摘要通过对黄土在加载和增湿作用下能量的耗散和转换过程，以及黄土结构在加载和增湿作用下的破损规律分析，提出了黄土的增湿损伤变量的定义，并给出用与含水量或饱和度有关的增湿损伤的等效能量指标来描述增湿损伤的演化过程。参照J. C. Simo提出能量指标概念，提出黄土的加载损伤的能量指标，并通过黄土加载过程中的结构破坏过程、力学和强度指标的劣化分析，提出黄土的加载损伤演化方程。对黄土的常规三轴试验和压缩试验分析，提出符合相关联流动法则的以塑性功为硬化参数的椭圆形塑性加载函数。通过提出的塑性加载函数、加载损伤演化方程和增湿损伤演化方程，根据损伤力学和塑性力学理论推导出黄土弹塑性损伤本构关系，建立黄土的弹塑性损伤本构模型。
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.
