Nonlinear Cross-Anisotropic Model for Soils at Various Strain Levels
Publication: International Journal of Geomechanics
Volume 14, Issue 4
Abstract
Nonlinearity and anisotropy of stress-strain responses are important factors influencing the behavior of soil. To describe this complex behavior of soils, a hypoelastic constitutive model is developed based on cross-anisotropic elasticity, which involves four parameters: the bulk modulus, tangent Young’s modulus, coefficient of volume deformation, and Poisson’s ratio. To satisfactorily predict the stiffness of soils at various strain levels, especially in small strain regions, a new stress-strain fitting relationship with four parameters is proposed. For normally consolidated or weakly overconsolidated clay, the dilatancy equation of the Cam-clay model is used to determine the coefficient of volume deformation. Overall, the model is convenient to use. Ten material parameters are involved, which can be obtained from an isotropic compression test, a set of drained triaxial compression tests, and a uniaxial compression test. The computed results of the model are in good agreement with the data from the tests, in which each specimen was reconsolidated under the condition. The results verify the rationality of the model.
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Acknowledgments
The work presented in this paper is part of a research project funded by the State Key Development Program for Basic Research of China (2010BC732101), the support of which is gratefully acknowledged by the authors.
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Published In
International Journal of Geomechanics
Volume 14 • Issue 4 • August 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 12, 2012
Accepted: Jun 18, 2013
Published online: Jun 20, 2013
Published in print: Aug 1, 2014
Discussion open until: Aug 26, 2014
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