MICROSEISM MONITORING RESEARCH ON HEIGHT OF TWO REGIONS OF OVERBURDEN STRATA IN COAL FACE
Coal face mining causes the failure of overlying strata and forms the caving and crack zones that means two regions. The reliability of the height of two regions is the key factor to determine the upper limit of safety mining. In the forming process of caving zone and fracturing zone of overburden strata of coal face, due to the releasing of strain energy, the corresponding wake seismic waves (microseismic waves) will be induced at the same time. Three dimensional monolithic observation can be realized by microseism monitoring technology. In this paper, the microseismic events are monitored which are caused by the fracturing of the overburden strata in 3up107 coal face extraction of Luxi Coal Mine. The close relation between evolution of microseism and fracturing of the overburden strata is proved by the location of the monitored microseismic events. Through the microseism monitoring analysis of two regions height in 3up107 coal face of Luxi Coal Mine , for the uppermost 10 percent of microseismic events of the overburden strata, the distances are relatively large and the energy is relatively small. Moreover, the induced cracks can not form effective water flowing connectivity. In the other hand, the position under the uppermost 10 percent microseismic events of the overburden strata is determined as the fractured zone upper limit. Accordingly, the height of two regions is determined as 38 meter, which is almost the same as 36.2m identified by the popularly accepted measuring method of two ends injection water instrument. As a result, microseism monitoring technology is proved to be available in determining the fracturing height of overburden strata of coal face. It provides one new technical method to measure the height of two regions of overburden strata of coal face.
QING-ZHAO WANG SHENG JIANG YONG-JIE YANG YANG-QIANG ZHANG DE-CHAO WANG
Luxi Mining Co., Ltd of Shandong Lineng Group Jining, 272100, PR.China Key Laboratory of Disaster Prevention and Control, Shandong University of Science and Technology Qin
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
955-960
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）