关键词: 煤矿长壁采场, 微震监测技术, 上覆岩层运动, 支承压力, 围岩变形

Abstract: In this paper, based on the close spacing layout method of high-density geophones and near-field location principle of microseismic network, combined with mining theory, we analyzed the relationships between overburden strata movement and strata fracture, overburden strata movement and abutment pressure distribution, microseismic events and abutment pressure distribution, et al, and conducted the field survey study. The results show that mining disturbance can cause overburden strata movement and abutment pressure adjustment, which is the root cause of surrounding rock fracturing. Through analysis of strata fracturing and microseismic event distribution, it is concluded that the high stress distribution range ahead of workface is 75 m and the lateral high stress distribution range is 35 m. Ranges of fractured strata and high stress distribution of abutment pressure are all depend on the degree of mining disturbance on stope strata. Measured results of strata deformation show that the distribution difference between the extreme zone of microseismic events and obvious scope of strata pressure is about 19 m. The test results have proved the rationality of research conclusion by considering the layered strata characteristics and hysteresis properties of deformation after strata failure under high stress. The study can provide reference to the microseismic monitoring in coal mining.

Key words: longwall face in coal mine, microseismic monitoring technology, overburden strata movement, abutment pressure, strata deformation