Coal rock solid gas coupling fine observation mechanics loading device

Abstract

The invention discloses a solid and gas coupling mesomechanics charger of coal rocks, which has the following structure: a testing body is opened with a testing cavity, a measuring orifice and a multi-purpose air vent, a transparent sight glass is fixed at an opening position of the testing cavity, a measuring conducting wire is arranged inside the measuring orifice, an inner port of the multi-purpose air vent is positioned on an inner wall of the testing cavity, and an outer port of the multi-purpose air vent is connected with a gas pipe; a cushion block, a limit pressure head and a loading head are arranged inside the testing cavity, an upper part of the cushion block is opened with an L-shaped nick, a vertical surface of the L-shaped nick is over against the limit pressure head that is fixed at an inner end of a limit rod, and a transverse surface of the L-shaped nick is over against the loading head that is fixed at a lower end of a loading rod. The solid and gas coupling mesomechanics charger can implement not only the uniaxial mechanics test under the solid and gas coupled environment but also the plane strain mechanics test under the solid and gas coupled environment, provides reliable testing conditions for the solid and gas coupling mesomechanics test that collects image signals and acoustic emission signals that are inspected microscopically in real time, and leads the research environment of the coal and gas prominent mechanism test to be closer to real mine environment.

Description

technical field [0001] The invention relates to a mesomechanics test device for gas-containing coal rock, in particular to a coal-rock solid-gas coupling mesomechanics loading device, which is suitable for mesomechanics tests of the whole process of coal rock instability, destruction and deformation under different gas pressures. Background technique [0002] With the continuous increase of the depth and intensity of coal mining in our country, coal-rock dynamic disasters in mines have become more and more serious, which has brought a great negative impact on our national production, among which coal and gas outbursts are the most serious. The study of the mechanism of coal and gas interaction and the dynamic process of coal and gas in resource mining plays an important role in technical support for the development of the coal industry in my country and the world, and the prevention and control of coal and gas outburst disasters in mines. At present, in the study of the mech...

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Problems solved by technology

Liu Baochen et al. used a rigid loading system and a scanning electron microscope to conduct mechanical tests and static microscopic observations on the hard coal in the Datong mining area. Since the scanning electron microscope requires a high degree of vacuum in the test environment, this type of test did not involve solid-gas coupling related to coal and gas outburst. environment; Ge Xiurun et al. used the special loading equipment designed and developed by themselves and matched with the CT machine to carry out real-time dynamic CT experiments on the mesoscopic damage evolution law of the coal rock failure process under the action of triaxial and uniaxial loading, but this equipment still cannot Realize the test under gas pressure; Feng Xiating et al. invented the coupling of stress-water flow-chemical corrosion and rock fracture mesomechanics test under different confining pressures, and carried out microscopic amplification and CCD observation on the crack propagation process of the sample ( Application number: 200410061234.3), its shortcoming is that it cannot carry out the coal sample test under the action of gas pressure; Professor He Xueqiu and others have studied the microscopic observation of the deformation and failure process of gas-containing coal, and realized the microscopic observation and dynamic test However, the stress state of the coal sample specimen is single, the observation range is only a small area on one side of the specimen, and the observation of the acoustic emission parameters of the specimen damage is lacking, and the comprehensiveness and comparability of the test results are poor.

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