Probabilistic analysis of spatial variability of saturated hydraulic conductivity on infinite slope based on the non-stationary random field
Dou Hongqiang1,2 Wang Hao1,2
1. Fuzhou University, Fuzhou 350116, China;
2. Fujian Provincial Universities Engineering Research Center of Geological Engineering, Fuzhou 350116, China
Abstract：The great natural spatial variability whose expectation value decreasing with the soil depth can be observed for saturated hydraulic conductivity. Therefore, the local average method is adopted to simulate the corresponding one-dimension non-stationary random field of spatial varied hydraulic conductivity using Fish code in FLAC. The process of rainfall infiltration is calculated using the module of two-phase flow. Within the Monte-Carlo framework, the influences of variability of saturated hydraulic conductivity on the distribution of the critical slip surface and on the corresponding failure probability at different time-moment of rainfall were studied, based on the infinite slope stability model with the effects of positive pore water pressure considered. The results show that without considering the variability of saturated hydraulic conductivity, the deterministic analysis method fails to represent the realistic slope stability. With the increase of rainfall duration, the probability of critical slip surface occurring at the bedrock of slope base may decrease; with the increase of vertical correlation distance for saturated hydraulic conductivity, the probability of critical slip surface occurring at the slope base may increase, but the corresponding failure probability of slope may decrease with the increase of vertical correlation distance.
豆红强 王浩. 非平稳随机场下饱和渗透系数空间变异性的无限长边坡稳定概率分析[J]. 土木工程学报, 2017, 50(8): 105-113.
Dou Hongqiang Wang Hao. Probabilistic analysis of spatial variability of saturated hydraulic conductivity on infinite slope based on the non-stationary random field. 土木工程学报, 2017, 50(8): 105-113.
