Open Access

ARTICLE

Influence of Ground Stress on Coal Seam Gas Pressure and Gas Content

Xuebo Zhang^{1, 2, 3}, Zhiwei Jia^{1, 2, 3, *}

1 The Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo, 45400, China.
2 State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo, 45400, China.
3 School of Safety Science & Engineering, Henan Polytechnic University, Jiaozuo, 45400, China.

* Corresponding Author: Zhiwei Jia. Email: .

Fluid Dynamics & Materials Processing 2019, 15(1), 53-61. https://doi.org/10.32604/fdmp.2019.04779

Abstract

The influence of ground stress was quantitatively analyzed on coal seam gas pressure and gas content in this paper. Mining activities in coal mine can result in stress concentration in the coal (rock) body around the mining space, but porosity of the coal seam would not change too much. Therefore, gas pressure and gas content in the coal seam are slightly affected. Studies showed that the free gas was gradually transformed into adsorbed gas, and the gas adsorption volume was small, and then gas pressure increases roughly linearly when the porosity decreased because of stress influence. Additionaly, when porosity of coal seam reduced to 40%, the amount of adsorbed gas accounted for no more than 10% of coal seam gas content, and the increase of gas pressure did not exceed 15% of the original gas pressure.

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Keywords

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