A disturbed state concept model of granular material considering physical state

On the basis of the theory of the concept of disturbed state of the granular materials proposed by C.S. Desai for sandy soil, through defining the relatively complete state and the completely adjusted state, we established the disturbance function, the constitutive model for the disturbed state of granular materials, and the methods for determining the parameters. The calculation results obtained from the numerical simulation towards the triaxial test results of two different kinds of granular materials in a real engineering work are consistent with the test results, which shows that this model can satisfactorily reflect the main mechanical properties of the granular materials, including the non-linear characteristics like strength and confining pressures, and the volume change characteristics that these materials show relatively obvious dilations under low confining pressure and relatively obvious contraction under high confining pressure.