覆岩结构对冲击矿压的影响及其微震监测

Effect of Overlying Strata Structures on Rock Burst and Micro-Seismic Monitoring Analysis

为了研究覆岩结构对冲击矿压的影响,以关键层理论为基础对某煤矿上覆岩层结构进行了划分,并利用微震监测技术对巨厚上覆岩层破断规律进行了分析.研究结果认为对上覆岩层可根据岩性、厚度不同划分成不同级别的关键层结构,这些结构初次破断形成的"O-X"型破断结构有主亚之分.大尺度的覆岩结构在破断过程中释放巨大能量形成矿震,是冲击矿压的重要诱发因素.该煤矿微震监测数据很好地解释了亚关键层的初次破断及200 m厚细粉砂岩主关键层的破断发展过程.研究成果为大尺度覆岩结构影响下的冲击矿压的预测预报提供了新的研究思路.

Based on the key stratum theory,overlying strata structures in one coal mine are divided,and micro-seismic monitoring is used to analyze its rupture regularity.The results show that the overlying strata are divided into key strata of different grades according to lithology and thickness.The initially formed ＂O-X＂ fracture structures have the main ＂O-X＂one and the sub-level ＂O-X＂one.Large amount of energy is released and mine earthquake takes place during the breaking of large scale overlying strata structures,forminge main inducing factor of rock burst.The initial rupture process of inferior key stratums and 200-m-thick main key stratum in the coal mine is well explained by micro-seismic events,and the achievements provide a new way of predicting rock burst caused by large scale overlying strata structures.