Simulation experimental apparatus and method for mechanical property of gas-containing coal rock under uniaxial compression

Abstract

The invention discloses a simulation experimental apparatus and method for mechanical property of gas-containing coal rock under uniaxial compression. The apparatus comprises a coal sample container,a stress loading system, a gas filling system, a gas detector, a VIC-3D non-contact full-field strain measuring system and an acoustic emission system, wherein the coal sample container comprises a coal sample container shell and a coal sample placement chamber; the top of the coal sample container shell is connected with a piston in a sealed manner; a first multi-purpose air hole is formed in oneside of the coal sample container shell, and a second multi-purpose air hole and a transparent sight glass are arranged on the other side of the coal sample container shell; and the stress loading system comprises an electronic universal testing machine and a first computer. The method comprises the following steps: 1, performing test sample preparation; 2, establishing a testing apparatus; 3, detecting air tightness of the apparatus; 4, testing in a gas-free environment; and 5, testing in a gas environment. The simulation experimental apparatus disclosed by the invention is reasonable in design, convenient to realize and full in functions, the condition that an underground setting coal pillar is positioned in uniaxial loading can be really reflected, and the simulation experimental apparatus is high in practicality and convenient to popularize and use.

Description

technical field [0001] The invention belongs to the technical field of testing the mechanical properties of coal and rock, and in particular relates to an experimental device and method for simulating the mechanical properties of gas-containing coal and rock under uniaxial compression. Background technique [0002] In recent years, with the increase of coal seam mining depth, there are more and more gas-containing coal body dynamic disasters. In order to adapt to the support requirements in high ground stress and high gas environment and to prevent and control gas disasters, mine support technology and gas disasters must be strengthened. Prevention and control technology, the number of underground coal pillars must be increased accordingly, and the remaining coal pillars are mostly under unidirectional loading (which can be considered under uniaxial compression), so the study of gas-containing gas under uniaxial compression The mechanical properties of coal samples have impo...

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Problems solved by technology

Because the uniaxial compression test of gas-containing coal rocks requires that there must be gas in the coal sample, and it is difficult to preserve the gas in the coal sample under uniaxial compression, so it is difficult to realize it.

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