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临界状态的概念是临界状态土力学中最重要的概念之一,它是临界状态土力学的基石。但到目前为止,非饱和土临界状态的明确的定义以及到达临界状态的必要条件还没有清晰地给出。基于热力学的理论,推导给出了非饱和土变形过程到达最终点即稳态的约束条件。指出非饱和土变形过程到达最后的结束状态就是稳定平衡状态(简称稳态),而这种稳态针对非饱和土而言,就是其临界状态;非饱和土的临界状态是具有普适性的热力学过程的稳态的特殊情况。与基于实验给出的非饱和土临界状态的条件相比,给出的非饱和土临界状态的约束条件是更具完备性和一般性,并且是基于严格的热力学的理论推导得到的,而不是根据某一特殊非饱和土样本的实验结果给出的结论。
The concept of the critical state is one of the most important concepts in the soil mechanics of the critical state. It is the cornerstone of soil mechanics in the critical state. However, so far, the clear definition of the critical state of unsaturated soils and the necessary conditions for reaching the critical state have not yet been clearly stated. Based on the theory of thermodynamics, the constraints of the steady state of the deformation process of unsaturated soils reaching the final point are given. It is pointed out that the final state of unsaturated soil deformation reaches its final equilibrium state (referred to as steady state), which is the critical state for unsaturated soil. The critical state of unsaturated soil is universal The steady-state special case of thermodynamic processes. Compared with the condition of the critical state of unsaturated soils based on experiments, the critical conditions of unsaturated soils given are more complete and generalized, and are derived based on strict theoretical thermodynamics rather than Based on the experimental results of a particular unsaturated soil sample, the conclusion is given.