【摘要】 由现场试验结合Fredlund和Xing方法确定了堆积体的非饱和渗透性函数分布曲线。根据概化的地质模型,建立了非饱和渗流分析的有限元模型,模拟得到蓄水过程中不同时刻坡体中孔隙水压力的分布。把暂态孔隙水压力的分布和非饱和土强度理论应用到普遍极限平衡法(GLE)中,进行了库水上升过程中边坡瞬态稳定性分析。结果表明,库水上升过程中,坡体整体稳定性是下降的,而在受库水变动影响的局部区域,其稳定性系数随着库水位的上升表现出先减小后增大的趋势,即存在一个危险水位,在一定条件下,可能会诱发坡体下部局部区域失稳。更多还原

【Abstract】 Unsaturated hydraulic conductivity functions of deposits body are obtained based on Fredlund and Xing methods as well as field tests.According to the generalized geological model,the finite element model of unsaturated seepage analysis is built.Distribution characteristics of pore-water pressure in the slope at different times in the process of reservoir impounding are obtained by numerical simulation.Distribution of transient pore-water pressure and the strength theory of unsaturated soil are applied to the analysis of general limit equilibrium to study the transient stability of the slope while the water level is rising.The results show that the whole stability of the slope is descending with the water level rising.And its local stability coefficient is descended firstly and then ascended with the reservoir water level rising.Owing to the existence of a risk water-level,the lower part of slope body tends to be unstable under certain condition.更多还原