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从热力学出发,发现了基于不可逆热力学土体损伤理论所存在的两大基本问题:①岩土材料是否存在耗散势函数;②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。分别给出了全量型和增量型两种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。进一步考察耗散势函数的解耦性,给出了全量型和增量型这两种耗散势函数塑性耗散与损伤耗散可解耦的充分必要条件并进行了严格论证,结合土体的基本变形性质,证明了土体塑性耗散和损伤耗散机制不可解耦。从而证明了塑性耗散势与损伤耗散势都是不存在的。
Based on the thermodynamics, two basic problems based on the irreversible thermodynamic theory of soil damage are found out: (1) Whether there exists dissipation potential function in geomaterials; (2) Whether dissipation potential function can be decomposed into plastic potential function and damage potential function, namely plasticity , Damage the two dissipation mechanism decoupling. The necessary and sufficient conditions for the existence of two kinds of dissipation potentials, both full and incremental, are given and strictly proved. Combined with the basic deformation properties of soil, it is proved that there is no dissipation potential function in soil. Furthermore, the decoupling of the dissipative potential function is further investigated. The sufficient and necessary conditions for the decoupling of plastic dissipation and damage dissipation of both the dissipative potential function and the full-potential type are given and rigorously demonstrated. The results show that the mechanism of soil plastic dissipation and damage dissipation can not be decoupled. It proves that plastic dissipation potential and damage dissipation potential do not exist.