Accident Analysis and Prevention Measure of Dynamic Load Mine Pressure of the 31201 Fully Mechanized Working Face of Shigetai Coal Mine

摘要

In order to eliminate the potential safety hazard of concentrated coal pillar of overlying coal seam occurring in the extraction process of 31201 fully mechanized working face of Shendong Shigetai coal mine, we formulate safety measures for the next extraction by analyzing the pressure data collected by the hydraulic support in the extraction process. According to research results, there exists irregular room-mining goaf of Coal 22 above Coal 31, and the existing concentrated coal pillar and scattered coal pillar in room-mining goaf parallel to the working face may cause the fully mechanized working face to form secondary roof structure, moreover, the primary reason for large-area roof fall accident is that the concentrated coal pillar of Coal 22 is destroyed and loses stability, thus leading to the dynamic load in the extraction process of Coal 31. We analyze the data of the extraction process of Coal 31 through technical measures such as pressure observation, micro-seismic monitoring, multiple position extensometer inside stratum and surface observation, aiming at the reason for roof fall; and we formulate a set of complete prevention measures, aiming at overlying goaf and extraction pressure of this working face, so as to offer effective safety guarantee for the next extraction of this working face and also offer reference for the extraction of similar working faces.