Application of preblasting to high-section top coal caving for steepthick coal sea  

作　　者：ZHAO Jian-hui LAI Xing-ping 

机构地区：[1]School of Energy Engineering, Xi＇an University of Science and Technology, Xi＇an 710054, China [2]Key Laboratory of Western Mines and Hazard Prevention, Ministry of Education of China, Xi＇an 710054, China

出　　处：《Journal of Coal Science & Engineering(China)》2011年第2期113-118,共6页煤炭学报（英文版）

基　　金：Supported by the Natural Science Foundation of China （50375026, 50375028）

摘　　要：For mining extra-steep-thick coal seam, the sublevel top coal caving is a high efficient method in practical engineering. However, major challenges associated with mining high-section top-coal-caving （HSTCC） are related to the resulting high ground stresses. Inevitability, using the high-section sublevel top coal caving for extra-steep-thick coal seam, the large scale of mined-out area appears. If the prefracture blasting and hydraulic fracture techniques are utilized, the top coal damage and cracks will develop, and the mining complexity will increase, such as seam inclination, continuity, mechanical characteristics of roof and susceptibility of top coal, etc. First, the field conditions of B1＋2 seam were investigated at the ＋588 level of the Weihuliang Underground Mine of China. Subsequently, according to caving mechanism of strata response obtained from several special models including physical simulation tests and numerical simulation models, the prefracture process including blasting and injecting water were analyzed. Then, the prefracture blasting technique was successfully applied to the caving of 52 m-sublevel seam. Finally, the effects were verified by advanced detecting instruments, and the results show these methods and measurements are feasible and valid.

关 键 词：extra-steep-thick seam high-section top-coal caving （HSTCC） prefracture blasting and verification 

分 类 号：TD823.97[矿业工程—煤矿开采] TD322.2[矿业工程—矿山开采]