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

被引：3
|
作者：
Zhang, Xuebo [1 ,2 ,3 ]
Jia, Zhiwei [1 ,2 ,3 ]
机构：
[1] Collaborat Innovat Ctr Coal Safety Prod Henan Pro, Jiaozuo 45400, Peoples R China
[2] State Key Lab Cultivat Base Gas Geol & Gas Contro, Jiaozuo 45400, Peoples R China
[3] Henan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 45400, Peoples R China
来源：
FDMP-FLUID DYNAMICS & MATERIALS PROCESSING | 2019年 / 15卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Ground stress; coal seam porosity; gas pressure; gas content; stress concentration; PERMEABILITY; LAW;
D O I：
10.32604/fdmp.2019.04779
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页码：53 / 61
页数：9
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