基于流固耦合的高陡边坡开挖稳定性研究

随着露天矿山开采深度的不断增加,边坡高度不断增高,采区内地应力场及边坡内孔隙水压力场因开采扰动而表征复杂,且它们对边坡稳定的影响起着不容忽视的重要作用,因此,准确地模拟分析真实边坡的稳定情况是一个亟待解决且复杂的问题。本文基于现场地应力及边坡内部水文情况的监测,结合实际工程地质结构,在数值模拟软件FLAC3D中建立三维有限元模型,带入物理力学参数,地应力场及水头高度等边界条件进行三维流固耦合分析。通过结合孔隙水压力,对比分析位移及塑性破坏云图可知边坡整体位移以沉降形式为主,位移值较小,且破坏主要发生在边坡的表层,边坡整体稳定性较好,但在坡脚、坡面、坡顶等处可能出现局部岩石崩落现象。

Based on the fluid-solid coupled to study the stability of deep and steep slope excavation

With the increase of exploitation depth in the open metal pits, the slopes height are increased continually. The in-situ stress in the mining area and the pore water pressure in the slope are shown as disturbed and complicated. Also, they are the non-ignorable factors for the slope stability. So it is an urgent and complex problem to simulate the real slope stability accurately. In this paper, based on the in-situ stress monitoring data, hydrologic condition surveying data, practical engineering geological structure, a 3D model was built in the FEM software FLAC3D, to accept the constitutive parameters, the in-situ stress boundary conditions and fluid-solid coupled constitutive relation. After combining the pore water pressure contours, the contrastive analysis on the displacement and the plastic damage zone contours, the whole displacement is vertical sedimentation, and its value is much smaller. The main damage occurred on the surface of slope. The whole slope stability is better, but, some partial collapses appeared at toe, surface and top of slope.