Influence of Mining Method on the Redistribution of Ground Stress in Strata Overlying Coal Seams with High Dip Angle
Inappropriate methods of mining could lead to adverse concentration of stresses around roadways or working faces, thus possibly posing a potential threat to the safe operation of a colliery. The research work is devoted to investigating the redistribution of ground stresses in strata overlying steeply inclined coal seams worked by means of two different methods of mining, i.e. the straight longwall advancing and the oblique longwall advancing at Yanshitai Colliery, Chongqing Municipality, China. Where two mining methods were employed, stresses of ground supports for roadways and working faces were measured, respectively, indirectly reflecting the redistribution of ground stresses in overlying upper strata. Data indicate that the straight longwall working had a larger scope around roadways or working surfaces affected than the method of oblique longwall mining; in addition, field observations show that the oblique mining method has local falls after a longer face advance than the straight longwall working, both suggest that the oblique mining method is preferable in extracting steeply inclined coal seams dominating Southwest China coalfields, and has a more reliable control on the movement of overlying strata. Finally, the conclusion has been further supported by data obtained from laboratory tests of analog simulation.
steeply inclined coal seams mining method redistribution of ground stress analog simulation test
YIN Guangzhi ZHANG Weizhong HUANG Gun DAI Gaofei
College of Resources and Environmental Sciences,Chongqing University,Chongqing 400044 China;Key Labo College of Resources and Environmental Sciences,Chongqing University,Chongqing 400044 China Key Laboratory of Exploitation of Southwest Resources and Environmental Hazards Control Engineering,
国际会议
The 2007 International Symposium on Safety Science and Technology(2007采矿科学与安全技术国际学术会议)
河南焦作
英文
30-35
2007-04-17（万方平台首次上网日期，不代表论文的发表时间）