A geostress testing device and method for rock mass borehole acoustic information collection

Abstract

The application discloses a geostress testing device and method for rock mass drilling acoustic wave information collection, which comprises an acoustic wave emitting component, an acoustic wave receiving component and an inflation component. The acoustic wave emitting component comprises a first air bag, an acoustic wave emitter arranged on the first air bag and a first traction device connected with the first air bag. The acoustic wave receiving component comprises a second air bag, an acoustic wave receiver arranged on the second air bag and a second traction device connected with the second air bag. The traction device is used for driving the air bags to move to a specified position. The first air bag and the second air bag are connected with the inflation component, so that the acoustic wave emitter and the acoustic wave receiver are in contact with the hole wall. The coupling design of the traction device and the air bag is adopted to drive the movement of the acoustic wave emitter and the acoustic wave receiver, and the acoustic wave emitter and the acoustic wave receiver are closely attached to the hole wall, so that the problem that water needs to be used as a sound wave propagation medium in the hole during the acoustic wave data collection is solved, and the influence of air in the hole on the sound wave propagation is reduced.

Description

Technical Field

[0001] This invention relates to the field of geostress testing technology, and in particular to a geostress testing device and method for acquiring acoustic information from rock boreholes. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, stress relief, hydraulic fracturing, and acoustic emission are commonly used methods for measuring in-situ stress in tunnels. Stress relief records the strain difference caused by stress release before and after stress relief, and calculates the magnitude and direction of stress based on elasticity theory. However, this method requires rock with high integrity, cannot measure deep stress, and is costly. Hydraulic fracturing determines in-situ stress by sealing a section of the borehole and injecting high-pressure fluid into the sealed section to cause the borehole wall to expand and crack. However, this method requires complex instruments and consumes a lot of manpower and resources, so the measured data is also very limited. Acoustic emission requires oriented rock samples to be retrieved from the original rock and measured in a laboratory, and cannot provide real-time on-site measurements.

[0004] To address the shortcomings of existing tunnel in-situ stress measurement methods, a method for estimating in-situ stress based on acoustic wave information and drilling rig parameters is proposed. This method calculates wave velocity and performs elliptic regression analysis based on the collected borehole acoustic wave data, and uses the optimal fitted wave velocity ellipse and drilling rig parameters to estimate the in-situ stress state.

[0005] However, this method requires filling the borehole with water and placing the sound wave transmitter and receiver in the water, making the water the medium for sound wave propagation. In rock masses with many fissures, the water in the borehole will quickly run out, making it impossible to carry out the experiment smoothly. At the same time, even if this method is free from dependence on water, it will still be affected by the air in the borehole, resulting in inaccurate data. Summary of the Invention

[0006] To address the aforementioned issues, this invention proposes a geostress testing device and method for acquiring acoustic information from rock boreholes. It employs a coupling design of a traction device and an airbag to move the acoustic transmitter and receiver, ensuring they are in close contact with the borehole wall. This solves the problem of needing water as the acoustic wave propagation medium during data acquisition and reduces the impact of air in the borehole on acoustic wave propagation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a geostress testing device for collecting acoustic information from rock boreholes, comprising: an acoustic wave emitting component, an acoustic wave receiving component, and an air-filled component; wherein the acoustic wave emitting component and the acoustic wave receiving component are disposed inside the borehole;

[0009] The acoustic emission assembly includes a first airbag, an acoustic emitter disposed on the first airbag, and a first traction device connected to the first airbag; the first traction device is used to move the first airbag to a designated position.

[0010] The sound wave receiving component includes a second airbag, a sound wave receiver disposed on the second airbag, and a second traction device connected to the second airbag; the second traction device is used to move the second airbag to a designated position.

[0011] Both the first and second airbags are connected to the inflation assembly so that the sound wave transmitter and the sound wave receiver come into contact with the hole wall.

[0012] As an alternative implementation, the boreholes are two horizontal boreholes on the same horizontal plane, with the acoustic wave emitting component and the acoustic wave receiving component respectively disposed in the two horizontal boreholes.

[0013] As an alternative implementation, multiple acoustic transmitters are detachably mounted on one side of the first airbag at a certain interval, and multiple acoustic receivers are detachably mounted on one side of the second airbag at a certain interval.

[0014] As an alternative implementation, the first traction device and the second traction device have the same structure, both including a circular iron plate, a pulley provided on the circular iron plate, and a motor that controls the rotation of the pulley to drive the sound wave transmitter and the sound wave receiver to move inside the borehole.

[0015] As an alternative implementation, the inflation assembly is located outside the borehole, and both the first airbag and the second airbag are connected to an inflation assembly.

[0016] As an alternative implementation, the inflation assembly includes a pressure piston, a pressure gauge, an inflation pump, and a rubber tube; the inflation pump is connected to a first airbag or a second airbag via the rubber tube, and the rubber tube is equipped with a pressure piston for adjusting the air pressure and a pressure gauge for monitoring the air pressure value.

[0017] As an alternative implementation, the ground stress testing device also includes a control terminal, which is wirelessly connected to the acoustic transmitter and receiver to control the operating status of the acoustic transmitter and receiver and to receive acoustic information collected by the acoustic receiver.

[0018] As an alternative implementation, the control terminal sequentially controls each sound wave transmitter to emit sound waves and controls all sound wave receivers to receive sound waves, so as to record the sound wave information collected by the sound wave receivers at different locations.

[0019] As an alternative implementation, the control terminal is connected to the first traction device and the second traction device via a cable, and the sound wave transmitter and the sound wave receiver are brought to a designated position by controlling the start / stop, moving speed and moving distance of the first traction device and the second traction device.

[0020] In a second aspect, the present invention provides a geostress testing method for acquiring acoustic information from rock boreholes, employing the geostress testing device described in the first aspect, comprising:

[0021] The acoustic wave transmitting component and the acoustic wave receiving component are placed in two horizontal boreholes on the same horizontal plane.

[0022] The control unit activates the traction device to move the acoustic transmitter and receiver to the designated position inside the borehole.

[0023] Control the start of the inflation assembly to inflate the airbag, so that the sound wave transmitter and sound wave receiver come into contact with the hole wall;

[0024] Each sound wave transmitter is controlled to emit sound waves in sequence, and all sound wave receivers are controlled to receive sound waves, so as to record the sound wave information collected by the sound wave receivers at different locations.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] This invention proposes a geostress testing device for collecting acoustic information from rock boreholes. The acoustic transmitter and receiver are mounted on an airbag, and a coupling design between the traction device and the airbag is used to move the acoustic transmitter and receiver. This allows the acoustic transmitter and receiver to be distributed at different locations in the borehole, thereby enabling the transmission and reception of acoustic information from different directions at different locations in the borehole, saving data acquisition time.

[0027] This invention proposes a geostress testing device for collecting acoustic information from rock boreholes. By using an airbag to keep the acoustic transmitter and receiver in close contact with the borehole wall, it solves the problem of needing water as the acoustic wave propagation medium in the borehole during acoustic data acquisition, thereby eliminating the dependence of the testing instrument on water and reducing the influence of air in the borehole on the acoustic wave propagation speed.

[0028] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0030] Figure 1 This is a schematic diagram of the geostress testing device for collecting acoustic information from rock boreholes provided in Embodiment 1 of the present invention.

[0031] Figure 2 This is a top view of the acoustic wave emitting component provided in Embodiment 1 of the present invention;

[0032] Figure 3 This is a top view of the acoustic wave receiving component provided in Embodiment 1 of the present invention;

[0033] Figure 4 This is a front view of the traction device provided in Embodiment 1 of the present invention;

[0034] Figure 5 This is a side view of the traction device provided in Embodiment 1 of the present invention;

[0035] Among them, 1. Circular iron sheet, 2. Pulley, 3. Motor, 4. First traction device, 5. Horizontal borehole, 6. Nylon braided rope, 7. Sound wave transmitter, 8. First airbag, 9. Sound wave receiver, 10. Tunnel sidewall, 11. Pneumatic piston, 12. Air pump, 13. Rubber hose, 14. Pressure gauge, 15. Cable, 16. Control terminal, 17. Second traction device, 18. Second airbag. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0040] Example 1

[0041] This embodiment provides a geostress testing device for acquiring acoustic information from rock boreholes, such as... Figure 1 As shown, it includes: a sound wave emitting component, a sound wave receiving component, and an inflation component; the sound wave emitting component and the sound wave receiving component are disposed inside the borehole;

[0042] The acoustic wave emitting assembly includes a first airbag 8, an acoustic wave emitter 7 disposed on the first airbag 8, and a first traction device 4 connected to the first airbag 8; the first traction device 4 is used to move the first airbag 8 to a designated position.

[0043] The sound wave receiving component includes a second airbag 18, a sound wave receiver 9 disposed on the second airbag 18, and a second traction device 17 connected to the second airbag 18; the second traction device 17 is used to move the second airbag 18 to a designated position.

[0044] The first airbag 8 and the second airbag 18 are both connected to the inflation assembly so that the sound wave transmitter 7 and the sound wave receiver 9 come into contact with the hole wall.

[0045] In this embodiment, two horizontal holes 5 are drilled on the tunnel sidewall 10, and the two horizontal holes 5 are on the same horizontal plane. The sound wave emitting component and the sound wave receiving component are respectively located in the two horizontal holes on the same horizontal plane.

[0046] In this embodiment, as Figure 2 As shown, the acoustic wave emitting assembly includes a first airbag 8, an acoustic wave emitter 7 disposed on the first airbag 8, and a first traction device 4 connected to the first airbag 8.

[0047] Multiple acoustic transmitters 7 are detachably installed at certain intervals on one side of the first airbag 8 so that they can be replaced when the acoustic transmitters 7 or the first airbag 8 are damaged; when the first traction device 4 moves, it drives the first airbag 8 and the acoustic transmitters 7 to move together.

[0048] As an alternative implementation, the acoustic transmitter 7 is bound to one side of the first airbag 8 using a nylon braided rope.

[0049] As an alternative implementation, the first airbag 8 and the first traction device 4 are connected by a nylon braided rope.

[0050] In this embodiment, as Figure 3 As shown, the sound wave receiving assembly includes a second airbag 18, a sound wave receiver 9 disposed on the second airbag 18, and a second traction device 17 connected to the second airbag 18.

[0051] Multiple acoustic receivers 9 are detachably installed at certain intervals on one side of the second airbag 18 so that they can be replaced when the acoustic receivers 9 or the second airbag 18 are damaged; when the second traction device 17 moves, it drives the second airbag 18 and the acoustic receivers 9 to move together.

[0052] As an alternative implementation, the sound wave receiver 9 is bound to one side of the second airbag using a nylon braided rope.

[0053] As an alternative implementation, the second airbag 18 and the second traction device 17 are connected by a nylon braided rope.

[0054] In this embodiment, the first traction device and the second traction device have the same structure, such as... Figures 4-5 As shown, each includes a circular iron plate 1, a pulley 2 mounted on the circular iron plate 1, and a motor 3 that controls the rotation of the pulley to drive the sound wave transmitter and the sound wave receiver to move inside the borehole.

[0055] In this embodiment, the inflation assembly is located outside the borehole. The first airbag and the second airbag are both connected to an inflation assembly, which specifically includes a pressure piston 11, a pressure gauge 14, an inflation pump 12, and a rubber tube 13. The inflation pump 12 is connected to the airbag through the rubber tube 13. The rubber tube 13 is equipped with a pressure piston 11 and a pressure gauge 14. By starting the inflation pump 12, air is inflated into the airbag. At the same time, the pressure inside the airbag is prevented from becoming too high according to the pressure value of the pressure gauge 14. If the pressure is too high, the pressure is reduced by adjusting the pressure piston 11.

[0056] In this embodiment, the device further includes a control terminal 16, which is wirelessly connected to the sound wave transmitter 7 and the sound wave receiver 9 to control the working state of each sound wave transmitter 7 and the sound wave receiver 9 and to receive and store the sound wave information collected by each sound wave receiver 9.

[0057] The control terminal 16 is connected to the first traction device 4 and the second traction device 17 via a cable 15 to control the working status of the two traction devices.

[0058] In this embodiment, the control module receives drilling information such as borehole number, borehole diameter, borehole depth, and distance between two boreholes. By controlling the start, stop, speed, and distance of the two traction devices, the traction devices drive the airbag, acoustic transmitter, or acoustic receiver to the designated position. The module also performs operations such as pre-collection, start collection, pause, and completion of acoustic information collection. After the acoustic information collection is completed, it is stored and can be transmitted to other devices via wireless transmission or other means.

[0059] Example 2

[0060] This embodiment provides a method for operating a geostress testing device for acquiring acoustic information from rock boreholes, including:

[0061] Two horizontal holes are drilled in the tunnel sidewall, and the two horizontal holes are on the same horizontal plane.

[0062] The first traction device is connected to the first inflatable airbag using a nylon braided rope, the sound wave transmitter is connected to the first inflatable airbag using a nylon braided rope, the second traction device is connected to the second inflatable airbag using a nylon braided rope, and the sound wave receiver is connected to the second inflatable airbag using a nylon braided rope. At this time, the two inflatable airbags are in an uninflated state.

[0063] Connect the two inflatable airbags to the inflation assembly respectively, connect the two traction devices to the control terminal via cables, and connect the sound wave transmitter and sound wave receiver to the control terminal wirelessly.

[0064] Both the acoustic wave transmitting component and the acoustic wave receiving component are placed inside a horizontal borehole.

[0065] Start the sound wave transmitter, control its working status through the control terminal, and control the first traction device to move the sound wave transmitter and the first airbag into the hole until they reach the designated position; start the air pump to inflate the first airbag, and at the same time, prevent the air pressure in the first airbag from becoming too high according to the air pressure value of the air pressure gauge; if the air pressure is too high, reduce the pressure by adjusting the air pressure piston.

[0066] Start the sound wave receiver, control the working status of the sound wave receiver through the control terminal, and control the second traction device to move the sound wave receiver and the second airbag into the hole until they reach the designated position; start the air pump to inflate the second airbag, and at the same time, prevent the air pressure in the second airbag from becoming too high according to the air pressure value of the air pressure gauge; if the air pressure is too high, reduce the pressure by adjusting the air pressure piston.

[0067] The control terminal receives and saves the input information such as borehole number, borehole diameter, borehole depth, and distance between two boreholes;

[0068] Each sound wave transmitter is selected sequentially for pre-sampling. If the waveform does not meet the requirements, adjustments are made until it does. Since there are multiple sound wave transmitters and multiple sound wave receivers, only one sound wave transmitter emits sound waves during a single sound wave information acquisition, while all sound wave receivers receive the sound waves and record the sound wave information acquired by the sound wave receivers at different locations. Once the sound wave information emitted by one sound wave transmitter has been acquired, the next sound wave transmitter begins to emit sound waves, and all sound wave receivers receive the sound waves, and so on.

[0069] After collecting all the sound wave information emitted by the sound wave transmitters, the recorded sound wave information is saved and can be transmitted to other devices for viewing or processing via wired or wireless means.

[0070] After the acoustic information is collected, the air in the airbag is released and the equipment in the horizontal borehole is removed. Do not use too much force during the removal process to prevent damage to the instrument. After the equipment is removed, disassemble it and store it.

[0071] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A geostress testing device for acquiring acoustic information from rock boreholes, characterized in that, include: Sound wave emitting component, sound wave receiving component, and inflation component; The acoustic wave emitting component and the acoustic wave receiving component are disposed inside the borehole; the borehole consists of two horizontal boreholes on the same horizontal plane, and the acoustic wave emitting component and the acoustic wave receiving component are respectively disposed inside the two horizontal boreholes; The acoustic emission assembly includes a first airbag, an acoustic emitter disposed on the first airbag, and a first traction device connected to the first airbag; the first traction device is used to move the first airbag to a designated position. The sound wave receiving component includes a second airbag, a sound wave receiver disposed on the second airbag, and a second traction device connected to the second airbag; the second traction device is used to move the second airbag to a designated position. Both the first and second airbags are connected to the inflation assembly so that the sound wave transmitter and the sound wave receiver come into contact with the hole wall; Multiple sound wave transmitters are detachably installed at a certain interval on one side of the first airbag, and multiple sound wave receivers are detachably installed at a certain interval on one side of the second airbag. The first traction device and the second traction device have the same structure, both including a circular iron plate, a pulley on the circular iron plate, and a motor that controls the rotation of the pulley to drive the sound wave transmitter and the sound wave receiver to move inside the borehole. The ground stress testing device also includes a control terminal, which is wirelessly connected to the acoustic transmitter and the acoustic receiver to control the working status of the acoustic transmitter and the acoustic receiver and to receive the acoustic information collected by the acoustic receiver. The control terminal is connected to the first traction device and the second traction device via a cable. By controlling the start / stop, moving speed and moving distance of the first traction device and the second traction device, the sound wave transmitter and the sound wave receiver can reach the designated position.

2. The geostress testing device for acquiring acoustic information from rock boreholes as described in claim 1, characterized in that, The inflation assembly is located outside the borehole, and the first airbag and the second airbag are both connected to an inflation assembly.

3. The geostress testing device for acquiring acoustic information from rock boreholes as described in claim 1, characterized in that, The inflation assembly includes a pressure piston, a pressure gauge, an inflation pump, and a rubber tube; the inflation pump is connected to the first airbag or the second airbag via the rubber tube, and the rubber tube is equipped with a pressure piston for adjusting the air pressure and a pressure gauge for monitoring the air pressure value.

4. The geostress testing device for acquiring acoustic information from rock boreholes as described in claim 1, characterized in that, The control terminal sequentially controls each sound wave transmitter to emit sound waves and controls all sound wave receivers to receive sound waves, so as to record the sound wave information collected by the sound wave receivers at different locations.

5. A method for testing in-situ stress using acoustic information acquisition from rock boreholes, characterized in that, The geostress testing apparatus according to any one of claims 1-4 comprises: The acoustic wave transmitting component and the acoustic wave receiving component are placed in two horizontal boreholes on the same horizontal plane. The control activates the first and second traction devices to move the acoustic transmitter and receiver to the designated position inside the borehole. The control unit is activated to inflate the first and second airbags, causing the sound wave transmitter and receiver to contact the hole wall. Each sound wave transmitter is controlled to emit sound waves in sequence, and all sound wave receivers are controlled to receive sound waves, so as to record the sound wave information collected by the sound wave receivers at different locations.

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