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考虑可靠性分析中结构极限状态变量在零值附近的模糊区间,建立边坡稳定性模糊随机可靠度分析模型。研究了在土性参数变异性、模糊失效概率隶属度函数梯形与岭形分布类型情况下,模糊区间宽率与偏度对模糊可靠指标的影响。分析结果显示:偏度与可靠性指标曲线的斜率随宽率的减小而减小,且其趋势与参数变异性与模糊失效概率隶属度函数类型无关;对于宽率的某一确定值而言,偏度的增大会导致模糊可靠指标的降低;土性参数变异性的增加会导致模糊可靠指标的降低。
Considering the structural limit state variables in the fuzzy interval around the zero value in the reliability analysis, a fuzzy random reliability analysis model of slope stability is established. The influence of fuzzy interval breadth and skewness on the fuzzy reliability index is studied under the condition of the variability of soil parameters and the type of distribution function of fuzzy failure membership function. The results show that the slopes of the skewness and reliability index curves decrease with the decrease of the breadth, and the trend and parameter variability are not related to the fuzzy failure probability membership function type. For a certain value of the width ratio , The increase of skewness will lead to the decrease of fuzzy reliability index. The increase of variability of soil parameters will lead to the decrease of fuzzy reliability index.