Sand's Duncan-Chang model considering intermediate principal stress,shear dilatancy and disturbed influence

The original Duncan-Chang model based on the Mohr-Coulomb strength criterion and the hyperbolic volume formula cannot consider the effects of intermediate principal stress,dilatancy and disturbance sensitivity,which affects its application scope and prediction accuracy.The existing improvements for Duncan-Chang model are only for some particular aspects.Zhao's improved model considers the effects of intermediate principal stress and dilatancy but did not consider disturbance sensitivity of sands,while Xu's model is completely opposite.This paper established a new Duncan-Chang model for sands by combining advantages of Zhao's model with Xu's model,which considers the intermediate principal stress,dilatancy and disturbance sensitivity effects,and the applicability of the new model is also discussed,which could provide a reference for practical geotechnical engineering design.