An acoustic sensor for rockburst monitoring

Abstract

The invention discloses an acoustic sensor for rockburst monitoring, which includes an acoustic emission probe, a probe installation mechanism and a transmission mechanism for transmitting the combination of the acoustic emission probe and the probe installation mechanism to a set position in a borehole of a rock mass to be monitored. The probe installation mechanism is mainly composed of a sleeve assembly, a guide assembly, an end cover and a spring; the guide assembly and the sleeve assembly or end cover are pluggable connections, and the assembled probe installation mechanism locks the acoustic emission probe on the sleeve In the probe sleeve of the assembly, the spring in the elastic sleeve of the sleeve assembly is in a compressed state. The invention realizes the control of the moving direction of the guide assembly and the probe assembly through the pluggable connection and cooperation between the guide assembly and the sleeve assembly or the end cover, and utilizes the elastic restoring force of the spring, thereby solving the problem of the effective detection of the acoustic emission probe. The difficulty of installation and coupling not only facilitates the transmission of the acoustic emission probe, but also ensures the coupling effect between the acoustic emission probe and the borehole wall.

Description

technical field [0001] The invention belongs to the technical field of rock (body) engineering safety monitoring in engineering construction, and relates to an acoustic sensor for rockburst monitoring. Background technique [0002] Rock (body) deformation and damage during engineering construction, especially rockburst dynamic disasters, will directly endanger the safety of the project and even cause catastrophic effects. Therefore, effective monitoring and monitoring of rock (body) stability and rockburst dynamic disasters Forecasting is one of the important contents of engineering safety construction. At present, as an important means of non-destructive monitoring, acoustic emission is used in the monitoring and forecasting of rock (body) stability and rockburst dynamic disasters in engineering construction. [0003] During the excavation and construction of surrounding rocks in underground engineering, in order to accurately predict the possible deformation and damage of...

AI Technical Summary

Problems solved by technology

The use of this device has the following disadvantages: ①Because the distance between the fixed installation device and the wall of the borehole is very close, it is necessary for the fixed installation device and the borehole to be basically concentric in structure, and the wall of the hole needs to be smooth, but these requirements in actual construction Difficult to guarantee; ②Due to the large size of the fixed installation device, it is only suitable for drilling with a large diameter, resulting in an increase in drilling costs; ③The entire transmission rod and installation device are inserted into the drill hole by force and rigidly. Not only is the friction force high, it is easy to wear the cable or the acoustic emission probe, but it is also easy to be stuck in the drill hole and cannot be sent to the place where it needs to be installed; Therefore, the installation process is not only time-consuming and labor-intensive, but also has extremely low work efficiency; ⑤Because the wall of the borehole is a cylindrical surface, and the end face of the acoustic emission probe is a plane, how to ensure that the end face of the acoustic emission probe is effectively coupled with the wall of the borehole is also a problem in practical applications. problem to be solved

[0007] Based on the disadvantages and defects in the above-mentioned various implementation methods, the application and promotion of acoustic emission detection in the monitoring of rock (body) stability and rockburst dynamic disasters is limited to a certain extent.

[0008] Therefore, how to install the acoustic emission probe in the borehole conveniently and effectively, and how to effectively couple the installed acoustic emission probe with the hole wall is still a difficult point in field monitoring and research at present, and there is a lack of relevant testing methods and technical support

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