Abstract: The results of triaxial consolidation drained shear tests on medium-coarse sand in Shenyang region under different confining pressures show that the relative density strongly affects the strength-deformation property of medium-coarse sand.Taking the relative density as independent variables， the general disturbance function was put forward. Then the modified D-C model， which could reflect the disturbance’s influence on the strength-deformation property of medium-coarse sand， was developed by establishing the relationship between parameters K and peak strength and disturbed degree. The contrasts of the forecast results between the modified D-C model and D-C model are as follow: the forecast results of D-C model and experimental results are consistent when D_○D is close to zero; the stress value predicted by D-C model is larger than the modified model in this paper when sand is positive disturbance; the stress value predicted by D-C model is smaller than the correction model when sand is negative disturbance. It is found that the modified D-C model can describe the strength-deformation property of medium-coarse sand better than D-C model at the disturbed state.

Key words: Shenyang medium-coarse sand, triaxial consolidation drained shear tests;relative density, general disturbance function, modified D-C model