巨厚松散层下煤层开采地表移动规律研究

Study of Surface Movement Principle of Coal Seam Mining under Super Thick Unconsolidated Stratum

为了研究巨厚松散层下采煤对地表沉陷的影响,以赵家寨煤矿地表移动观测数据为基础,研究了巨厚松散层地质采矿条件下采煤对地表沉降特征、地表最大下沉速度、地表最大下沉速度滞后距以及地表不同阶段移动持续时间的影响,结果表明在巨厚松散层条件下开采,地表下沉系数偏大,接近于1,主要影响角正切值偏小,地表移动范围较大,拐点偏移距较小,地表最大下沉速度滞后距较小,最后得出在巨厚松散层下开采,地表显现出下沉速度加快,活跃期延长而衰退期缩短,地表残余变形减小并且稳定快等特征。

In order to study influence that mining under super thick unconsolidated stratum to surface subsidence, it taking surfacemovement observation data of Zhaojiazhai coal mine as base, the influence that mining to surface subsidence characters, the maximalsubsidence speed of surface , delay distance of the maximal subsidence speed of surface and surface movement time in different stageunder super thick unconsolidated stratum geological mining situation, the results showed that mining under super thick unconsolidatedstratum, surface subsidence index was larger, it almost equal to one, the tangent value was smaller of the main influence angle, sur-face movement scope larger, offset distance of inflection point was smaller, delay distance of the maximal surface subsidence speedwas smaller, then the following conclusions obtained, mining under super thick unconsolidated, surface subsidence speed accelerate,active period prolonged and recession period shorten, residual deformation of surface became smaller and stable quickly, and so on.