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在非饱和土本构模型研究中,所选取的变量是否是非饱和土合适的应力变量往往被研究人员所忽视,这会阻碍本构模型的进一步发展。从土体的微观结构、能量守衡及力学平衡这3方面对非饱和土应力变量进行研究,以此提出了非饱和土应力变量选取应遵循的3个原则,强调指出非饱和土应力变量与应力状态变量的区别,并对本构模型研究中常用的应力变量进行分析,发现基质吸力、净法向应力并非为非饱和土应力变量,而有效应力和吸应力为其应力变量。建议使用有效应力来建立本构关系,其除了能满足文中提出的选取原则外,还能与饱和土理论之间有很好的过渡。文中的非饱和土应力变量选取原则还不成熟,但其重要性不容忽视,该研究还有待进一步补充和完善。
In the study of unsaturated soil constitutive model, whether the selected variables are suitable stress variables for unsaturated soil is often neglected by researchers, which will hinder the further development of the constitutive model. From three aspects of soil microstructure, energy balance and mechanical balance of unsaturated soil stress variables to study, in order to select unsaturated soil stress variables should follow three principles, emphasizing the unsaturated soil stress variables and Stress state variables, and analyzes the stress variables commonly used in the study of the constitutive model. It is found that the matrix suction and net normal stress are not stress variables of unsaturated soil, but the effective stress and suction stress are their stress variables. It is suggested that the effective stress be used to establish the constitutive relation. In addition to satisfying the selection principle proposed in the paper, it is also possible to have a good transition with saturated soil theory. The principle of selecting unsaturated soil stress variables is not yet mature, but its importance can not be ignored. This study needs to be further supplemented and improved.