Sample sealing device and method for testing active and passive real-time acoustic waves in rock breaking process

Abstract

The invention provides a sample sealing device and method for testing active and passive real-time acoustic waves in the rock breaking process, and belongs to the technical field of rock breaking testing. The sample sealing device comprises a load application module, a displacement monitoring module, a load ultrasonic monitoring module and an acoustic emission monitoring and positioning module; the load application module comprises a rigid cushion block and a triaxial electro-hydraulic servo tester; the displacement monitoring module comprises a longitudinal extensometer upper clamp, a longitudinal extensometer lower clamp, extensometer helical wires, extensometer helical wire sleeves, a longitudinal extensometer circular hoop ring and miniature screws; and the load ultrasonic monitoring module comprises ultrasonic probes and U-shaped ultrasonic probes, and the acoustic emission monitoring and positioning module comprises an acoustic emission sensor and an acoustic emission clamping device. According to the sample sealing device, a rock sample is subjected to real-time ultrasonic testing through an acoustic wave instrument and the six ultrasonic probes, rock acoustic emission damage parameters are obtained through an acoustic emission acquisition instrument and eight acoustic emission probes, and the sample sealing device has high laboratory guiding significance.

Description

technical field [0001] The invention relates to the technical field of rock fracture testing, in particular to an active and passive real-time sound wave testing and sealing device and method for rock fracture process. Background technique [0002] With the increasing demand for social and economic development and the advancement and improvement of the mining engineering technology system, resource mining is constantly developing to the deep, and the damage to rocks caused by deep high stress is becoming more and more serious. Parameter information is particularly important. In reality, it is difficult to obtain in-situ real-time mechanical and acoustic information under disturbed stress conditions. It is necessary to obtain rock damage mechanics and acoustic information under approximate in-situ stress fields with the help of indoor testing and sealing devices, so as to realize the analysis of resource mining and underground under high-stress conditions. The project conduct...

AI Technical Summary

Problems solved by technology

[0003] In routine indoor tests, it is often necessary to obtain rock mechanical and acoustic parameter information, but in indoor triaxial compression tests, this information is not easy to collect in real time, especially during the loading process of the press, it is difficult to integrally record rock properties in real time. Triaxial compressive strength, confining pressure, axial strain, radial strain, acoustic wave velocity, acoustic emission (AE) damage information, etc.

In the past, the uniaxial compressive strength, axial strain, and radial strain of the rock were obtained by loading the rock with an ordinary rock rigidity servo testing machine, installing an LVDT displacement sensor on the rock surface or pasting a resistance strain gauge; In the past, the acoustic wave velocity information of rocks was obtained through ultrasonic testing of unloaded rocks to obtain rock longitudinal and shear wave acoustic information, while real-time ultrasonic testing of loaded rocks was less studied; Emission (AE) damage information is obtained by installing one or several acoustic emission probes on the pad base of the testing machine or the rock surface, and it is difficult to obtain the acoustic emission positioning information of the rock

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