水位骤降时某冰水堆积体边坡稳定性分析

冰水堆积体在物理力学性质等诸多方面与一般松散堆积体差别显著，研究库水位骤降对冰水堆积体边坡稳定性的影响意义重大。采用有限元数值法耦合分析某冰水堆积体边坡在水位骤降时的渗流场、位移场，并结合极限平衡法研究该边坡稳定性。结果表明，地下水浸润线明显滞后于库水位；水位下降8 d时冰水堆积体边坡在前缘基覆界面至坡面范围产生最大位移，约0.07 m；稳定性系数先减小后增大，整体稳定性较好，冰水堆积体前缘安全储备较低。研究成果可为冰水堆积体边坡稳定性分析提供参考。

Stability Analysis of Outwash Deposit Slope during Rapid Drawdown of Reservoir Water Level

The outwash deposits are different to some ordinary incompact deposits in physical and mechanical characteristics. So, it is very significant to research the influence of rapid drawdown of reservoir water level on the stability of outwash deposit slope. In this paper, combined finite element method with limited equilibrium method is used to analyze the seepage field, displacement field and stability of the deposit slope under condition of water level rapid drawdown. The results show that the saturation line of groundwater is behind the reservoir water level obviously. When the 8th day after the rapid drawdown, it causes maximum displacement in front of deposit slope within the range between slope surface and the line which is used to distinguish the bedrock and the covering, and it is about 0.07 m. The stability coefficient decreases over time and then increases. The overall stability of slope is great, but the foreside of the deposit slope is lack of some security reserve. The research results can provide reference for stability analysis of outwash deposit slope.