五马水库坝基深层抗滑稳定安全系数的敏感性分析

Sensitivity Analysis of Safety Factor on Deep Anti Sliding Stability of Dam Foundation of Wuma Reservoir

五马水库大坝为浆砌石重力坝,施工开挖中发现坝基面有倾向下游的双斜面粉砂质泥岩软弱夹层存在,水库蓄水后构成坝基潜在滑动面的安全隐患。为保证水库安全,找出影响坝基深层抗滑稳定安全系数最小值k的各要素之间关系,进行敏感性分析,评价大坝沿坝基软弱夹层的抗滑稳定性,提出增强坝基深层抗滑稳定性的工程措施。

Wuma reservoir dam is a masonry gravity dam.During the construction and excavation,it is found that the dam foundation surface has a double inclined flour sandy mudstone weak interlayer inclined to the downstream,which constitutes a safety hazard of the dam foundation potential sliding surface after the reservoir impoundment.In order to ensure the safety of the reservoir,this paper studies the relationship between the factors that affect the minimum value k of the safety factor of deep anti sliding stability of the dam foundation,and makes a sensitivity analysis.On this basis,the anti sliding stability of the dam along the weak interlayer of the dam foundation was evaluated,and the engineering measures to enhance the deep anti sliding stability of the dam foundation were put forward.