Research on model for permeability of coal under stress and temperature coupling condition

doi:10.16265/j.cnki.issn1003-3033.2017.06.024

Abstract

Abstract: In order to study the variation trend in seepage of coal with increasing depth of mining,seepage experiments were carried out by using a piece of triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing methane.A permeability model considering slippage effect under the stress and temperature coupling condition was built. The model was verified by experimental data.That there is a negative correlation between the volumetric strain and the radial strain, and the axial strain show the opposite trend of decreasing and increasing with the increase of temperature,that the permeability first decreases and then tends to be gentle with the increase of pore pressure, and it shows an increasing trend with the increase of temperature. The permeability calculated by the permeability model of coal under the coupling condition between stress and thermal conforms with the experimental results,and that under the low porosity pressure, the slippage effect is more obvious, and it is weakened with the increase of pore pressure.

Key words: coal, pore pressure, slippage effect, permeability, stress and temperature coupling

CLC Number:

X936

LI Bobo, YANG Kang, XU Peng, XU Jiang, ZHANG Min. Research on model for permeability of coal under stress and temperature coupling condition[J]. China Safety Science Journal, 2017, 27(6): 139-144.

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