Hardfill is a new material with low strength in which the granular materials are solidified with some cementing material.Based on the analysis of data from uniaxial and triaxial tests,the stress-strain characteristics were concluded that Hardfill has typical features as elastic-plastic material in its stress-strain relations.It has linear elasticity in low stress, and gradually shows the plasticity when the stress exceeds 60%~80% peak strength. Surpassing the peak strength,it goes soften obviously as the stress decreases along with the strain increase,and finally reaches the residual strength.A constitutive model for Hardfill material was put forth in which nine parameters can be determined by material triaxial test.The stress-strain curve calculated by the constitutive model fitted closely with the data from Hardfill material test,which showed that the model can display the stress strain features of Hardfill material appropriately.This constitutive model can be used for the nonlinear analysis of Hardfill dam conveniently.
