相邻工作面采掘期间遗留煤柱稳定性分析及防冲措施OA

To solve the problem of rockburst risks during the excavation and mining of adjacent working faces of large-bur-ied-depth remaining coal pillars at the same horizontal level,this paper takes the remaining coal pillar of the 7305 working face in Zhaolou Coal Mine as the research object.Through theoretical analysis of the influence of mining depth and overlying coal seams on the stability of the remaining coal pillar,a numerical model is established using FLAC3D to simulate the stress evolution process of the remaining coal pillar during the excavation and mining of the working face.The research results show that the overall stress of the remaining coal pillar at the same horizontal level changes little during the tunneling peri-od,but the overall stress concentration is relatively obvious during the mining period,and the maximum influential range on the coal pillar is 60 meters.A series of targeted pressure relief measures are proposed,and micro-seismic monitoring and ob-servation are carried out.This effectively avoids the occurrence of rockbursts in the area of the remaining coal pillar,ensu-ring the efficient and safe operation of the working face.