E3S Web Conf.
Volume 195, 20204th European Conference on Unsaturated Soils (E-UNSAT 2020)
|Number of page(s)||5|
|Section||Teoretical and Numerical Models|
|Published online||16 October 2020|
Bounding surface constitutive model for unsaturated soils considering microscopic pore structure and bonding effect
1 Beijing Jiaotong University, Key Laboratory of Urban Underground Engineering of Ministry of Education, 100044 Beijing, China
2 Beijing Jiaotong University, School of Civil Engineering and Architecture, 100044 Beijing, China
3 Henan Provincial Department of Transportation, 450018 Zhengzhou, China
This article presents a bounding surface model for unsaturated soils by using skeleton stress and bonding variable based on microcosmic pore structure as constitutive variables. A Hydraulic hysteresis soil-water characteristic curve model considering deformation and hydraulic hysteresis is combined to achieve hydraulic coupling. The proposed model can capture the change of the inter-particles bonding effect in the deformation process of unsaturated soils and accurately predict the hydraulic mechanical behavior of unsaturated soils under complicated loading paths and wetting-drying cycles. The validity of the proposed model is confirmed by the results of unsaturated isotropic compression tests, wetting-drying cycles tests and unsaturated triaxial shear tests reported in the literature.
© The Authors, published by EDP Sciences 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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