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Abstract Mechanical and deformational characteristics of sands are significantly affected by density and effective confining pressure. In order to reflect the effect of the two factors，the nonlinear elastic model with three-parameters (compression modulus K0，Young?s modulus and coefficient of volumetric deformation)，which was proposed by SHEN Zhujiang based on the initial strain method was modified. Firstly，a description mode of K0 compression curve was established，which could describe the effect of initial state effectively. Then，the variable of virtual peak deviator stress was defined based on state parameter；and a new description mode of shear curve was proposed so as to reflect the effect of density and effective confining pressure. In addition，dilatancy equation was also introduced to describe deformational characteristics of sand. Mathematical description of the modified model is simple，and only ten parameters are involved and easy to identify. Finally，the modified model was used to simulate drained and undrained triaxial tests. A good agreement between computed results and measured results show that the modified model can describe the effect of variation of state parameter on the mechanical and deformation characteristics of sands accurately，so as to verify the rationality of the model primarily.
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Received: 25 July 2012
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2013, Vol. 32 
