采空区下煤层开采覆岩破坏规律数值模拟

基于古书院矿煤层的实际地质资料,利用RFPA2D分析软件对采空区下15#煤层开采覆岩破坏进行了模拟,观察开采后15#煤层坚硬顶板的裂隙发育状况,研究采动覆岩中三带的发育高度,并对结果从采场上覆岩层移动破坏规律、15#煤层顶板位移及应力变化特征方面进行了分析。通过对15#煤层三带分布研究,编制矿井冒落带和导水裂隙带高度的等值线图,确定15#煤层的导水裂隙带最大发育高度,预测在15#煤层回采过程中,9#煤层采空区积水下渗的可能性。根据裂隙发育情况,结合顶板岩性,为15#煤建立抽放系统、治理瓦斯的论证提供依据。

Numerical Simulation of Overburden Failure Laws by Coal Seam Mining Under Goaf

Based on the actual geological data in Gushuyuan coal seam,the overburden failure of 15# coal seam under goaf is analyzed by the RFPA2D analysis software,the 15# fissures situation of hard roof after mining is observed and the development height of the three zones in mining overburden rock are researched,the results are analyzed from movement and failure laws of overlying strata,the displacement and stress variation of 15# seam roof.With the distribution laws research on the 15# coal seam,the contour maps of mine caving zone and water flowing fractured zone height are compiled,and the maximum growth height of water flowing fractured zone of 15# coal seam is determined.There is the infiltration possibility of water in 9# coal seam goaf during the mining process of 15# coal seam.According to the fissures development situation,combining with roof lithology,the paper provides the basis for establishing drainage system and controlling gas in 15# coal seam.