CN-117072147-B - Ground stress testing device and method for acoustic wave information acquisition of rock mass drilling

CN117072147BCN 117072147 BCN117072147 BCN 117072147BCN-117072147-B

Abstract

The invention discloses a ground stress testing device and a ground stress testing method for acoustic information acquisition of rock drilling, wherein the ground stress testing device comprises an acoustic emission component, an acoustic receiving component and an inflation component; the sound wave transmitting assembly comprises a first air bag, a sound wave transmitter arranged on the first air bag and a first traction device connected with the first air bag, the sound wave receiving assembly comprises a second air bag, a sound 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 bag to move to a specified position, and the first air bag and the second air bag are connected with the air inflation assembly so that the sound wave transmitter and the sound 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 sound wave emitter and the sound wave receiver to move, the sound wave emitter and the sound wave receiver are clung to the hole wall, the problem that water is needed to be used as a sound wave propagation medium in the hole during sound wave data acquisition is solved, and the influence of air in a drilling hole on sound wave propagation is reduced.

Inventors

SHI SHAOSHUAI
YANG SHIJIE
ZHAO RUIJIE
GUO WEIDONG
XIAO XI

Assignees

山东大学
中国国家铁路集团有限公司

Dates

Publication Date: 20260505
Application Date: 20230911

Claims (5)

1. The ground stress testing device for acoustic information acquisition of rock mass drilling is characterized by comprising an acoustic wave transmitting assembly, an acoustic wave receiving assembly and an inflation assembly, wherein the acoustic wave transmitting assembly and the acoustic wave receiving assembly are arranged in a drilling hole, the two horizontal drilling holes are positioned on the same horizontal plane, and the acoustic wave transmitting assembly and the acoustic wave receiving assembly are respectively arranged in the two horizontal drilling holes; The sound wave emission assembly comprises a first air bag, a sound wave emitter arranged on the first air bag and a first traction device connected with the first air bag, wherein the first traction device is used for driving the first air bag to move to a designated position; The sound wave receiving assembly comprises a second air bag, a sound wave receiver arranged on the second air bag and a second traction device connected with the second air bag, wherein the second traction device is used for driving the second air bag to move to a designated position; the first air bag and the second air bag are connected with the inflation assembly so that the sound wave transmitter and the sound wave receiver are in contact with the hole wall; The plurality of sound wave transmitters are detachably arranged at one side of the first air bag at certain intervals, and the plurality of sound wave receivers are detachably arranged at one side of the second air bag at certain intervals; The first traction device and the second traction device have the same structure and comprise a circular iron sheet, a pulley arranged on the circular iron sheet and a motor for controlling the pulley to rotate so as to drive the sound wave transmitter and the sound wave receiver to move in the drill hole; The ground stress testing device further comprises a control terminal which is in wireless connection with the sound wave transmitter and the sound wave receiver so as to control the working state of the sound wave transmitter and the sound wave receiver and receive sound wave information acquired by the sound wave receiver; The control terminal is connected with the first traction device and the second traction device through cables, and the sound wave transmitter and the sound wave receiver reach the designated positions by controlling the starting and stopping speed, the moving speed and the moving distance of the first traction device and the second traction device.
2. The device for testing the ground stress for acoustic information acquisition of a rock mass drilling hole according to claim 1, wherein the inflation assembly is arranged outside the drilling hole, and the first air bag and the second air bag are connected with one inflation assembly.
3. The ground stress testing device for acoustic wave information acquisition of rock mass drilling according to claim 1, wherein the inflation assembly comprises an air pressure piston, an air pressure gauge, an inflator pump and a rubber tube, the inflator pump is connected with the first air bag or the second air bag through the rubber tube, and the air pressure piston for adjusting air pressure and the air pressure gauge for monitoring air pressure values are arranged on the rubber tube.
4. The device for testing the ground stress for acquiring the acoustic information of the rock mass drilling according to claim 1, wherein the control terminal sequentially controls each acoustic transmitter to transmit the acoustic wave and controls all the acoustic receivers to receive the acoustic wave so as to record the acoustic information acquired by the acoustic receivers at different positions.
5. A method for testing the ground stress for acoustic information acquisition of rock mass drilling, characterized in that the ground stress testing device as claimed in any one of claims 1 to 4 is adopted, comprising: the sound wave transmitting assembly and the sound wave receiving assembly are arranged in two horizontal drilling holes on the same horizontal plane; controlling and starting the first traction device and the second traction device to drive the sound wave transmitter and the sound wave receiver to move to a designated position in the drill hole; Controlling the starting inflation assembly to inflate the first and second airbags, so that the sound wave transmitter and the sound wave receiver are in contact with the hole wall; And controlling each sound wave emitter to emit sound waves in sequence, and controlling all sound wave receivers to receive the sound waves so as to record sound wave information acquired by the sound wave receivers at different positions.

Description

Ground stress testing device and method for acoustic wave information acquisition of rock mass drilling Technical Field The invention relates to the technical field of ground stress testing, in particular to a ground stress testing device and method for acoustic wave information acquisition of rock mass drilling. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. At present, a stress relief method, a hydraulic fracturing method and an acoustic emission method are common methods for tunnel ground stress measurement, the stress relief method records a strain difference value generated by stress relief before and after stress relief, stress magnitude and direction are calculated according to an elasticity theory, but the method needs rock with high integrity, deep stress cannot be measured, and the cost is high. Aiming at the defects of the existing tunnel ground stress measurement method, a ground stress estimation method based on acoustic wave information and drilling parameters of a drilling trolley is provided, the method carries out wave velocity calculation and elliptic regression analysis based on acquired drilling acoustic wave data, and the ground stress state estimation is carried out by utilizing the optimal fitting wave velocity ellipse and the drilling parameters of the drilling trolley. However, the method needs to fill water in the drill hole, the sound wave transmitter and the sound wave receiver are placed in the water, so that the water becomes a medium for sound wave propagation, the water in the drill hole can be quickly lost in the rock mass with more cracks, the test cannot be smoothly carried out, and meanwhile, the method is influenced by air in the hole even if the method gets rid of the dependence on the water, so that the acquired data is inaccurate. Disclosure of Invention In order to solve the problems, the invention provides a ground stress testing device and a ground stress testing method for acoustic wave information acquisition of rock mass drilling, which adopt a coupling design of a traction device and an air bag to drive an acoustic wave emitter and an acoustic wave receiver to move, and enable the acoustic wave emitter and the acoustic wave receiver to cling to a hole wall, so that the problem that water is needed to be used as an acoustic wave propagation medium in the hole during acoustic wave data acquisition is solved, and the influence of air in the drilling on acoustic wave propagation is reduced. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention provides a ground stress testing device for acoustic information acquisition of a rock mass drilling hole, which comprises an acoustic wave transmitting assembly, an acoustic wave receiving assembly and an inflation assembly, wherein the acoustic wave transmitting assembly and the acoustic wave receiving assembly are arranged in the drilling hole; The sound wave emission assembly comprises a first air bag, a sound wave emitter arranged on the first air bag and a first traction device connected with the first air bag, wherein the first traction device is used for driving the first air bag to move to a designated position; The sound wave receiving assembly comprises a second air bag, a sound wave receiver arranged on the second air bag and a second traction device connected with the second air bag, wherein the second traction device is used for driving the second air bag to move to a designated position; the first air bag and the second air bag are connected with the inflation assembly so that the sound wave transmitter and the sound wave receiver are in contact with the hole wall. Alternatively, the two horizontal drilling holes are positioned on the same horizontal plane, and the sound wave transmitting component and the sound wave receiving component are respectively arranged in the two horizontal drilling holes. Alternatively, the plurality of acoustic wave transmitters are detachably disposed at a certain interval on one side of the first air bag, and the plurality of acoustic wave receivers are detachably disposed at a certain interval on one side of the second air bag. As an alternative embodiment, the first traction device and the second traction device have the same structure and comprise a circular iron sheet, a pulley arranged on the circular iron sheet and a motor for controlling the pulley to rotate so as to drive the sound wave transmitter and the sound wave receiver to move in the drill hole. Alternatively, the inflation assembly is arranged outside the drill hole, and the first air bag and the second air bag are connected with one inflation assembly. The inflation assembly comprises an air pressure piston, an air pressure gauge, an inflation pump and a rubber tube, wherein the inflation pump is connected with the first air bag or the second a