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.%Considering the variability of geotechnical shear strength parameters, combining with the limit equilibrium method and the reliability theory, the safety factor probability density distribution function model is constructed. An effective region is built after taking the safety factors which are greater than the critical safety factor as criterion, and then the average value of safety factors in the effective region multiplied by corresponding reliability, the effective safety factor based on the random dual index of safety factor and reliability is obtained combining practical engineering characteristics. Taking the effective safety factor as quantitative index, meanwhile, the macroscopic characteristics phenomena of slope are associated with quantitative analysis, the slope stability analysis and evaluation method are constructed more clearly. Through a practical work, the differences between the effective safety factor obtained in this paper and traditional evaluation indexes are analyzed. The conclusions can be reference for practical engineering.
展开▼
