The early warning and evaluation of rock burst risks are important prerequisites for the safe production of rock burst mines.Taking 307 working face of Shaanxi Changwu Tingnan Coal Industry Co.,Ltd.as the research object,the technical means of microseismic monitoring and mine pressure monitoring were used to study the characteristics of microseismic activity index in different geological layers.Through fine analysis of microseismic events in different geological layers of overlying rock strata,the variation characteristics and laws of microseismic activity index in each layer of the rock strata during fully mechanized caving face passing through the square influencing zone in thick coal seam were revealed,and a differentiated evaluation method for rock burst risks for different layer based on microseismic activity index was proposed,and comprehensive early warning index for rock burst based on high-level microseismic activity was established.The feasibility of this comprehensive index for coal mine rock burst risk's early warning was proved by on-site application.
关键词
地质分层/冲击地压/冲击风险评价/微震监测/微震活动度指标
Key words
geological layers/rock burst/rock burst risk evaluation/microseismic monitoring/microseismic activity index
维普
万方数据