Stability of Unsaturated Soil Slope Considering Stratigraphic Uncertainty

Cao, Wei; Wan, Zheng; Li, Wenjing

doi:10.3390/su151310717

Cited by 4 publications

(4 citation statements)

References 55 publications

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“…The relative locations of boreholes and the distribution of soil types in the boreholes are shown in Figure 5. 54 The geological profile exhibits obvious stratigraphic uncertainty and contains three types of soil, i.e., clay, sand and silt. To simulate the stratigraphic uncertainty, the cell size of 0.9 × 0.3 m 2 is adopted to partition the geological profile.…”

Section: Basic Information Of Site and Slopementioning

confidence: 99%

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

Cao,

Zhou,

Shen

2023

Num Anal Meth Geomechanics

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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.

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Section: Basic Information Of Site and Slopementioning

confidence: 99%

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

Cao,

Zhou,

Shen

2023

Num Anal Meth Geomechanics

Self Cite

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“…In particular, the hydraulic fitting parameter is higher for sandy soils and lower for finer soils. Subsequently, Costa and Cavalcante [27] developed a constitutive model for obtaining the SWRC and k-function of bimodal soils, represented by Equations ( 5) and (6), respectively:…”

Section: Unsaturated Flow In Porous Mediummentioning

confidence: 99%

“…Various authors have developed or applied specific numerical solutions under adjusted conditions and simplifications for each case of stability study, highlighting the need for closed mathematical solutions for understanding the unsaturated flow that would facilitate the computational implementation, the validation of numerical models, and a better representation of the physical phenomenon [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic Approach to Transient Unsaturated Slope Stability Associated with Precipitation Event

Costa,

Dantas,

Cavalcante

et al. 2023

Sustainability

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The massif rupture is not always reached under saturated conditions; therefore, the analysis of the unsaturated phenomenon is necessary in some cases. This study performed a probabilistic approach for unsaturated and transient conditions to understand the contribution of physical and hydraulic parameters involved in slope stability. The proposed slope stability model was based on the infinite slope method and a new unsaturated constitutive shear strength model proposed in 2021 by Cavalcante and Mascarenhas. The first-order second-moment method, which incorporated multiple stochastic variables, was used in the probabilistic analysis, allowing the incorporation of seven independent variables for the probability of failure analysis as well as for quantifying the contribution of the variables to the total variance of a factor of safety at any state of moisture. This implementation allows a more realistic estimative for the probability of failure, showing in a practical way the decrease and increase of the probability of failure during a rain event. The model provided promising results highlighting the need to migrate from deterministic analyses to more robust probabilistic analyses, considering the most significant number of stochastic variables. The proposed model helps to understand the influence of moisture content on slope stability, being a possible tool in natural disaster risk management.

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“…Numerous scholars have delved into the influence of matric suction on shear strength within the domain of geotechnical engineering, particularly concerning the unsaturated constituents of soil strength [30][31][32][33]. To account for unsaturated properties in soils, Fredlund et al [34] modified the M-C criterion and proposed the concept of matric suction angle.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Three-Dimensional Tunnel Face Considering Linear and Nonlinear Strength in Unsaturated Soil

Yang,

Liao,

Zhu

2024

Applied Sciences

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The shear strength of unsaturated soils exhibits significant nonlinearity, while previous studies often simplified it with linear strength models. The objective of this paper is to investigate the distinctions in the stability of three-dimensional (3D) tunnel faces when using linear and nonlinear strength models. A new 3D rotational failure mechanism and an extended form of the Mohr–Coulomb (M-C) failure criterion were integrated into the kinematically limited analysis (KLA) framework to describe the failure characteristics of tunnel faces. Subsequently, the factor of safety (FS) of the 3D tunnel faces was calculated using the strength reduction method (SRM). In the discussion section, the impacts of nonlinear shear strength, matric suction in the unsaturated soils, and the 3D geometric parameters of the tunnel on the stability of the tunnel face were analyzed. The outcomes indicate that, in unsaturated soil conditions, diverse nonlinear strength calculation models and soil types exert disparate influences on the FS of 3D tunnel faces. The main novelty of this study lies in establishing an effective method for assessing the stability of tunnel faces in unsaturated soils.

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Stability of Unsaturated Soil Slope Considering Stratigraphic Uncertainty

Cited by 4 publications

References 55 publications

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

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

Probabilistic Approach to Transient Unsaturated Slope Stability Associated with Precipitation Event

Stability Analysis of Three-Dimensional Tunnel Face Considering Linear and Nonlinear Strength in Unsaturated Soil

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