煤层重复采动关键层失稳与地表移动规律研究

Study on destabilization of key seam and surface movement law under repeated mining

基于滕南地区两个煤矿的岩移数据、导水裂缝带高度观测数据和工作面钻孔资料,分析两煤矿3上、3下工作面重复采动下地表移动规律与关键层的关系,对比研究重复开采时关键层有无失稳两种情况下地表的移动规律,并通过导水裂缝带高度观测进行验证,总结了近距离煤层重复开采关键层的变化对地表移动规律的影响。结果表明:重复开采不破坏关键层时,地表移动不会产生明显变化;对关键层造成破坏时,地表移动会加剧。

Based on the rock movement data of two coal mines in Tengnan region,height observation data of water flowing fractured zone and borehole data of the working face,the paper analyzes the relationship between the surface movement law and the key seam situation of upper No.3 and lower No.3 coal seams.According to the analysis of key seam and the comparative study on the law of surface movement with and without the key seam destabilization under repeated mining,and the overburden rock damage through water flowing fractured zone height observation in different conditions,the paper concludes the surface movement law under repeated mining of key seam.The results show that,surface movement doesn＇t change significant under repeated mining without key seam destabilization,otherwise,the surface movement will get intensified.