Numerical Simulation on the Influence of a Fault on the Ground Gas Drainage Boreholes
Based on the practical complexion of Xieqiao coal mine in Huainan, numerical simulation is conducted using the FEM software ANSYS for the contour of the stress field and the displacement field in the strata on the stope with the fault structure, the reasons why the shorter life of 2# borehole and the abnormal quantity of the gas extracted from it were analyzed. The research indicates that: (1) when the working face is far away from the fault, the influence of the fault on the overlying strata is little. As the working face advances, the distribution of strain field of strata around the fault finally connects with the strain area of the coal and rock floor, forming a fracture-connected-zone. The gas adsorbed in the coal and rock will flow into the fault along this dominant passage, and causes the quantity of gas extracted from the borehole reduce remarkably. (2)The value of the maximum principal stress in the stope with a fault is bigger than that in the stope without a fault It means that there is stress concentration near the borehole, and causes breaks appear in the borehole, so that the service life and the gas drainage effect of the borehole is influenced. The result of the simulation is inosculated to the actual condition.
fault numerical simulation gas drainage borehole
Yan Jingjing Cheng Guoqiang Liang Yunpei
Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technolog Chongqing branch, China Coal Research Institute, Chongqing 400037, China
国际会议
The 3rd International Symposium on Modern Mining & Safety Technology Proceedings(第三届现代采矿与安全技术国际学术会议)
辽宁阜新
英文
321-325
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）