›› 2017, Vol. 38 ›› Issue (10): 2799-2808.doi: 10.16285/j.rsm.2017.10.004

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Numerical implementation of a state-dependent constitutive model for unsaturated clays

LI Jian1, 2, WEI Chang-fu1, LIU Yan2   

  1. 1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2016-06-15 Online:2017-10-10 Published:2018-06-05
  • Supported by:

    This work was supported by the Fundamental Research Funds for the Central Universities (2016RC043), the National Natural Science Foundation of China (NSFC) (51608033) and the China Postdoctoral Science Foundation (2015M582314).

Abstract: A state-dependent constitutive model for unsaturated clays is proposed based on the double plastic mechanisms (i.e., shear sliding and loading collapse mechanisms), and the coupling between hydraulic hysteresis and stress-strain behavior. In the proposed model, the stress integration at the intersection of two solid phase yield surfaces is addressed using an implicit integration algorithm. The consistent tangent matrix of constitutive model is explicitly derived by considering the relationship between stress and suction. Finally, the numerical simulations of triaxial tests on unsaturated clay are carried out to demonstrate the abilities of the constitutive model. The calculated results of strain-controlled tests on unsaturated soils with different step sizes are compared to demonstrate the convergence and accuracy of the implicit algorithm. The two-dimensional ground consolidation of unsaturated soils is analyzed using the U_DYSAC2 program to demonstrate the validity of the consistent tangent matrix.

Key words: unsaturated clays, state-dependent, constitutive model, implicit integration algorithm, consistent tangent matrix

CLC Number: 

  • TU 442

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