Stability of unsaturated soil slope considering stratigraphic uncertainty and rotated anisotropy of soil properties

The stratigraphic uncertainty and rotated anisotropy of soil properties exist widely in nature. Recent studies have shown that the slope stability was significantly influenced by these two uncertainties. However, there is no proper method for simulating these two uncertainties at the same time, and...

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Bibliographic Details
Published in:International journal for numerical and analytical methods in geomechanics 2024-02, Vol.48 (2), p.359-376
Main Authors: Cao, Wei, Zhou, Annan, Shen, Shui‐Long
Format: Article
Language:English
Subjects:
Anisotropy
geological uncertainty
Groundwater
Groundwater levels
Groundwater table
Reliability
rotated anisotropy
Slope stability
Soil analysis
Soil investigations
Soil properties
Soil stability
spatial variability
Stability analysis
Stratigraphy
Uncertainty
unsaturated soil
Unsaturated soils
Water table
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Summary:The stratigraphic uncertainty and rotated anisotropy of soil properties exist widely in nature. Recent studies have shown that the slope stability was significantly influenced by these two uncertainties. However, there is no proper method for simulating these two uncertainties at the same time, and the influence of the two uncertainties has not been considered in previous unsaturated soil slope stability analysis. This paper aims to propose a coupled method for characterizing the stratigraphic uncertainty and rotated anisotropy of soil properties, and investigate the unsaturated soil slope stability considering the two uncertainties. Through a slope case, the proposed method for characterizing the two uncertainties is examined. The effect of rotational angle on the slope stability and groundwater table is studied. In addition, four different uncertainty considerations are chosen to compare their influence on the slope stability and groundwater table. The results show that the proposed method can well characterize the two uncertainties at the same time. The rotational anisotropy of soil properties has a substantial impact on the slope stability and groundwater table. The rotational angles corresponding to the maximum and minimum reliability index of slope depend on the uncertainty considerations in the slope stability analysis. The slope reliability index only considering stratigraphic uncertainty is the highest, and the slope reliability index considering stratigraphic uncertainty and rotated anisotropy of soil properties is the lowest.
ISSN:0363-9061
1096-9853
DOI:10.1002/nag.3642