基于饱和-非饱和土理论的病险土坝稳定性分析

Study on Slope Stability of Dangerous Earth Dams Based on Saturated-Unsaturated Soil Theory

在病险土坝坝坡稳定分析中引入饱和-非饱和土理论,通过推导饱和-非饱和渗流统一方程和优选非饱和土的特征参数,提出了饱和-非饱和土理论的优化法来分析病险土坝的新思路,并结合工程实例对比分析仅考虑饱和土和考虑饱和-非饱和土的优化法两种理论下的病险土坝坝坡稳定的计算结果。结果表明:考虑饱和-非饱和土理论后,病险大坝加固前安全系数高出3.6%、加固后安全系数高出3.8%,同时可看出滑动弧面明显加深,说明了安全系数提高的合理性,因此考虑饱和-非饱和土理论的优化法用于病险土坝坝坡分析更为合理。

According to the lagging of slope stability analysis in earth dam reinforcement work, thetheory of saturated-unsaturated soil wascarried out in the paper. By deriving the unified equation of saturated-unsaturated seepage theory and optimizing characteristic parameters ofunsaturated soil, a new idea that an optimization method of saturated-unsaturated seepage theory was used to analyze risk earth dams had beengiven. Combined with engineering examples, slope stability results of the two theories including saturated seepage theory and saturated-unsat-urated seepage theory were analyzed. The research results show that the safety factor before and after reinforcement of the dangerous dam is3.6% and 3.8% higher respectively, considering the theoretical analysis of saturated-unsaturated soil. At the same time, it can be seen thatthe sliding surface is obviously deepened, which shows that the safety factor is improved rationality and the optimization method of saturated-unsaturated seepage theory has been proved to be more reasonable. The optimization method can provide theoretical reference for further re-search on the dam reinforcement work.