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| An envelope shell model of nonlinear shearing strength for unsaturated soils |
| FANG Wei |
(School of Traffic and Transportation Engineering，Changsha University of Science and Technology，
Changsha，Hunan 410114，China)
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Abstract To reveal the variation of shear strength of unsaturated soil more intuitively and entirely，a nonlinear envelope shell model for shear resistance of unsaturated soil was put forward considering the fact that the shear resistance develops nonlinearly with the normal stress acting on the failure surface and that the friction angle varies nonlinearly with the matric suction. A method calculating the shear resistance based on the soil-water characteristic curve of unsaturated soil was suggested. The parameters in the suggested model are easily obtained without the additional tests. Moreover，comparing to Fredlund?s plane envelope model，the acquisition process of parameters is more objective，and hence，the uniqueness and accuracy of the calculation are guaranteed. The applicability and reliability of the suggested model for nonlinear shear strength of unsaturated soil were verified by comparing with some cases from literatures. Especially，this method can obtain more accurate shear strength for the unsaturated soil samples which are not easy to measure suction directly under high stress levels.
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2018, Vol. 37 
