Slopes with fabric anisotropy widely exist in nature due to complex geological depositions and the inherent spatial variability of geomaterials. The soil with fabric anisotropy is herein characterized by a random field, and the factor of safety (FS) of an anisotropic soil slope is calculated by the finite element method. By virtue of Monte Carlo simulations, the statistical characteristics of FS of an undrained clay slope are estimated. The analysis results suggest that the soil fabric anisotropy has a significant effect on the landslide susceptibility. When the anisotropy with rotated angles inclines around 45° or 135°, the probability of slope failure is higher than that at other rotated angles, and the variability of FS reaches its upper limit when the anisotropy inclines parallel to the slope angle. Compared to a slope in uniform soils, an anisotropic soil slope generally has a lower FS, implying potential risks induced by the uniform soil assumption. The possibility of landslide occurrences becomes greater for a longer anisotropic length (i.e., a stronger correlation between neighboring soil properties in a dirction). The results shed lights on the role of appropriately characterizing the geotechnical anisotropy in probabilistic slope stability analyses, which can be further used for a regional landslide susceptibility assessment.

由于复杂的地质沉积和岩土材料固有的空间变异性，具有织物各向异性的斜坡在自然界中广泛存在。具有织物各向异性的土壤在本文中以随机场为特征，各向异性土壤边坡的安全系数（FS）通过有限元方法计算。借助蒙特卡罗模拟，估计了不排水粘土边坡的 FS 的统计特征。分析结果表明，土壤结构各向异性对滑坡敏感性有显着影响。当旋转角度各向异性在45°或135°左右倾斜时，边坡破坏的概率高于其他旋转角度，当各向异性平行于斜坡角度倾斜时，FS的变异性达到上限。与均匀土壤中的斜坡相比，各向异性土壤坡度通常具有较低的 FS，这意味着由均匀土壤假设引起的潜在风险。各向异性长度越长，发生滑坡的可能性就越大（即，一个方向上相邻土壤特性之间的相关性越强）。结果阐明了在概率边坡稳定性分析中适当表征岩土各向异性的作用，可进一步用于区域滑坡敏感性评估。