pump 19 is connected to the external water storage tank. After the high-pressure air pump 19 is started, it will drive water to flow from the external water storage device into the water injection pipe 17 inside the rod body. The water in the water injection pipe 17 is evenly sprayed along the circumference through the conical nozzle 3 on the surface of the rod body, and finally fills the entire anchor hole and even the cracks.

[0036] When the water is about to be filled, the water pressure in the hole will continue to increase with the water injection process. When the water pressure exceeds a certain value, the hole pressure alarm 22 will be triggered. At this time, the emergency air supply hole 11 will be opened, and the water injection pressure will be reduced at the same time, and finally a stable state will be reached in the hole.

[0037] After the stable state is reached, the vibrating rod 7 and the water-induced vibration measuring instrument 5 are turned on at the same time. The vibrating rod is controlled by the built-in battery 9, which will drive the water in the pore to vibrate and generate vibration energy. The water-induced vibration measuring instrument can accurately detect the vibration energy of the water in the hole, can sense the energy change in the anchor hole crack, and then convert this energy change into an electrical signal, which is transmitted to the external data processor 20 through the data line 8. The data processor 20 can analyze the vibration information of the hole pressure water, locate the subtle vibration of the water in the anchor hole, and finally generate the position data of the crack in the anchor hole. Through the corresponding data processing and imaging simulation, the position information of each section in the anchor hole is finally drawn to form the final crack image.

[0038] like Figure 6 and Figure 2 As shown, the central rod body 3 is a solid rod body, the main part of the rod body can be deeply inserted into the anchor hole 2, and the end of the rod body is provided with a threaded inner tray 13 and an annular tray 17. When the retractable buffer head 10 touches the bottom of the anchor hole, the rod body can be fixed. The water-induced vibration measuring instrument 5 is connected to a motor 21 and a data line 8. The water-induced vibration measuring instrument 5 is started by the motor 21. Each water-induced vibration measuring instrument is connected to a separate data line 8. These data lines are finally collected and finally connected to the data processor 20.

[0039] like Figure 2 and Figure 7 As shown, the water-induced vibration measuring device as a whole includes a water-induced vibration measuring instrument 5, a vibration device, and a nozzle device. The nozzle device is a conical nozzle 3, which can fully fill the cracks in the hole with water. The vibration device is 3 to 6 vibration rods 7 attached and distributed along the circumference of the outer periphery of the rod body. A rechargeable battery 9 is arranged inside the vibration rod 7 to provide energy for the operation of the vibration rod. The vibration of the vibration rod can excite the vibration of the water in the hole, and the water-induced vibration measuring instrument 5 can sense the vibration energy of the water in the hole and convert this energy into electrical signals, which are transmitted to the external data processor 20 through separately connected data lines. The data processor 20 can process these electrical signals and convert these electrical signals into position data, and finally store them in the form of data files in a searchable location.

[0040] The vibrating rod 7 is a plastic column inclined at 35 to 75 degrees along the rod body. Its soft characteristics prevent the device from causing damage to the anchor hole during the penetration process. When the water pressure reaches a certain level during the injection process, the pore pressure alarm 22 will be triggered. At this time, the emergency air supply hole will be opened to maintain the air pressure in the hole in balance. After the water in the pore is fully injected and reaches a stable state, all vibrating rods 7 are started at the same time through the switch. With the continuous detection of the water-induced vibrator 5 during the vibration process, the data of all cross-sectional information will be converted into electrical signals and transmitted to the data processing instrument outside the rod body by the data line 8. The data processing instrument 20 will analyze and select based on the electrical signals generated by the water-induced vibrator 5, and synthesize the final image of the entire anchor hole according to the cross-sectional position after comprehensive analysis of all data. Finally, the corresponding data processing and imaging simulation technology can be adopted to output the final three-dimensional image of the anchor hole crack.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A water-induced vibration measuring device for a borehole fissure, characterized in that: It comprises a central rod body (4), a water-induced vibration measuring device is arranged on the central rod body (4), a tray system is arranged at the tail of the central rod body (4), and the water-induced vibration measuring device is connected to a pore pressure alarm (22) via a generator (21); The central rod body (4) is provided with four water injection pipes (17) arranged axially at equal intervals. All the water injection pipes (17) at the rear end of the central rod body (4) are connected to a high-pressure air pump (19) through an anti-backflow device (18). The anti-backflow device (18) is used to prevent the rapid backflow of water from damaging the device and can also be used as a pipe switch. The end of the central rod body (4) closes the water injection pipe (17) and is provided with a retractable buffer head (10). The retractable buffer head (10) is used to prevent the central rod body (4) from damaging the anchor hole (2) when it penetrates deeply into the anchor hole (2). The water-induced vibration measuring device as a whole comprises a vibration device, a nozzle device and a water-induced vibration measuring instrument (5) arranged regularly on the outer side of a central rod (4), wherein a plurality of groups of nozzle devices connected to four internal water injection pipes (17) are arranged at intervals on the side wall of the central rod (4), each group of nozzle devices comprises four conical nozzles (3) arranged around the central rod (4) for uniformly spraying water in the entire circumferential direction and fully filling the cracks in the anchor hole (2) with water, and the vibration device is a plurality of groups of vibration devices distributed and arranged at intervals along the circumference of the outer circumference of the central rod (4). Vibrating rods, each group of vibrating rods includes four vibrating rods (7) evenly distributed around a central rod body (4), and all water-induced vibration measuring instruments (5) are connected to a data processing instrument (20) arranged outside the borehole via a data line (8); the water-induced vibration measuring instrument (5) converts the vibration energy of the water in the anchor hole (2) detected into an electrical signal, and transmits the signal to the data processing instrument (20) via the data line (8); the data processing instrument (20) processes the electrical signals and converts the electrical signals into position data, and finally stores the electrical signals in the form of a data file at a searchable location; The tray system comprises a threaded inner tray (13) close to the borehole wall, an annular tray (14) and a pad (15) matched therewith and inverted on the borehole wall, wherein a plurality of high-strength fixing bolts (16) are passed through the annular tray (14) from an opening on the pad (15) and finally fixedly connected with a threaded hole on the threaded inner tray (13) through a threaded end (12) at the end of the high-strength fixing bolt (16), and a plurality of high-strength fixing bolts (16) are installed around a central rod (4) to fix the tray system; wherein the threaded inner tray (13) is also provided with an emergency air supply hole (11) connected to an anchor hole (2) and a borehole pressure alarm (22) for monitoring the water pressure in the borehole.

2. A water-induced vibration measuring device for borehole fractures according to claim 1, characterized in that: The central rod body (3) is a solid rod body. When the retractable buffer head (10) at the end of the central rod body (3) touches the bottom of the anchor hole, the rod body can be fixed. The water-induced vibration measuring instrument (5) is connected to a generator (21) and is powered by the generator (21). Each water-induced vibration measuring instrument is connected to a separate data line (8), and these data lines are finally aggregated and finally connected to a data processor (20).

3. The water-induced vibration measuring device for borehole fissures according to claim 1, characterized in that: The vibrating rod (7) is a plastic columnar body inclined at 35-75 degrees along the rod body direction, and its softness can prevent the device from damaging the anchor hole during the penetration process.

4. The water-induced vibration measuring device for borehole fractures according to claim 1, characterized in that: When the water pressure exceeds the preset value, the pore pressure alarm (22) is triggered. At this time, the emergency air supply hole (11) will automatically open to balance the air pressure in the anchor hole (2) to prevent excessive pressure from causing further development of cracks and affecting the detection results. After the water in the pore is fully injected and reaches a stable state, all vibrating rods (7) are started at the same time. As the water-induced vibrator (5) continues to detect during the vibration process, the data of the cross-sectional information in all anchor holes (2) will be converted into electrical signals and transmitted to the data processor (20) via the data line (8). The data processor (20) will analyze and select based on the electrical signals generated by the water-induced vibrator (5). After comprehensively analyzing all the data, the final image of the entire anchor hole is synthesized according to the cross-sectional position. Finally, the corresponding data processing and imaging simulation technology can be used to output the final three-dimensional image of the anchor hole cracks.

5. The water-induced vibration measuring device for borehole fractures according to claim 1, characterized in that: The vibrating rod (7) is connected to a rechargeable battery (9) for providing energy for the operation of the vibrating rod, wherein the water-induced vibration measuring instrument (5), the vibrating device group and the nozzle device are arranged in a circular manner from the head to the tail of the central rod body (4) according to the arrangement of the vibrating device group, the nozzle device, the water-induced vibration measuring instrument (5), the nozzle device and the vibrating device group.

6. A method for using the water-induced vibration measurement device for drilling fractures according to any one of claims 1 to 3, characterized in that: Here are the steps: First, an anchor hole (2) is drilled to a desired depth at a pre-marked position of the surrounding rock (1), and the central rod (4) is slowly inserted into the anchor hole (2). When the retractable buffer head (10) cannot be retracted, it indicates that the end of the anchor hole (2) has been touched; then, the threaded inner tray (13) is pressed against the outer wall of the anchor hole, and is connected to the outer annular tray (14) through a pad (15) using a plurality of high-strength fixing bolts (16); After the fixing work is completed, the water injection pipe (17) is connected to the external high-pressure air pump (19), and the high-pressure air pump (19) is connected to the external water storage tank. After the high-pressure air pump (19) is started, it will drive water to flow from the external water storage device into the water injection pipe (17) inside the central rod body (4). The water in the water injection pipe (17) is sprayed evenly along the circumference through the conical nozzle (3) on the surface of the central rod body (4), and finally fills the entire anchor hole (2) and even the crack (6); The water pressure in the anchor hole (2) will continue to increase during the water injection process. When the water pressure exceeds a preset value, the pore pressure alarm (22) will be triggered, and the emergency air supply hole (11) will be opened, while the water injection pressure will be reduced, so that the pore pressure in the anchor hole (2) reaches a stable state; After the stable state is reached, the vibrating rod (7) and the water-induced vibration measuring instrument (5) are turned on at the same time. The vibrating rod is controlled by a built-in battery (9) and drives the water in the pore to vibrate and generate vibration energy. The water-induced vibration measuring instrument can accurately detect the vibration energy of the water in the hole, sense the energy change in the anchor hole crack, and then convert this energy change into an electrical signal, which is transmitted to an external data processing instrument (20) through a data line (8). The data processing instrument (20) analyzes the vibration information of the hole pressure water, locates the subtle vibration of the water in the anchor hole, and finally generates the position data of the crack in the anchor hole. Through corresponding data processing and imaging simulation, the position information of each section in the anchor hole is finally drawn to form a final crack image.

Images