An Elastic-Viscoplastic Constitutive Model for Earth Materials

摘要

This report describes the development of a three-dimensional elastic-viscoplastic work-hardening constitutive relationship for earth materials. The constitutive relationship is capable of reproducing the hysteretic behavior of the material under both hydrostatic and deviatoric states of stress; it also accounts for shear-induced volume change and the effect of superimposed hydrostatic stress on shearing response. The capability of the constitutive relationship for simulating the time-dependent response of earth materials is examined; an example fit for a clayey sand is given based on static laboratory triaxial shear and static and dynamic uniaxial strain test results.