西部黄土山区开采沉陷变形数值模拟研究

西部黄土山区开采沉陷变形规律远比平原地区复杂多变。以陕西铜川厚黄土山区采矿地质条件构建不同斜坡组合与平地条件的计算模型,通过FLAC-3D数值模拟分析了单一斜坡、凸形和凹形组合斜坡条件下地表侧向滑移引起的水平移动和下沉分布特征,并绘出了地表开采沉陷与斜坡侧向滑移分布曲线。进一步分析表明,当开采沉陷引起的水平位移及其变形与斜坡向下坡方向的滑移变形方向一致时,在地表形成两者的叠加,增大了斜坡体的变形;当两者方向相反时则导致2种变形部分"抵消"。上述采动斜坡中开采沉陷与坡体侧向滑移的"叠加"效应,导致了黄土山区地表沉陷变形规律的复杂性。

Numerical simulation of mining subsidence in the western loess mountain area

Mining subsidence deformation law in the western loess hilly area is more complex than the fiat area. Under the thick mountainous mining geological conditions of Tongchuan loess, the calculation models of the different slope and fiat combinations, horizontal displacement and sinking distribution characteristics caused by lateral surface sliding slope are analyzed through the FLAC -3D numerical simulation under the conditions of the single one slope, convex and hollow combinations, the surface subsidence and lateral sliding slope distribution curve are drew. Further analysis shows that, when the horizontal displacement and deformation caused by mining subsidence and sliding deformation direction of slope in the same direction, superposition is form in the surface formation, the deformation of the slope is increased. When the two are in opposite directions, two kinds of deformation are partially off- set. The superposed effects of the mining slope of mining subsidence and slope lateral sliding lead to the complexity of the deformation law in the surface subsidence loess mountainous area.