Ultrasonic non-destructive real-time monitoring method for surrounding rock hazards in underground engineering

Abstract

The invention relates to an underground engineering wall surrounding rock disaster non-drilling ultrasonic wave lossless real-time monitoring method which is characterized by comprising a non-metal ultrasonic wave detecting instrument (1), an energy converter (11), a coupling fixing device (4), a main control computer (5) and a sound-light alarm device (6), wherein the transducer (11) is fixed on the surface of a surrounding rock (7) through the coupling fixing device (4), and the transducer (11) is connected with the non-metal ultrasonic wave detecting instrument (1) through an electric cable; the non-metal ultrasonic wave detecting instrument (1) is connected with the main control computer (5); the main control computer (5) is connected with the sound-light alarm device (6). The method disclosed by the invention can be used for monitoring the inside of the surrounding rock (7) by adopting an ultrasonic pulse reflection echo method without drilling the surrounding rock (7), is very simple in coupling process and has the advantages of high detection sensitivity, accuracy in defect positioning, convenience in operation, wide application range and the like.

Description

technical field [0001] The invention discloses a non-drilling ultrasonic non-destructive real-time monitoring method for surrounding rock hazards in underground engineering, which belongs to the technical field of mining and geotechnical engineering safety detection and monitoring. It specifically relates to a non-drilling ultrasonic non-destructive real-time monitoring method for surrounding rock disasters in underground engineering, which uses the ultrasonic pulse reflection echo method to monitor the interior of the surrounding rock, and at the same time, when the monitoring probe is arranged, the probe can be fixed without destroying the surrounding rock. . Background technique [0002] Underground engineering and mines have risks such as surrounding rock slabs, floor drums, roof caving, and rockburst dynamic disasters, among which roof caving or roof accidents are the most prominent, which pose a direct threat to staff and equipment, and affect the progress of the proje...

AI Technical Summary

Problems solved by technology

At present, the surrounding rock monitoring mainly includes surrounding rock deformation monitoring (which can be subdivided into surface displacement monitoring, roof separation layer and loose range monitoring), roadway support load monitoring, stress monitoring of roadway surrounding rock, and real-time dynamic monitoring developed for the above monitoring. Instruments and equipment such as roof dynamic monitoring system, roof online monitoring system, etc., simple monitoring of surrounding rock displacement, support pressure monitoring and stress monitoring are difficult to truly reflect the changes inside the surrounding rock, that is, the damage evolution, so the monitoring and early warning effects are not ideal Accidents on the roof of the surrounding rock still account for a large proportion of accidents. For the acoustic emission monitoring of the surrounding rock, the installation and monitoring process is relatively cumbersome and expensive, and the requirements for the entire installation quality are also high. The post-analysis of monitoring data is complicated and inconvenient. , the actual use effect is not ideal, it is necessary to explore new effective monitoring and early warning technology

[0004] Ultrasonic transmission method has a very sensitive response to changes in the internal density of rock mass, internal defects, and cracks. It can reflect the internal changes of surrounding rocks, that is, the damage evolution. In this method, the surrounding rock must be drilled, and then ultrasonic testing is performed in the hole, and water is required as a coupling agent. The installation and testing process is cumbersome and not suitable for long-term monitoring. At the same time, the drilling process will also cause damage to the surrounding rock and affect the test results.

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