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针对高堆石坝非线性强度指标坝坡稳定可靠度分析方法与参数敏感性等关键问题,提出了数值微分技术与FORM相结合的新方法,解决了功能函数为隐函数的可靠度计算问题,并深入研究了非线性强度指标φ0、Δφ对坝坡稳定的影响程度。多方案分析表明:该方法计算方便,精度高;φ0、Δφ的概型、均值、变异系数对β的影响均以前者更为显著。
Aiming at the key problems of stability analysis and parameter sensitivity of non-linear strength indexes of dam rockfill dam, a new method combining numerical differential technique with FORM is proposed to solve the reliability calculation of function function as implicit function. In-depth study of the nonlinear strength index φ0, Δφ impact on the stability of the dam. The multi-scheme analysis shows that the method is easy to calculate and has high precision. The influence of the generalized, mean and coefficient of variation of φ0, Δφ on β is more obvious than that of the former.