Coal rock circulation friction-gas seepage coupling test device and test method

Abstract

The invention discloses a gas-containing coal circulation friction-gas migration coupling test device and method. By combining and analyzing field actual conditions related to mining and rock mechanics and designing a clamping cushion block with a groove and a nested axial loading oil cylinder, the problem that the device is difficult to seal is emphatically solved, and coupling analysis of coal rock circulating friction and seepage problems is achieved. The device mainly comprises a gas-containing coal circulation friction system, a gas injection and pressurization system and a data real-timeacquisition system, the cyclic friction slippage behavior and the gas seepage of the coal and rock mass can be simultaneously carried out; a data real-time acquisition system is used for carrying outdata monitoring and acquisition on the cyclic friction shear slip state and the gas migration characteristics of the coal and rock mass; the test device can effectively simulate the gas-containing coal rock circulation friction slip phenomenon of a fault structure or a through fracture, and has great significance in researching the mechanism of coal and gas outburst induced by slip instability and coal safety mining and disaster prevention and control.

Description

technical field [0001] The invention relates to the fields of mining and rock mechanics, in particular to a coal-rock circulation friction-gas seepage coupling test device and test method. Background technique [0002] In the process of mining, due to the existence of structural planes such as faults or through fissures, coal and rock mass often undergo frictional slip along these structural planes under mining disturbances, especially under complex mining disturbance conditions, these structural planes Usually in a state of cyclic loading, the coal-rock mass under cyclic shear loads undergoes more complex cyclic friction-slip behavior, which significantly changes the mechanical properties of the coal-rock and affects the stability of the coal-rock structure. [0003] Gas seepage has always been an important issue in the process of scientific mining of coal resources. The characteristics of gas seepage inside coal are the basic content of studying gas dynamic disasters and g...

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Problems solved by technology

[0004] In the related research of rock mechanics, the friction phenomenon of rock structural surfaces or fissures is also called joint shear; at present, some scholars have used coal-rock mass structural surfaces to carry out cyclic joint shear tests, but due to the difficulty of sealing, it has not Considering the effect of gas (fluid) body; the existing "seepage-joint shear" test device can only perform single-path shear slip, and cannot describe the impact of coal-rock sample contact surface failure on friction slip under cyclic shear slip. The role of migration characteristics and seepage characteristics

[0005] To sum up, it is necessary to study the characteristics of coal mass friction-slip and permeability evolution under the coupling mechanism of "cyclic friction-gas seepage" of coal-rock mass, but there is still a lack of effective description of coal-rock "cyclic friction-gas seepage". "Test setup for coupling characteristics

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