Precursor Information Recognition of Rockburst in the Coal-Rock Mass of Meizoseismal Area Based on Multiplex Microseismic Information Fusion and Its Application: A Case Study of Wudong Coal Mine

Abstract In recent years, the rockburst induced by steeply inclined coal seam mining in Urumqi area has become serious. this paper, evolution law of multiplex microseismic information before and after is obtained through in-depth field data. addition, characteristics activities coal-rock mass meizoseismal are revealed from three important scales: time, space, strength. The results show following: (1) activity Wudong Coal Mine mainly stress migration type. sandwiched rock pillar primary inducement rockburst, b value decreases greatly with progresses (by 23.9%). It indicates that risk local failure increasing. (2) From time scale strength index, precursory indexes put forward, respectively: ① daily total energy frequency microseisms suddenly rise fall rapidly at same shock start-up period (5 days rockburst), to abnormal valley within 30 days. ② growth rate events exceeded 60% a certain stage, “induced events” appeared. (3) positively correlated decline cumulative apparent volume, Schmidt. determined will occur 19 entering early warning period. prediction examples method good effect on strong areas, which can provide reference for prevention process areas.