大倾角特厚煤层水平分层(深部)综放开采地表沉陷与地表水渗流研究

Study of surface subsidence and surface water seeping due to horizontal section top coal caving(deep mining) in high steep thick coal seam

针对复杂地质条件下大倾角煤层地下重复开采扰动引起的地表沉陷问题及与之伴随的地表水入渗问题,运用FLAC软件,对不同水平煤层开采进行了模拟计算,总结出大倾角煤层开采随着开采水平的深部发展,地表沉陷越来越严重,沉陷的幅度逐渐减小,采空区上方裂隙逐渐压密,地表水最终沿着采空区两侧的拉破坏区入渗的特点,并对现场不同开采水平的地表沉陷以及地表水入渗情况进行了预测。对指导现场生产和理论研究有积极意义。

The presented paper carries out simulated calculation to study the issue of surface subsidence and the issue of surface water seeping due to repeated mining intrusion in high steep thick coal seam under complicated geological conditions, using professional simulation software FLAC. It draws a conclusion that with the increase of mining depth surface subsidence increases, its subsidence extent decreases, cranny pressed gradually on the top of the empty and finally surface water seep through the area yield in tension along the both side of the empty. Also, prediction of surface subsidence and complexion of surface seeping at different horizontal levels is made, which provides a value of guidance in in-situ production and academic research .