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首先论述了土力学的理论基础仍然很不完善,仍处于半理论、半经验的发展阶段,它还缺少统一的理论基础。指出:连续孔隙介质土力学是以多相孔隙介质理论为基础描述自然界中土的行为的一门科学,它(或多相孔隙介质理论)可以作为土力学统一的理论基础。然后介绍了连续孔隙介质土力学的理论基础,讨论了多相孔隙介质理论的整体平衡方程的建立以及土力学中控制方程的选择和确定。针对非饱和土问题,利用多相孔隙介质理论(包括热力学和内变量理论),基于3种广义应力即非饱和土的有效应力(式(22))、基质吸力和气相压力作为3个独立的应力状态变量,提出并详细地论证和推导了考虑气相的能量耗散和塑性体积变形的非饱和土弹塑性本构方程。
First of all, the theoretical basis of soil mechanics is still not perfect, and it is still in the semi-theoretical and semi-empirical stage of development. It lacks a unified theoretical basis. It is pointed out that the soil mechanics of continuous porous media is a science that describes the behavior of soils in nature based on the theory of multiphase porous media. It (or multiphase porous media theory) can serve as a unified theoretical foundation of soil mechanics. Then, the theoretical basis of soil mechanics for continuous porous media is introduced. The establishment of the overall equilibrium equation of multiphase porous media and the selection and determination of control equations in soil mechanics are discussed. Based on the theory of heterogeneous porous media (including the theory of thermodynamics and internal variables), based on the three generalized stresses (ie, the effective stress of unsaturated soil (Eq. (22)), the matrix suction and gas pressure are taken as three independent Stress state variables, the elasto-plastic constitutive equations of unsaturated soil considering the energy dissipation and plastic volume deformation of the gas phase are proposed and detailedly demonstrated.