CN-121978216-A - Acoustic wave testing device and method suitable for broken rock drilling

CN121978216ACN 121978216 ACN121978216 ACN 121978216ACN-121978216-A

Abstract

The invention discloses an acoustic wave testing device and method suitable for broken rock drilling, comprising an outer barrel, an acoustic wave transmitting probe, an acoustic wave receiving probe, two inflatable sealing discs and an inflatable exhaust mechanism, wherein the center of the outer barrel is provided with a mounting cavity, the acoustic wave transmitting probe is mounted in the mounting cavity, the acoustic wave receiving probe is mounted in the mounting cavity, the two inflatable sealing discs are mounted on the periphery of the outer barrel and are respectively positioned at the upper end and the lower end of the outer barrel, the inflatable sealing discs can be inflated to expand the periphery to be in sealing contact with a hole wall, and the inflatable exhaust mechanism is partially arranged in the mounting cavity in a penetrating mode and is used for inflating or exhausting the inflatable sealing discs. The device adopts two inflatable sealing discs which are respectively arranged at the upper end and the lower end of the outer cylinder, after the inflatable sealing discs are inflated by the inflatable exhaust mechanism, the peripheries of the inflatable sealing discs can be uniformly expanded and are tightly attached to the irregular hole walls of the broken rock mass, and a closed test space is formed between the two inflatable sealing discs. Interference of the acoustic wave signals in the propagation process is reduced, and quality of signal acquisition and reliability of test results are improved.

Inventors

HONG ZHIXIAN
XIE LUNHUA
TAO MING
FENG SHURONG
SHEN XIN
FU XIAOHU
ZHAO HUATAO
XIE TONG
ZHANG CHENGRUI
ZHU ZHONGYUAN

Assignees

中国电建集团中南勘测设计研究院有限公司
中南大学
西南石油大学

Dates

Publication Date: 20260505
Application Date: 20251211

Claims (10)

1. An acoustic testing device suitable for broken rock mass drilling, comprising: an outer cylinder (100), the center of which is provided with a mounting cavity (110); an acoustic wave transmitting probe (200) mounted to the mounting cavity (110); An acoustic wave receiving probe (300) mounted to the mounting chamber (110); the two inflatable sealing discs (400) are arranged on the periphery of the outer cylinder (100), the two inflatable sealing discs (400) are respectively positioned at the upper end and the lower end of the outer cylinder (100), and the inflatable sealing discs (400) can be inflated to expand the periphery to be in sealing contact with the hole wall; and the inflation and exhaust mechanism (500) is partially arranged in the mounting cavity (110) in a penetrating way and is used for inflating or exhausting the inflation sealing disc (400).
2. The acoustic testing device for broken rock mass drilling according to claim 1, further comprising an auxiliary supporting structure (600), wherein the auxiliary supporting structure (600) is arranged around the outer cylinder (100), the auxiliary supporting structure (600) is arranged between the two inflatable sealing discs (400) and the upper end and the lower end of the auxiliary supporting structure are respectively propped against the two inflatable sealing discs (400).
3. Acoustic testing device adapted for broken rock mass drilling according to claim 2, characterized in that the length of the auxiliary support structure (600) is telescopically adjustable.
4. A sonic testing apparatus adapted for use in breaking rock mass drilling as claimed in claim 3, characterised in that the auxiliary support structure (600) is movable in a radial direction of the outer barrel (100) to adjust the position.
5. The acoustic wave testing device for broken rock mass drilling according to claim 2, further comprising two inner sleeve discs (700), wherein the two inner sleeve discs (700) are slidably sleeved on the outer cylinder (100) and are positioned between the two inflatable sealing discs (400), the auxiliary supporting structure (600) is arranged between the two inner sleeve discs (700), and the upper end and the lower end of the auxiliary supporting structure (600) are respectively propped against the two inner sleeve discs (700).
6. The acoustic testing device for broken rock mass drilling according to claim 5, wherein two inner sleeves (700) are provided with radial tracks (710) on opposite sides, and sliding blocks (610) embedded in the radial tracks (710) are respectively provided at upper and lower ends of the auxiliary supporting structure (600), and the sliding blocks (610) can slide along the radial tracks (710).
7. The acoustic wave testing device suitable for broken rock mass drilling according to claim 1, wherein the periphery at the upper end and the lower end of the outer barrel (100) is provided with an annular groove (120), the inner wall of the annular groove (120) is provided with two through holes (121) communicated with the installation cavity (110), the through holes (121) of the upper end and the lower end of the annular groove (120) are circumferentially staggered, the inner periphery of the inflatable sealing disc (400) is embedded into the corresponding annular groove (120), the inner periphery of the inflatable sealing disc (400) is provided with two connecting pipe heads (410), the two connecting pipe heads (410) are respectively arranged in the corresponding two through holes (121) in a penetrating mode, the inflatable exhaust mechanism (500) comprises two vent pipes (510), each vent pipe (510) comprises a butt joint (511) communicated with the connecting pipe head (410) and an extension pipe (512) which extends vertically and is communicated with the butt joint pipe head (511), and the extension pipe (512) extends out of the installation cavity (110).
8. The acoustic testing device for broken rock mass drilling according to claim 7, further comprising a central mounting cylinder (800), wherein the central mounting cylinder (800) is inserted into the center of the mounting cavity (110), the acoustic transmitting probe (200) and the acoustic receiving probe (300) are both mounted on the central mounting cylinder (800), the vent pipe (510) is located at the periphery of the central mounting cylinder (800), the peripheral wall of the central mounting cylinder (800) is in contact with the end part of the butt joint pipe head (511) to limit the butt joint pipe head (511) to be pulled out of the connecting pipe head (410), an end cover (820) is arranged at the bottom of the central mounting cylinder (800), a section of threaded connecting section (830) is arranged at the upper end of the end cover (820), the threaded connecting section (830) is in threaded connection with the peripheral wall at the bottom of the mounting cavity (110), the upper end of the outer cylinder (100) is detachably connected with an axially outer limit ring (130), the bottom surface of the axially outer limit ring (130) is in contact with an upper inflatable sealing disc (400), a limit cylinder (820) is arranged at the periphery of the end cover (820), and the upper end surface (840) is in contact with the lower end face of the inflatable disc (840) and is in threaded connection with the lower end (840) of the outer cylinder (400).
9. The acoustic testing device for broken rock mass drilling according to claim 1, wherein the inflatable sealing disc (400) is provided with a resilient skirt (420) at its periphery.
10. The acoustic testing method suitable for the broken rock drilling is characterized by comprising the following steps of: drilling a test hole in the test area; The outer cylinder (100) is inserted into the test hole with the sound wave transmitting probe (200), the sound wave receiving probe (300) and the inflatable sealing disc (400) in an uninflated state, so that the inflatable sealing disc (400) below is positioned at a preset depth; the two inflatable sealing discs (400) are inflated through the inflation and exhaust mechanism (500), so that the tightness of the test hole is ensured; starting an acoustic wave transmitting probe (200), and acquiring and recording test data by an acoustic wave receiving probe (300); after data acquisition is completed, the two inflatable sealing discs (400) are exhausted through an inflatable exhaust mechanism (500), so that the rubber disc is restored to the original state, and the device is taken out of the test hole.

Description

Acoustic wave testing device and method suitable for broken rock drilling Technical Field The invention relates to the technical field of geotechnical engineering test, in particular to a sound wave testing device and method suitable for broken rock drilling. Background In the field of geotechnical engineering investigation and quality evaluation, the acoustic wave test technology has become one of core means for judging the integrity of rock mass, dividing the quality grade of rock mass and evaluating the stability of foundation by virtue of the advantages of no damage and high efficiency. The core principle of the technology is that an elastic wave is excited by an acoustic wave transmitting probe, a signal is captured by a receiving probe after the acoustic wave is transmitted by a rock mass, and then the mechanical property and structural characteristics of the rock mass are inverted by analyzing parameters such as the transmission speed, the amplitude and the like of the acoustic wave, wherein the effective coupling of the acoustic wave between the probe and the rock mass is a key premise for guaranteeing the testing precision. However, in engineering scenarios involving broken bedrock, such as tunnel excavation, slope management, etc., traditional acoustic testing techniques face a bottleneck that is difficult to break through. Broken rock mass generally has the characteristics of loose stratum structure, joint crack development and high porosity, so that the test hole wall drilled in the rock mass is extremely unstable, effective water storage cannot be realized, and serious water seepage and leakage phenomena can occur. The traditional acoustic wave testing device relies on water as an acoustic wave coupling medium, and the problem that a test hole cannot store water directly leads to the blockage of acoustic wave propagation between a probe and a hole wall, so that signal attenuation is severe, and the acquisition quality of acoustic wave signals and the reliability of test results are greatly influenced. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the acoustic wave testing device suitable for the drilling of the broken rock mass. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The acoustic wave testing device suitable for broken rock drilling comprises an outer barrel, an acoustic wave transmitting probe, an acoustic wave receiving probe, an inflatable sealing disc and an inflatable exhaust mechanism, wherein a mounting cavity is arranged in the center of the outer barrel, the acoustic wave transmitting probe is mounted in the mounting cavity, the acoustic wave receiving probe is mounted in the mounting cavity, the inflatable sealing discs are arranged on the periphery of the outer barrel and are respectively positioned at the upper end and the lower end of the outer barrel, the inflatable sealing discs can be inflated to enable the periphery to expand and be in sealing contact with a hole wall, and the inflatable exhaust mechanism is partially arranged in the mounting cavity in a penetrating mode and is used for inflating or exhausting the inflatable sealing discs. Further, the device also comprises an auxiliary supporting structure, wherein the auxiliary supporting structure is arranged around the outer cylinder, the auxiliary supporting structure is arranged between the two inflatable sealing discs, and the upper end and the lower end of the auxiliary supporting structure are respectively propped against the two inflatable sealing discs. Further, the length of the auxiliary support structure is telescopically adjustable. Further, the auxiliary supporting structure can move the adjusting position along the radial direction of the outer cylinder. The auxiliary support structure is arranged between the two inner sleeve discs, and the upper end and the lower end of the auxiliary support structure are respectively propped against the two inner sleeve discs. Further, radial tracks are arranged on opposite sides of the two inner sleeve discs, sliding blocks embedded into the radial tracks are respectively arranged at the upper end and the lower end of the auxiliary supporting structure, and the sliding blocks can slide along the radial tracks. Further, the periphery at both ends is equipped with the annular groove about the urceolus, the annular groove inner wall is equipped with two and the perforation of installation cavity intercommunication, upper and lower two the perforation circumference stagger of annular groove sets up, the annular groove that corresponds of inflation sealing dish inner circumference embedding, inflation sealing dish inner circumference is equipped with two connecting pipe heads, two the connecting pipe head wears to locate respectively two corresponding perforation, inflation exhaust mechanism includes two bre