黄土山区煤层群分层开采地表位移规律分析

Analysis on Surface Displacement Law of Stratified Mining of Coal Seam Group in Loess Mountain Area

为了研究黄土山区地形对煤层群开采地表位移的影响,以榆林某矿为地质原型,利用数值软件模拟地表为近水平、正坡、负坡、凸面和凹面五种地形条件下煤层群开采。结果表明:黄土山区地形的变化,对煤层群开采顶板垂直应力影响不明显,对地表位移影响较大;单向坡开采,斜坡滑移引起的下沉量在坡顶与开采沉陷量形成“叠加”,在坡底形成“抵消”;在组合坡中,煤层群开采地表位移量相差很大,说明在变坡点附近地表位移较为复杂。

In order to study the influence of loess mountain terrain on surface displacement of coal seam group mining,a mine in yulin was taken as the geological prototype,and numerical software was used to simulate coal seam group mining under five topographic conditions:near horizontal,positive slope,negative slope,convex and concave surface.The results show that the change of topography in loess mountainous area has no obvious influence on the vertical stress of mining roof of coal seam group,but has great influence on the surface displacement.In one-way slope mining,the amount of subsidence caused by slope slip is superimposed on the top of the slope and the amount of mining subsidence,and is offset at the bottom of the slope.In the combined slope,the surface displacement of coal seam group is very different,indicating that the surface displacement near the slope change point is more complex.