孤岛工作面拓宽回采应力演化规律

Island Working Face Broadening Evolvement Rules of Mining Stress

以山东省鲍店煤矿八采区3上煤层地质条件为背景,运用FLAC^(3D)数值模拟软件,模拟了该矿83上03综放孤岛工作面初期回采及后期拓宽回采期间的支承应力演化情况。研究表明:孤岛工作面采前,由于相邻两侧采空区侧向支承应力影响引发"孤岛效应";孤岛工作面拓宽回采期间,应力峰值最大达到为19.07 MPa,应力集中系数为2.54;由于孤岛工作面与相邻煤矿之间的煤柱承受着上覆岩层的重量,相邻煤矿采空区的侧向支承压力对于工作面回采影响不大,为孤岛工作面避免盲目开采提供了理论依据。

Based on the geological conditions of coal seam 3 in No.8 mining area of Baodian Coal Mine in Shandong Province,FLAC 3D numerical simulation software was used to simulate the evolution of abutment pressure during the early and late mining of the fully mechanized isolated working face named 83 up 03.The research shows that the“island effect”is caused by the lateral abutment pressure of the adjacent gobs before mining.When the working face of island is widened,the peak pressure reaches 19.07 MPa and the stress concentration factor is 2.54.Coal pillars between island faces and adjacent coal mines bear the weight of the overburden.The lateral abutment pressure in the adjacent coal mined area has little effect on face mining.This provides a theoretical basis for avoiding the blind mining in island working face.