关键词: Klinbenberg效应, 赵阳升公式, 瓦斯抽放

Abstract:

Klinbenberg effect’s existence for gas flow in coal seam has been demonstrated by previous researches. It is a key issue for the numerical simulation of methane recovery to present the model of coupled gas flow and deformation process with Klinbenberg effect. The permeability’s dependence on gas pressure and confining stress in coal seams was studied through experiments. Experimental data’s fitting analysis shows that the fitting result of ZHAO YS formula is perfect, and Klinbenberg effect and the effect of confining stress on permeability can be better considered. The formula was coupled into the established seepage-stress coupled model; and the seepage-stress coupled model with Klinbenberg effect was presented. The corresponding code was developed; and the code was proved to be right with analytical solution. numerical cases with Klinbenberg effect and without Klinbenberg effect were studied. Our main findings are as follows: gas pressure drop with Klinbenberg effect is faster than that without Klinbenberg effect, which is conformable to the theoretical results; and the model with Klinbenberg effect is of marked theoretical and engineering value.

Key words: Klinbenberg effect, ZHAO YS equation, methane recovery