深井条带开采地表沉陷规律分析

Analysis on Ground Subsidence Law of Strip Mining in Deep Mine

为掌握煤炭深部开采带来的地表沉陷规律,根据矿区实情并参考以往设站参数建立区域观测站。通过4年多连续不间断的监测,拟合出该矿区地表下沉曲线及水平移动曲线,求出概率积分法所需各种移动变形参数。分析结果表明:深部开采时的基岩厚度增大,影响地表移动变形的因素多,地表沉陷在倾向上最大影响范围超过700 m,相应的盆地边缘移动变形值小。条带开采地表下沉比较平缓,没形成大的沉陷盆地,一次采全高情况下地表沉陷值相对较大,地面出现了塌陷区。采全高与条带开采的边界角相差不大,相同的开采影响范围内,条带开采下沉值较小,地表下沉盆地相对平缓。

In order to master the ground subsidence law occurred from the coal mining in the deep mine,a regional observation station was established according to the previous station parameters in the mining area.With the continued monitoring and measuring in the passed 4 years and the several fitting of the subsidence curves and the horizontal movement curves,different movement and deformation parameters required for the probability integration were calculated.The analysis results showed that during the mining in the deep mine,the thickness of the base rock increased would influence the surface movement and deformation factors increased.The max influence scope in the high inclined orientation of the surface subsidence scope would be over 700 m and the relevant movement and deformation value of the basin boundary would be smaller.The surface subsidence caused by the strip mining in underground would be gently and no large subsidence basin would be formed.The ground subsidence value caused by the full seam mining would be high and a subsidence area would be appeared at the surface ground.The boundary angle difference between the full seam mining and the strip mining would not be high.In the same mining influence scope,the subsidence value of the strip mining would be small and the surface subsidence basin would be gently.