Limit Analysis of Basal Heave Stability in Unsaturated Soils Based on the Unified Strength Theory

An evaluation method was presented on the basal heave stability in unsaturated soils. A basal heave failure mechanism was established wherein the admissible velocity field was constructed in the light of the Prandtl failure mode. The shear strength theory based on two independent stress state variab...

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Bibliographic Details
Published in:Geotechnical and geological engineering 2021, Vol.39 (1), p.593-602
Main Authors: Zhang, Jia-hua, Ling, Tao, Rao, Yong-qiang, Wang, Cheng-yang, Yang, Wei, Xiong, Sheng, Huang, Guang
Format: Article
Language:English
Subjects:
Analysis
Civil Engineering
Earth and Environmental Science
Earth Sciences
Exact solutions
Failure mechanisms
Failure modes
Geotechnical Engineering & Applied Earth Sciences
Heaving
Hydrogeology
Independent variables
Limit analysis
Matric suction
Parametric analysis
Safety factors
Shear strength
Soil
Soil stability
Soil strength
Soil suction
Stability analysis
Technical Note
Terrestrial Pollution
Theories
Unsaturated soils
Upper bounds
Velocity distribution
Waste Management/Waste Technology
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Summary:An evaluation method was presented on the basal heave stability in unsaturated soils. A basal heave failure mechanism was established wherein the admissible velocity field was constructed in the light of the Prandtl failure mode. The shear strength theory based on two independent stress state variables was employed for unsaturated soils. The unified strength theory was introduced to account for the influence of intermediate principal stress. Analytical solution of safety factor ( F s ) was then deduced based on the upper bound theory of limit analysis, and relevant numerical solutions were solved by means of the strength reduction method. It is found from parametric analysis that the intermediate principal stress and matric suction have a significant impact on F s . Specifically, F s is seriously underestimated if they are ignored. The theoretical framework in this work provides a new idea for analyzing the basal heave stability of unsaturated soils.
ISSN:0960-3182
1573-1529
DOI:10.1007/s10706-020-01481-5