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考虑岩土体抗剪强度参数的变异性,综合极限平衡法和可靠性理论构建了安全系数概率密度分布函数模型。结合实际工程特点,以安全系数大于临界值为标准构建有效区,将有效区安全系数均值与对应可靠度相乘,得到以安全系数和可靠度为随机二元指标的有效安全系数。以有效安全系数为定量指标,将边坡宏观特征现象与定量分析相联系,构建意义更为明确的边坡稳定性分析及评价方法。通过工程实例对比了有效安全系数与传统评价指标之间的差异。所得结论可为工程建设提供参考和借鉴。
Taking into account the variability of shear strength parameters of rock and soil mass, the probability density distribution function model of safety factor is constructed by the method of limit equilibrium and reliability theory. According to the characteristics of the actual project, the effective area is constructed based on the safety factor greater than the critical value. The mean value of the safety factor of the effective area is multiplied by the corresponding reliability, and the effective safety factor with random binary index of safety factor and reliability is obtained. Taking the effective safety factor as the quantitative index, the macroscopic phenomenon of slope is linked with the quantitative analysis to establish the more definite slope stability analysis and evaluation method. The difference between the effective safety factor and the traditional evaluation index is contrasted by engineering example. The conclusions can provide reference for engineering construction.