Stability Analysis of Unsaturated Slopes Considering Combined Influences of Strength Non-homogeneity and Non-saturation

In the present study, the stability analysis of slopes in four different categories of non-homogeneous and anisotropic soils under various steady flow conditions, i.e., infiltration, evaporation, no suction and no-flow are conducted based on the limit analysis method. The internal energy dissipation...

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Bibliographic Details
Published in:Geotechnical and geological engineering 2020-10, Vol.38 (5), p.5535-5547
Main Authors: Gu, Dan-ping, Ling, Tong-hua, Huang, Fu, Zhang, Liang
Format: Article
Language:English
Subjects:
Analysis
Anisotropic soils
Anisotropy
Civil Engineering
Cohesion
Earth and Environmental Science
Earth Sciences
Energy balance
Energy dissipation
Energy exchange
Evaporation
Flow stability
Geotechnical Engineering & Applied Earth Sciences
Homogeneity
Hydrogeology
Infiltration
Infiltration rate
Internal energy
Limit analysis
Matric suction
Optimization
Original Paper
Parametric analysis
Preliminary designs
Saturation
Slope stability
Soil stability
Soil suction
Soil types
Stability analysis
Steady flow
Terrestrial Pollution
Waste Management/Waste Technology
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Summary:In the present study, the stability analysis of slopes in four different categories of non-homogeneous and anisotropic soils under various steady flow conditions, i.e., infiltration, evaporation, no suction and no-flow are conducted based on the limit analysis method. The internal energy dissipation owing to soil cohesion considering non-homogeneity and anisotropy, as well as the rate of work done by the apparent cohesion resulting from matric suction are calculated. Thereafter, the analytical expression of the required cohesion and stability number of slope are derived in virtue of the energy balance equation. The optimized solutions are obtained using the optimization program. The results are compared with those of a previous study to verify the present work, and a parametric analysis is conducted to investigate the effects of cohesion strength non-homogeneity and anisotropy of cohesion strength, infiltration rate, slope geometry, and soil type on slope stability. It is found that cohesion non-homogeneity and anisotropy have significant influences on slope stability of slope subjected to the no-suction condition, and variation in steady flow conditions hardly change the effect of slope angle on slope stability. A set of numerical solutions to obtain preliminary designs is presented in Sect.  7 .
ISSN:0960-3182
1573-1529
DOI:10.1007/s10706-020-01383-6