Elastoplastic Two-Surface Model for Unsaturated Cohesive Soils under Cyclic Loading
Publication: International Journal of Geomechanics
Volume 20, Issue 8
Abstract
This paper presents an elastoplastic two-surface model for the description of the stress–strain behavior of unsaturated cohesive soils under suction-controlled cyclic loading conditions. First, the model was developed within the framework of plastic incremental flow theory combining Barcelona Basic Model (BBM) with two-surface model. Second, by extending the Masing's rule to a general multiaxial case, the point at which the stress path reverses is taken as the memory center. Third, a bounding surface and a geometrically similar loading surface evolved in stress space through the plastic hardening criterion suggested by the corresponding author. The characteristics of nonlinear, cyclic plasticity, and deformation accumulation of unsaturated cohesive soils under cyclic loading can be described by the evolution of the constant-suction cross-sections of the bounding and loading surface in the stress space. Model simulations of the stress–strain response taking into consideration the effect of suction, net cell confining pressure and dynamic stress amplitude are compared with the results obtained from a number of suction-controlled laboratory monotonic and cyclic triaxial shear tests. In addition, typical predictions are described and compared with characteristic trends of the behavior of unsaturated soils. The comparisons indicate that the elastoplastic two-surface model can simulate the mechanical behavior of unsaturated soil under cyclic loading.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Grant No. 50579002).
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International Journal of Geomechanics
Volume 20 • Issue 8 • August 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Aug 9, 2019
Accepted: Feb 24, 2020
Published online: May 28, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 28, 2020
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