Rock damage monitoring system under the coupled action of temperature and pressure

Abstract

The invention relates to the field of rock mechanics, and discloses a rock damage monitoring system under the action of temperature-pressure coupling, including a high-temperature furnace, a fixing mechanism, a hydraulic cylinder, a pressure sensor, an acoustic emission sensor, and a linear displacement sensor; the fixing mechanism includes a high-temperature-resistant fixing Rod and high temperature resistant pressure transmission rod; the pressure sensor is connected with the piston rod to monitor the axial force on the rock, the waveguide rod is in contact with the rock, the acoustic emission sensor is connected with the waveguide rod to monitor the acoustic signal when the rock breaks, and the linear displacement sensor is fixed On the waveguide rod or frame, to measure the axial displacement when the rock is broken; the high temperature resistant pressure transmission rod is sleeved on the waveguide rod, and the hydraulic loading system is connected with the hydraulic cylinder to control the work of the hydraulic cylinder. The monitoring system can measure the mechanical characteristic parameters of the rock under the coupling of temperature and pressure and the elastic wave signal generated during the rock fracture process, so as to evaluate the internal damage of the rock under the coupling of temperature and pressure.

Description

technical field [0001] The invention relates to the field of rock mechanics, in particular to a rock damage monitoring system under the action of temperature-pressure coupling. Background technique [0002] The mining of deep mineral resources, the development of rock mass geothermal resources, and the storage of high-level radioactive nuclear waste are all subject to a certain degree of high temperature, and temperature is an important factor affecting the properties of rock strength, deformation, and destruction. However, in engineering practice, there is no rock mass that is thermally fractured only by high temperature, and it is often destroyed by multiple factors. Excavation and rock engineering stability analysis play a vital role. [0003] The physical and mechanical properties of rocks will change under high temperature environment, the strength of rocks will become lower, swelling and deformation will occur, local stress concentration will occur, and thus cracks wi...

AI Technical Summary

Problems solved by technology

However, in the thermal fracture research of rock temperature-pressure coupling, due to the high temperature of the rock, the acoustic emission sensor cannot be directly installed on the surface of the monitoring object, which limits the application of this technology in the field of material damage research at high temperature.

At room temperature, the axial deformation of the basic mechanical parameters of the rock can be measured by the displacement sensor, but the displacement sensor cannot be used in high temperature environments

[0004] At present, the acoustic emission experiments of rock mechanics at high temperature are mostly carried out on large-scale testing machines equipped with high-temperature furnaces (such as MTS, Instron, etc.). The acoustic emission signal generated by rock sample fracture needs to pass through the loading rod and fixture to reach the sensor, which has problems such as incomplete signal reception and distortion

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