the influence to the coal floor and the overlying rock with different coal-pillar width is analyzed and compared;
通过理论和数值模拟的综合比较,得出合理的煤柱宽度。
dynamic progressive process of failure of overlying rock stratacaused by mining excavation is simulated by strata failure process analysis (sfpa2d) system.
应用巖层破断过程分析sfpa2d系统,分析了采动影响下覆巖破坏的动态发展过程。
the collapse of the overlying rock strata in the extraction of inclined orebody by caving method remains to be a problem that hasn't well solved.
用崩落法回采倾斜矿体时顶板围巖的崩落过程是目前没有很好解决的问题。
it is a key for mine safe production to ensure the stability of overlying rock strata in stope.
确保采场上覆巖层稳定是矿井安全生产的关键。
this leads to a honeycomb of cavities that eventually collapse due to the weight of the overlying rock layers, leaving the irregular mounds standing.
这一现象会导致地下形成蜂窝状的洞穴系统,并最终由于上覆巖层的重力而崩塌,留下一些不规则的巖石群。
during overlying rock strata being fractured, the surface gas drainage boreholes may be damaged due to ground movement.
在长壁工作面通过的过程中,地面垂直鉆孔可能随巖层移动而发生破坏。
research on failure laws of overlying rock and support resistance in fully-mechanized face in shallow seam of thick clay layers;
由于直接顶 (含顶煤 )厚度的成倍增加 ,综放采场顶板下沉量与支架工作阻力并不存在类双曲线关系。
but because of hard to fix test ring in bedrock, so report of domestic deep worked-out area overlying rock subsidence observation by layers have not yet been heard so far.
研究采空区剩余沉降对上覆建(构)筑物造成的危害程度,分层沉降观测是比较直观的方法,但由于基巖内测试环固定困难,在大深度采空区上覆巖层中进行分层沉降观测国内未见报道。