Pressure rock failure and instability process and dynamic permeability test apparatus and method thereof

Abstract

The invention relates to a pressure rock failure and instability process and dynamic permeability test apparatus and a method thereof. A stress strain signal, a sound emission signal and an apparent resistivity signal in the pressure rock failure and instability process are acquired and processed by using a large pressure rock permeability test device to obtain the stress strain relationship, the quantity and positions of sound emission events and the rock apparent resistivity change rule induced by pressure water permeability increase in large pressure rock failure and instability process in order to obtain the dynamic evolution role of crack expansion, perforation and instability in the rock failure process under hydraulic-mechanical coupling action and the corresponding dynamic permeability. The hydraulic-mechanical coupling failure mechanism and the pressure permeability of rocks, and the deformation and strength characteristics, the crack expansion, perforation and failure characteristics and the permeability evolution rule of pressure water in the crack expansion-perforation-failure process of the rocks under the hydraulic-mechanical coupling action are researched in the invention. The apparatus and the method have important engineering values in realization of safe mining under water pressure on pressure water.

Description

technical field [0001] The invention relates to the field of pressure-bearing rock permeability tests, in particular to a test device and method for the failure and instability process and dynamic permeability characteristics of large-scale pressure-bearing rocks. Background technique [0002] Water inrush from coal seam floor is the main form of coal mine water damage in my country, especially in North China type coal fields, mine water damage caused by floor water inrush is common and prominent. At present, 60% of mines in important coal producing areas in my country are threatened by floor karst confined water to varying degrees, and the area and severity of water damage rank first among coal mining countries in the world. In recent years, with the continuous increase of mining depth, the ground stress has shown a non-linear increase trend. Deep mining is in a complex environment of "three highs and one disturbance". The water pressure and ground pressure on the floor of ...

AI Technical Summary

Problems solved by technology

However, due to the limitation of experimental equipment and test rock sample size, the research on reflecting the internal correlation between rock deformation and failure process and permeability evolution is still in its infancy, and there is a lack of systematic theoretical and experimental research results.

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