Anisotropic rock damage degree test device and test method thereof

Abstract

The invention relates to an anisotropic rock damage degree test device and a test method thereof, and aims to provide the anisotropic rock damage degree test device which is simple in structure, convenient to operate and lower in cost, as well as the test method of the test device, so as to directly measure the gas permeability of the damaged rock in different directions. The technical scheme of the invention is as follows: the device is used for testing a circumferential gas permeability coefficient and an axial gas permeability coefficient of a rock sample, and includes an axial pressure device and a circumferential pressure device which are used for applying pressure on the rock sample in the axial and circumferential directions respectively; an intermediate drilling hole is formed in the middle of the rock sample; the device also includes pressure plates, a closed sleeve, a pressure pump, a water storage container, a pressure gauge and a measuring tube; the closed sleeve sleeves the rock sample in a co-axial manner; the pressure plates are arranged between the axial pressure device and the upper and lower ends of the rock sample; the pressure pump is connected to the lower end of the rock sample through an air inlet pipe; the upper end of the rock sample is connected to the interior of the water storage container via an air outlet pipe and the measuring tube sequentially; the pressure gauge is connected onto the air outlet pipe. The anisotropic rock damage degree test device and the test method, provided by the invention, are applicable to the field of underground engineering.

Description

technical field [0001] The invention relates to an anisotropic rock damage degree testing device and a testing method thereof. Applicable to the field of underground engineering. Background technique [0002] After the excavation of underground engineering, the surrounding rock will be damaged due to the secondary adjustment of stress, especially now that the number of deep underground rock engineering is increasing, the burial depth is increasing, and the contradiction between ground stress and rock mass strength is becoming more and more acute, resulting in The degree of damage to the surrounding rock is also increasing, and the existence of damage will directly affect the mechanical properties of the rock itself, and then affect the overall stability of the underground engineering. [0003] Stress damage in rocks is irreversible and will lead to permanent changes in the internal structure of rocks. These changes will lead to changes in the physical and mechanical propert...

AI Technical Summary

Problems solved by technology

These test methods have been popularized and applied in engineering practice, but because rocks generally have anisotropic characteristics, the above measurements can only reflect an overall damage degree, especially because stress damage will aggravate the anisotropic characteristics of rocks, resulting in Most of the test results stay at a qualitative point of view, and it is impossible to accurately judge the exact damage degree caused by the damage to the rock

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