一个基于热力学的土体本构模型

修正剑桥模型假设体积塑性功的一半转化为耗散能，一半转化为由塑性变形约束的自由能，但通常体积耗散能和塑性体积自由能并不相等。基于热力学理论，通过引进间隔应力比来表征体积塑性功和塑性体积自由能的比例关系，构建了一个土的体积硬化模型。由于岩土材料耗散函数与所处的应力状态有关，因此，需要应用非关联流动法则，修正剑桥模型是适合应用相关联流动法则的一个特例，也是所提出模型的一个特例。

A constitutive model for soils based on thermomechanics

Modified Cam-clay model assumes that volumetric plastic work being dissipated is equal to which is stored. But it is more common that the division between dissipated and stored work is not equal. A reference state parameter is suggested to describe the ratio of volumetric plastic work to plastic free energy. A new volumetic harding model is proposed based on generalized thermo mechanics, Since the dissipation potential functions of geomaterials depend on the current stress, non-associated flow rule must be used. Modified Cam-clay model is a special case which obeys associated flow rule; and a special case of the model presented in this paper.