分层开采工艺对地表沉降的影响研究

Effect of Layering Mining on Ground Settlement

分层开采是厚煤开采的经典工艺,这种工艺对地表沉降的影响比较复杂。通过测试原岩物理力学参数,利用有限元软件flac3D对分层和一次采全高时地表沉降进行了数值模拟。结果表明,如果采高较小,砌体梁距煤层较近,且采完上分层后长时间停采,给顶板再生留足时间,分层开采较一次采全高对地表沉降影响要小。

Layering mining is a topical process which has complicated effect on ground settlement. Based on testing of the initial rock mechanical parameters,the finite element analysis software flac3 D is applied to conduct simulation on ground settlement when in layering mining and mining overall height. It is shown that,if mining height is relatively small,distance of voussoir beams is small and enough time is given to roof regenerated for stopping coal mining is long after completely mining upper layered,the effect of layering mining on ground settlement is less than that of a mining overall height.