Study of Top Coals Short Beam Layer Failure Mechanism of Sublevel Caving Mining Working Face in Extremely Thick Coal Seam

摘要：

Top coals failure mechanism of extremely thick coal seam is the basis of high efficient application of sublevel caving mining technology in mining extremely thick coal seam, on the basis of three-layer-theory of extremely thick top coal above support in sublevel caving mining working face, the mechanic model of the short beam layer which is vital to successful sublevel mining was built and studied. The mechanic model was used in 21121 working face Qianqiu Mine and 21131 working face Gengcun Mine, Yima Coal Mining Administration, and it was proved to be consistent with the practical top coal failure situation. Whats important, it can be drawn from the mechanic model that the maximum length of short beam structure layer Lp is ration to h, and also it can be effected by its own parameters E and s1 and vertical stress from above top coal and that high support strength and frequency will benefit sublevel coals full failure and high sublevel coals extraction ration.

关键词： layer-failure character sublevel caving mining extremely thick coal seam short beam layer

作者: NAN Hua LI Xiaojun ZHOU Ying

作者单位: School of Resources Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China

会议类型: 国际会议

会议名称: The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)

会议地点: 北京

会议语种:英文

页码: 1621-1623

在线出版日期: 2008-09-24（万方平台首次上网日期，不代表论文的发表时间）