土体耗散势的存在性

Condition of Existence of the Dissipation Potential for Geo-materials

从热力学出发,基于不可逆热力学土体损伤理论所存在的基本问题:耗散势函数可否分解为塑性势函数和损伤势函数,即塑性、损伤两种耗散机制可否解耦,给出了全量型耗散势函数存在的充分必要条件并加以严格证明。结合土体的基本变形性质,证明了土体不存在耗散势函数。

In the domain of thermodynamics,based on the fundamental constitutive issues in the theory of geo-materials damage-elasto-plasticity of irreversible thermodynamics,which is the problem if the dissipation potential function and damage potential function,the sufficient and necessary conditions for existence of dissipation potential function are given,and are proved strictly in mathematical theory.Combining with the basic deformation feature of geo-materials from dynamic triaxle test,it is proved that the dissipative potential function is not existent in geo-materials.