High-density cross-hole elastic wave CT method and device

Abstract

The invention discloses a high-density cross-hole elastic wave CT (Computed Tomography) method and device, relates to the technical field of intelligent processing of engineering geological image achievements, and aims to measure the depths of two drill holes and determine the depth range and the detection precision of a detection profile. Determining the number and positions of excitation probes and receiving probes required by the cross-hole seismic wave CT based on the depth range of the detection profile and the detection precision; and the excitation probes are hung on the multiple excitation probe hanging positions of the first mooring rope. According to the high-density cross-hole elastic wave CT method and device, a plurality of excitation probes and receiving probes are designed, any number of probes can be connected with one another and combined into a string, a plurality of corresponding receiving probes are arranged, and the method and device have the advantage that the probes can be connected with one another and combined into a string. In actual work, a proper number of probes can be selected to work cooperatively according to the drilling depth or the position of a target detection area, efficient data collection is achieved, and meanwhile human interference factors are fewer.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent processing of engineering geological image results, and in particular to a high-density cross-hole elastic wave CT method and device. Background Art

[0002] Cross-hole seismic CT technology utilizes the physical differences in seismic wave propagation through different media to image and analyze the subsurface. A signal source is excited between two or more boreholes, and seismic wave signals that have traveled through the subsurface are then received in other boreholes. Because different geological structures (such as rock, soil, cavities, and fracture zones) affect seismic wave propagation speed and amplitude attenuation in varying ways, by analyzing parameters such as the travel time (the time it takes for a seismic wave to travel from the excitation point to the receiving point) and amplitude, and applying specialized inversion algorithms, a 2D or 3D image of the subsurface medium between the boreholes can be reconstructed. This provides a glimpse into the subsurface geological structure, similar to how medical CT scans reveal the internal structure of the human body.

[0003] The data acquisition process of the cross-hole seismic wave CT method is specifically implemented as follows: using two boreholes that are not far apart, the signal source is excited at a certain depth in one borehole, and the signal transmitted through the rock and soil medium between the holes is received at a certain depth in the other borehole. This obtains a pair of rays that penetrate the rock and soil between the boreholes. By moving the depth of the excitation probe and the receiving probe and performing different depth combinations, the ray pair can finally achieve complete coverage of the cross-hole profile.

[0004] Currently, data acquisition using cross-hole elastic wave CT methods is mostly done in a "one-transmit-one-receive" mode or a "one-transmit-multiple-receive" mode, requiring manual adjustment of the excitation probe or receiving probe height, which may not only cause more human interference but also affect data acquisition efficiency.

[0005] The disadvantage of the current technology is that there is only one excitation source, and the height of the excitation source must be manually adjusted each time the ray pair acquisition at that depth is completed. This not only may cause inaccurate depth (affecting the quality of subsequent data processing), but also greatly reduces work efficiency. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a high-density cross-hole elastic wave CT method and device. The following technical solutions are adopted:

[0007] A high-density cross-hole elastic wave CT method comprises the following steps:

[0008] Step 1: Measure the depths of the two boreholes to determine the depth range and detection accuracy of the detection profile. Based on the depth range and detection accuracy, determine the number and locations of the excitation and receiving probes required for cross-hole seismic wave CT.

[0009] Step 2: Mount the excitation probes obtained in step 1 on the multiple excitation probe mounting positions of the first tether rope, and mount the receiving probes obtained in step 2 on the multiple receiving probe mounting positions of the second tether rope;

[0010] Step 3: Winding a first mooring rope around a first fixed pulley, inserting the first mooring rope carrying multiple excitation probes into the first borehole, and securing the first mooring rope so that the multiple excitation probes are located at the excitation probe positions obtained in Step 1; winding a second mooring rope around a second fixed pulley, inserting the second mooring rope carrying multiple receiving probes into the second borehole, and securing the second mooring rope so that the multiple receiving probes are located at the receiving probe positions obtained in Step 1;

[0011] Step 4, setting the working parameters of multiple excitation probes by the computer, including initializing the serial numbers of multiple excitation probes, setting the excitation sequence, excitation energy and intermittent time; setting the working parameters of multiple receiving probes, including initializing the serial numbers of receiving probes;

[0012] Step 5: Start collecting data. The computer sends the working parameters of multiple excitation probes and multiple receiving probes to the acquisition controller. The acquisition controller controls the multiple excitation probes and multiple receiving probes to collect data. Each time, one excitation probe and the corresponding multiple receiving probes are activated for collection. The collected data are transmitted to the computer for storage during the shutdown time. All the excitation probes and the corresponding receiving probes are excited in turn until all the ray pair data of the section to be measured are collected.

[0013] By adopting the above technical solution, the excitation probes can generate seismic waves, and are connected to each other by a first tethered rope, and communicate with the acquisition controller and the computer through a communication cable or wirelessly. The receiving probes can receive seismic waves from the excitation probes, and are connected to each other by a second tethered rope, and communicate with the acquisition controller and the computer through a communication cable or wirelessly.

[0014] In actual work, according to the borehole depth and the required detection accuracy (for the same depth, the more probes and the shorter the connecting cables, the higher the detection accuracy), a corresponding number of small excitation probes and small receiving probes are selected and connected to the control host and computer through connecting cables and communication cables. The length of the communication cable is adjusted so that the small excitation probes and small receiving probes are evenly distributed in the depth range of the corresponding profile to be detected between the boreholes. Then, the working parameters of the excitation probes are set through the computer software, including initializing the small excitation probe serial number, setting the excitation sequence, excitation energy, and intermittent time. The working parameters of the receiving probes also need to be set, including initializing the small receiving probe serial number, setting the filter, synchronizing the probe clock, etc. After completing the above computer settings, data acquisition begins. The computer sends the acquisition parameters to the acquisition controller. The control host controls the excitation probes and receiving probes to perform data acquisition according to the corresponding parameters. Each time, one excitation probe and the corresponding multiple receiving probes are activated for acquisition. During the off time, the data is transmitted to the computer through the connecting cables and communication cables for storage. All excitation probes and corresponding receiving probes are excited in sequence until all ray pair data of the profile to be measured are acquired.

[0015] Compared with the currently commonly used seismic wave CT technology, it has higher data acquisition efficiency and fewer human interference factors.

[0016] Optionally, in step 1, the formula for determining the number of excitation probes and receiving probes is:

[0017] ;

[0018] in is the number of excitation probes, is the number of receiving probes, are the depths of the first and second boreholes, is the detection accuracy, which is determined based on the probe spacing.

[0019] Optionally, the method for determining the positions of the excitation probe and the receiving probe is: the distance between the excitation probe located at the bottom and the bottom of the first borehole is the detection accuracy, and based on the order of the excitation probes, an excitation probe is arranged upward at every detection accuracy distance; the method for determining the position of the receiving probe is consistent with the method for determining the position of the excitation probe.

[0020] Optionally, in step 3, the method for determining the distance between the bottommost excitation probe and the bottom of the first borehole is: installing a wireless laser ranging sensor at the bottom of the bottommost excitation probe, with the sensor head of the wireless laser ranging sensor pointing vertically downward, and when the first tethering rope is inserted into the first borehole, the distance between the bottommost excitation probe and the bottom of the first borehole is determined by receiving the ranging result emitted by the wireless laser ranging sensor.

[0021] By adopting the above technical solution, by installing a wireless laser ranging sensor at the bottom of the lowest excitation probe, the distance between the lowest excitation probe and the bottom of the first borehole can be determined by receiving the ranging result emitted by the wireless laser ranging sensor during the process of slowly lowering the first tethering rope, thereby achieving precise arrangement of the excitation probe and improving the accuracy of the CT results.

[0022] A high-density cross-hole elastic wave CT device is used to implement a high-density cross-hole elastic wave CT method. The device includes multiple excitation probes, multiple receiving probes, a first tethered rope, a second tethered rope, a first fixed pulley, a second fixed pulley, a computer, and a chip-based acquisition controller. The first tethered rope is provided with multiple excitation probe mounting positions, and the second tethered rope is provided with multiple receiving probe mounting positions. The multiple excitation probes are respectively mounted on the multiple excitation probe mounting positions, and the multiple receiving probes are respectively mounted on the multiple receiving probe mounting positions. The first fixed pulley is mounted on one side of the opening of a first borehole, and the second fixed pulley is mounted on one side of the opening of a second borehole. The first tethered rope is wound around the first fixed pulley, and the first tethered rope with the multiple excitation probes mounted is placed into the first borehole. The second tethered rope is wound around the second fixed pulley, and the second tethered rope with the multiple receiving probes mounted is placed into the second borehole. After the multiple receiving probes are positioned at the receiving probe positions obtained in step 1, the second tethered rope is fixed. The multiple excitation probes and the multiple receiving probes are respectively communicatively connected to the computer, and the computer is communicatively connected to the acquisition controller. The acquisition controller controls the execution of the multiple excitation probes and the multiple receiving probes.

[0023] Optionally, a pair of bottom probe position determining devices are also included, one bottom probe position determining device is used to determine the distance between the bottommost excitation probe of the first tethered rope and the bottom of the first borehole, and the other bottom probe position determining device is used to determine the distance between the bottommost receiving probe of the second tethered rope and the bottom of the second borehole.

[0024] Optionally, the bottom probe position determination device includes a wireless laser ranging sensor, a wireless transceiver module and a display, the wireless laser ranging sensor is installed on the shell of the bottom excitation probe or the receiving probe, the sensor head of the wireless laser ranging sensor is vertically downward, and the display is installed on the side of the opening of the first borehole and the second borehole, and the display is communicatively connected to the wireless laser ranging sensor through the wireless transceiver module.

[0025] By adopting the above technical solution, by installing a wireless laser ranging sensor at the bottom of the lowest excitation probe, and of course, a wireless laser ranging sensor can also be installed at the bottom of the tethering rope, the distance between the lowest excitation probe and the bottom of the first borehole can be determined by receiving the ranging result emitted by the wireless laser ranging sensor during the process of slowly lowering the first tethering rope. When analyzing the distance between the excitation probe and the bottom of the first borehole, the distance between the wireless laser ranging sensor and the lowest excitation probe needs to be considered, which can achieve precise arrangement of the excitation probe and improve the accuracy of the CT results.

[0026] Optionally, the multiple excitation probes and the multiple receiving probes are respectively connected to the computer in a communication cable or wireless communication form.

[0027] Optionally, the acquisition controller includes a buffer and a control chip, the buffer is communicatively connected to the computer, the control chip is communicatively connected to the buffer, and respectively controls the execution actions of the multiple excitation probes and the multiple receiving probes.

[0028] Optionally, the control chip is communicatively connected to the multiple excitation probes and the multiple receiving probes via communication cables or wireless communications.

[0029] By adopting the above technical solution, in order to reduce the difficulty of wiring, wireless communication is usually adopted. Wireless communication can be based on 4G, 5G and other technologies, and can also be implemented based on Lora wireless communication technology.

[0030] In summary, the present invention includes at least one of the following beneficial technical effects:

[0031] The present invention can provide a high-density cross-hole elastic wave CT method and device, which is designed with multiple excitation probes and receiving probes. Any number of probes can be connected to each other and combined into a string. Correspondingly, there are also multiple receiving probes, which also have the characteristics of being able to be connected to each other and combined into a string. In actual work, an appropriate number of multiple probes can be selected according to the drilling depth or the location of the target detection area to work together, thereby achieving efficient data collection and reducing human interference factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic structural diagram of a high-density cross-hole elastic wave CT device according to the present invention;

[0033] Figure 2 This is a schematic diagram of the electrical component connection principle of a high-density cross-hole elastic wave CT device of the present invention.

[0034] Explanation of the accompanying symbols: 1. Excitation probe; 2. Receiving probe; 3. First mooring rope; 4. Second mooring rope; 5. First fixed pulley; 6. Second fixed pulley; 71. Wireless laser ranging sensor; 72. Wireless transceiver module; 73. Display; 100. First borehole; 101. Second borehole; 102. Computer; 103. Acquisition controller; 1031. Buffer; 1032. Control chip. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings.

[0036] The embodiments of the present invention disclose a high-density cross-hole elastic wave CT method and device.

[0037] Reference Figure 1 and Figure 2 , Example 1, a high-density cross-hole elastic wave CT method, comprising the following steps:

[0038] Step 1: Measure the depths of two boreholes to determine the depth range and detection accuracy of the detection profile. Based on the depth range and detection accuracy, determine the number and positions of the excitation probes 1 and receiving probes 2 required for cross-hole seismic wave CT.

[0039] Step 2: Mount the excitation probes 1 obtained in step 1 on the multiple excitation probe mounting positions of the first mooring rope 3, and mount the receiving probes 2 obtained in step 2 on the multiple receiving probe mounting positions of the second mooring rope 4;

[0040] Step 3: Winding the first mooring rope 3 around the first fixed pulley 5 and placing the first mooring rope 3 carrying the multiple excitation probes 1 into the first borehole 100, securing the multiple excitation probes 1 at the excitation probe positions obtained in step 1. Winding the second mooring rope 4 around the second fixed pulley 6 and placing the second mooring rope 4 carrying the multiple receiving probes 2 into the second borehole 101, securing the multiple receiving probes 2 at the receiving probe positions obtained in step 1.

[0041] Step 4, setting the working parameters of the multiple excitation probes 1 by the computer 102, including initializing the serial numbers of the multiple excitation probes 1, setting the excitation sequence, excitation energy and intermittent time; setting the working parameters of the multiple receiving probes 2, including initializing the serial numbers of the receiving probes 2;

[0042] Step 5, start collecting data. The computer 102 sends the working parameters of the multiple excitation probes 1 and the multiple receiving probes 2 to the acquisition controller 103. The acquisition controller 103 controls the parameters of the multiple excitation probes 1 and the multiple receiving probes 2 to collect data. Each time, one excitation probe 1 and the corresponding multiple receiving probes are activated for collection, and the collected data are transmitted to the computer 102 for storage during the shutdown time. All the excitation probes 1 and the corresponding receiving probes 2 are excited in turn until all the ray pair data of the section to be measured are collected.

[0043] The excitation probe 1 can generate seismic waves, and they are connected to each other through a first tether rope 3, and communicate with the acquisition controller 103 and the computer 102 through a communication cable or wirelessly. The receiving probe 2 can receive seismic waves from the excitation probe 1, and they are connected to each other through a second tether rope 4, and communicate with the acquisition controller 103 and the computer 102 through a communication cable or wirelessly.

[0044] In actual work, according to the drilling depth and the required detection accuracy (under the same depth, the more probes there are and the shorter the connecting cables are, the higher the detection accuracy will be), select the corresponding number of small excitation probes and small receiving probes, connect them to the control host and the computer through connecting cables and communication cables, adjust the length of the communication cables, so that the small excitation probes and small receiving probes are evenly distributed in the corresponding depth range of the profile to be detected between the boreholes, and then set the working parameters of the excitation probe 1 through the computer 102 software, including initializing the small excitation probe serial number, setting the excitation sequence, excitation energy size, intermittent time, etc., and also need to set the connection cable. The working parameters of the receiving probe 2 include initializing the serial number of the small receiving probe, setting the filter, synchronizing the probe clock, etc. After completing the above settings of the computer 102, data collection begins. The computer 102 sends the collection parameters to the collection controller 103. The control host controls the excitation probe 1 and the receiving probe 2 to collect data according to the corresponding parameters. Each time, one excitation probe 1 and the corresponding multiple receiving probes 2 are activated for collection, and the data are transmitted to the computer through the connecting cable and the communication cable during the shutdown time for storage. All the excitation probes 1 and the corresponding receiving probes 2 are excited in turn until all the ray pair data of the section to be measured are collected.

[0045] Compared with the currently commonly used seismic wave CT technology, it has higher data acquisition efficiency and fewer human interference factors.

[0046] In Example 2, in step 1, the formula for determining the number of excitation probes 1 and receiving probes 2 is:

[0047] ;

[0048] in is the number of excitation probes 1, is the number of receiving probes 2, is the depth of the first borehole 100 and the second borehole 101, is the detection accuracy, which is determined based on the probe spacing.

[0049] In Example 3, the method for determining the positions of the excitation probe 1 and the receiving probe 2 is: the distance between the excitation probe 1 located at the bottom and the bottom of the first borehole 100 is the detection accuracy, and based on the order of the excitation probes 1, an excitation probe 1 is arranged upward at every detection accuracy distance; the method for determining the position of the receiving probe 2 is the same as the method for determining the position of the excitation probe 1.

[0050] In Example 4, in step 3, the method for determining the distance between the bottommost excitation probe 1 and the bottom of the first borehole 100 is: install a wireless laser ranging sensor 71 at the bottom of the bottommost excitation probe 1, with the sensor head of the wireless laser ranging sensor 71 pointing vertically downward. When the first tethering rope 3 is inserted into the first borehole 100, the distance between the bottommost excitation probe 1 and the bottom of the first borehole 100 is determined by receiving the ranging result emitted by the wireless laser ranging sensor 71.

[0051] By installing a wireless laser ranging sensor 71 at the bottom of the lowest excitation probe 1, the distance between the lowest excitation probe 1 and the bottom of the first borehole 100 can be determined by receiving the ranging results emitted by the wireless laser ranging sensor 71 during the process of slowly placing the first tethering rope 3, thereby achieving precise arrangement of the excitation probe 1 and improving the accuracy of the CT results.

[0052] Example 5, a high-density cross-hole elastic wave CT device, used to implement a high-density cross-hole elastic wave CT method, the device includes multiple excitation probes 1, multiple receiving probes 2, a first mooring rope 3, a second mooring rope 4, a first fixed pulley 5, a second fixed pulley 6, a computer 102 and a chip-based acquisition controller 103, the first mooring rope 3 is provided with multiple excitation probe mounting positions, the second mooring rope 4 is provided with multiple receiving probe mounting positions, the multiple excitation probes 1 are respectively installed in the multiple excitation probe mounting positions, the multiple receiving probes 2 are respectively installed in the multiple receiving probe mounting positions, the first fixed pulley 5 is installed on the side of the hole mouth of the first borehole 100, and the second fixed pulley 6 is installed On one side of the opening of the second borehole 101, the first mooring rope 3 is wound around the first fixed pulley 5, and the first mooring rope 3 carrying multiple excitation probes 1 is placed into the first borehole 100. The second mooring rope 4 is wound around the second fixed pulley 6, and the second mooring rope 4 carrying multiple receiving probes 2 is placed into the second borehole 101. After the multiple receiving probes 2 are located at the receiving probe positions obtained in step 1, the second mooring rope 4 is fixed. The multiple excitation probes 1 and the multiple receiving probes 2 are respectively communicated with the computer 102, and the computer 102 is communicated with the acquisition controller 103. The acquisition controller 103 controls the execution actions of the multiple excitation probes 1 and the multiple receiving probes 2 respectively.

[0053] Example 6 also includes a pair of bottom probe position determination devices, one bottom probe position determination device is used to determine the distance between the bottommost excitation probe 1 of the first tethering rope 3 and the bottom of the first borehole 100, and the other bottom probe position determination device is used to determine the distance between the bottommost receiving probe 2 of the second tethering rope 4 and the bottom of the second borehole 101.

[0054] Example 7, the bottom probe position determination device includes a wireless laser ranging sensor 71, a wireless transceiver module 72 and a display 73. The wireless laser ranging sensor 71 is installed on the shell of the bottom excitation probe 1 or the receiving probe 2, the sensor head of the wireless laser ranging sensor 71 is vertically downward, and the display 73 is installed on the side of the opening of the first borehole 100 and the second borehole 101. The display 73 is communicated with the wireless laser ranging sensor 71 through the wireless transceiver module 72.

[0055] By installing a wireless laser ranging sensor 71 at the bottom of the bottom excitation probe 1, of course, the wireless laser ranging sensor 71 can also be installed at the bottom of the tethering rope. During the process of slowly placing the first tethering rope 3, the distance between the bottom excitation probe 1 and the bottom of the first borehole 100 can be judged by receiving the ranging result emitted by the wireless laser ranging sensor 71. When analyzing the distance between the excitation probe 1 and the bottom of the first borehole 100, the distance between the wireless laser ranging sensor 71 and the bottom excitation probe 1 needs to be considered. This can achieve accurate arrangement of the excitation probe 1 and improve the accuracy of the CT results.

[0056] In Example 8, a plurality of excitation probes 1 and a plurality of receiving probes 2 are respectively connected to the computer 102 via communication cables or wireless communication.

[0057] In Example 9, the acquisition controller 103 includes a buffer 1031 and a control chip 1032. The buffer 1031 is connected to the computer 102 for communication, and the control chip 1032 is connected to the buffer 1031 for communication, and controls the execution actions of the multiple excitation probes 1 and the multiple receiving probes 2 respectively.

[0058] In Example 10, the control chip 1032 is communicatively connected to the plurality of excitation probes 1 and the plurality of receiving probes 2 via communication cables or wireless communications.

[0059] In order to reduce the difficulty of wiring, wireless communication is usually adopted. Wireless communication can be based on 4G, 5G and other technologies, and can also be implemented based on Lora wireless communication technology.

[0060] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-density cross-hole elastic wave CT method, characterized in that: The following steps are involved: Step 1: Measure the depths of the two boreholes to determine the depth range and detection accuracy of the detection profile, and determine the number and positions of the excitation probes (1) and receiving probes (2) required for cross-hole seismic wave CT based on the depth range and detection accuracy of the detection profile; Step 2, respectively mounting the number of excitation probes (1) obtained in step 1 on a plurality of excitation probe mounting positions of the first mooring rope (3), and respectively mounting the number of receiving probes (2) obtained in step 2 on a plurality of receiving probe mounting positions of the second mooring rope (4); Step 3, by winding the first mooring rope (3) around the first fixed pulley (5), and placing the first mooring rope (3) with multiple excitation probes (1) mounted thereon into the first borehole (100), so that the multiple excitation probes (1) are located at the excitation probe positions obtained in step 1, and then fixing the first mooring rope (3); by winding the second mooring rope (4) around the second fixed pulley (6), and placing the second mooring rope (4) with multiple receiving probes (2) mounted thereon into the second borehole (101), so that the multiple receiving probes (2) are located at the receiving probe positions obtained in step 1, and then fixing the second mooring rope (4); Step 4, setting the working parameters of the multiple excitation probes (1) by the computer (102), including initializing the serial numbers of the multiple excitation probes (1), setting the excitation sequence, excitation energy and interruption time; setting the working parameters of the multiple receiving probes (2), including initializing the serial numbers of the receiving probes (2); Step 5, data collection begins. The computer (102) sends the working parameters of the multiple excitation probes (1) and the multiple receiving probes (2) to the acquisition controller (103). The acquisition controller (103) controls the multiple excitation probes (1) and the multiple receiving probes (2) to collect data. Each time, one excitation probe (1) and the corresponding multiple receiving probes (2) are activated for collection. The collected data are transmitted to the computer (102) for storage within the off time. All the excitation probes (1) and the corresponding receiving probes (2) are sequentially excited until all the ray pair data of the section to be measured are collected.

2. A high-density cross-hole elastic wave CT method according to claim 1, characterized in that: In step 1, the formula for determining the number of excitation probes (1) and receiving probes (2) is: ； in is the number of excitation probes (1), is the number of receiving probes (2), is the depth of the first borehole (100) and the second borehole (101), is the detection accuracy, which is determined based on the probe spacing.

3. The high-density cross-hole elastic wave CT method according to claim 2, characterized in that: The method for determining the positions of the excitation probe (1) and the receiving probe (2) is as follows: the distance between the excitation probe (1) located at the bottom and the bottom of the first borehole (100) is the detection accuracy, and based on the order of the excitation probes (1), an excitation probe (1) is arranged upwards at every detection accuracy distance; the method for determining the position of the receiving probe (2) is consistent with the method for determining the position of the excitation probe (1).

4. A high-density cross-hole elastic wave CT method according to claim 3, characterized in that: In step 3, the method for determining the distance between the bottommost excitation probe (1) and the bottom of the first borehole (100) is as follows: a wireless laser ranging sensor (71) is installed at the bottom of the bottommost excitation probe (1), with the sensor head of the wireless laser ranging sensor (71) pointing vertically downward, and when the first mooring rope (3) is inserted into the first borehole (100), the distance between the bottommost excitation probe (1) and the bottom of the first borehole (100) is determined by receiving the distance measurement result emitted by the wireless laser ranging sensor (71).

5. A high-density cross-hole elastic wave CT device, characterized in that: A high-density cross-hole elastic wave CT method for implementing claim 4, the device comprising a plurality of excitation probes (1), a plurality of receiving probes (2), a first mooring rope (3), a second mooring rope (4), a first fixed pulley (5), a second fixed pulley (6), a computer (102) and a chip-based acquisition controller (103), wherein the first mooring rope (3) is provided with a plurality of excitation probe mounting positions, the second mooring rope (4) is provided with a plurality of receiving probe mounting positions, the plurality of excitation probes (1) are respectively mounted on the plurality of excitation probe mounting positions, the plurality of receiving probes (2) are respectively mounted on the plurality of receiving probe mounting positions, the first fixed pulley (5) is mounted on one side of the hole mouth of the first borehole (100), and the second fixed pulley (6) is mounted on the other side of the hole mouth of the second borehole (101). On one side of the hole mouth, a first mooring rope (3) is wound around a first fixed pulley (5), and the first mooring rope (3) carrying a plurality of excitation probes (1) is placed in a first borehole (100), a second mooring rope (4) is wound around a second fixed pulley (6), and the second mooring rope (4) carrying a plurality of receiving probes (2) is placed in a second borehole (101), and the second mooring rope (4) is fixed after the plurality of receiving probes (2) are positioned at the receiving probe positions obtained in step 1, and the plurality of excitation probes (1) and the plurality of receiving probes (2) are respectively connected to a computer (102), and the computer (102) is connected to an acquisition controller (103), and the acquisition controller (103) controls the execution actions of the plurality of excitation probes (1) and the plurality of receiving probes (2).

6. The high-density cross-hole elastic wave CT device according to claim 5, characterized in that: The invention also includes a pair of bottom probe position determining devices, one bottom probe position determining device is used to determine the distance between the bottommost excitation probe (1) of the first mooring rope (3) and the bottom of the first borehole (100), and the other bottom probe position determining device is used to determine the distance between the bottommost receiving probe (2) of the second mooring rope (4) and the bottom of the second borehole (101).

7. The high-density cross-hole elastic wave CT device according to claim 6, characterized in that: The bottom probe position determination device comprises a wireless laser ranging sensor (71), a wireless transceiver module (72) and a display (73), wherein the wireless laser ranging sensor (71) is mounted on the housing of the bottommost excitation probe (1) or the receiving probe (2), the sensing head of the wireless laser ranging sensor (71) is vertically downward, and the display (73) is mounted on the side of the opening of the first borehole (100) and the second borehole (101), and the display (73) is communicatively connected to the wireless laser ranging sensor (71) via the wireless transceiver module (72).

8. The high-density cross-hole elastic wave CT device according to claim 6, characterized in that: The plurality of excitation probes (1) and the plurality of receiving probes (2) are respectively connected to the computer (102) in a communication cable or wireless communication manner.

9. The high-density cross-hole elastic wave CT device according to claim 6, characterized in that: The acquisition controller (103) includes a buffer (1031) and a control chip (1032), wherein the buffer (1031) is communicatively connected to the computer (102), and the control chip (1032) is communicatively connected to the buffer (1031), and respectively controls the execution actions of the plurality of excitation probes (1) and the plurality of receiving probes (2).

10. The high-density cross-hole elastic wave CT device according to claim 9, characterized in that: The control chip (1032) is communicatively connected to the plurality of excitation probes (1) and the plurality of receiving probes (2) respectively via communication cables or wireless communications.

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