深井空场法开采急倾斜薄矿脉地表沉降规律研究

采用二维有限元程序, 模拟计算了不同倾角薄矿脉由浅至深开采过程中地表沉降范围和最大下沉量随倾角及开采深度的变化趋势。结果表明, 倾角越大, 开始产生地表下沉的深度也越大, 而地表下沉范围越小, 当矿体倾角足够大时, 甚至不会在地表形成下沉盆地; 随开采深度增大, 下沉范围由近空区上盘围岩呈下开口抛物线逐渐向地表发展, 当在地表形成下沉盆地后, 其地表沉降范围及最大下沉量似线性增长, 其中, 地表下沉范围扩展速度与矿体倾角无关。

Surface Subsidence Rule for Mining Steeply Inclined Thin Veins by Open Stoping Method in A Deep Well

The variation of surface subsidence scope and the maximum subsidence with the mining deepening were studied using two-dimensional finite element program by simulating stoping mining of inclined thin ore veins with different dip angle. It is found that a larger dip angle will initially result in a deeper surface subsidence within a smaller scope. And a sufficiently large dip angle even won't lead to a subsidence basin for the surface. However, with an increase in the mining depth, the subsidence scope will gradually develop from the surrounding rock of hanging wall toward the surface. When the surface subsidence basin is formed, the surface subsidence scope and the maximum subsidence will increase linearly, with the subsidence expansion rate independent with the dip angle of orebody.