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Date of Publication:2013-01-01

Journal:水利学报

Affiliation of Author(s):建设工程学部

Issue:4

Page Number:470-477

ISSN No.:0559-9350

Abstract:The elastoplasticity constitutive model considering the state-dependent is a prevalent direction for the development of modern constitutive sand theory. The current proposed state parameters can reflect the conjunct influence of the void ratio and mean effective stress, however the effect of the shearing orientation of principal stress on the stress-strain relationship of sand is still not expressed. It has been displayed that the orientation of principal stress has a significant impact on deformation and strength of sand through a large number of hollow torsion shear tests. Based on the theory of state-dependent constitutive model, a new state parameter considering the shearing orientation of principal stress is proposed and introduced into dilatancy equation and the plastic hardening modulus expression to develop a new constitutive model for sand which can display the influence of the shearing orientation of principal stress. By comparison with the related experimental data and analyzing, the method on simulating the stress-strain relationship under the different shearing orientation of principal stress is proved to be correct and accurate.

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