Test device and method for coal body deformation under action of true triaxial stress, seepage, adsorption and desorption

Abstract

The invention provides a test device and method for coal body deformation under the action of true triaxial stress, seepage, adsorption and desorption.The test device comprises a coal sample clamp, a true triaxial stress loading part, a pore pressure loading part, a flow measuring part and a coal sample deformation measuring part.The coal sample clamp is used for clamping and fixing a coal sample.A hydraulic pump of the true triaxial stress loading part applies axial pressure, lateral pressure and circumferential pressure to the coal sample.The pore pressure loading part loads pore pressure to the coal sample through a high-pressure gas cylinder.The flow measuring part comprises a water tank and a measuring cylinder, and a draining gas collection method is adopted for measuring gas flow.The coal sample deformation measuring part comprises a strain gage pasted to the coal sample and connected to a data collector, the data collector is connected to a computer, and the deformation of the coal sample is measured.The test device is used for measuring the coal body deformation of the coal sample under the action of one or a combination of two or three of stress, seepage and adsorption/desorption, and reasonable parameters are provided for gas extraction in a working face coal seam.

Description

technical field [0001] The invention relates to the technical field of mine mining, in particular to a coal body deformation test device and method under the action of true triaxial stress seepage adsorption and desorption. Background technique [0002] In the process of coal mine production, mining will change the stress state of the coal body in the coal seam, resulting in deformation of the coal body. During the roadway excavation and production process of the working face, the gas in the coal seam will be formed through the pores and cracks in the coal body. The channel flows to the roadway and working face, and the process of gas flowing to the working face through the pores and cracks in the coal body is the seepage process of gas in the coal body. During the seepage process, the change of pore pressure will cause the deformation of the coal body. In addition, the free gas in the coal body continuously flows to the roadway and the working face, and the adsorbed gas is ...

AI Technical Summary

Problems solved by technology

The law of coal body deformation considering desorption, seepage, and stress combined effects is still unclear, which factors play a leading role in coal body deformation, and the law of coal body deformation under the action of stress-seepage-desorption needs to be further studied

[0003] Due to the problem of monitoring coal deformation during the seepage process and the sealing problem of monitoring coal deformation during coal sample adsorption / desorption, although the current experimental equipment can meet the stress-strain curve of coal rock, the seepage of coal under stress However, the requirements for studying coal deformation under stress-seepage and coal deformation under stress-adsorption / desorption cannot be met.

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