Abstract Based on the theory of thermodynamics and continuum damage mechanics and the energy conversion of loess in load and moistening，the definition of the loess moistening damage variable is put forward，as well as the equivalent energy index of loess moistening damage，which is related to the water content or the saturation degree to describe the moistening damage evolvement procedure. Based on the concept of J. C. Simos energy index，the energy index of loess load damage is presented. The structure breakage and degradation of mechanic and strength index are analyzed；and the evolvement procedure of loess load damage is given. To join with ellipse yield function and associated flow law and damage theory，in which hardening parameter is plastic work，the elastoplastic damage constitutive models of loess are derived.
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Received: 09 February 2009
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