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论述了非饱和土应力状态变量的选择问题,非饱和土功的表达式表明应当采用广义有效应力、修正吸力和气压三个应力状态变量来描述非饱和土的行为.随后对非饱和土中三相的变形机制进行了探讨,通过非饱和土中气相的体变特性的研究,指出气相的体变与其他两相的变形是相互影响的,揭示了土中气相的体变和固体-液体一样也可以分为弹塑性两部分,结合气体的基本定律可以得到气相的压力-体变关系.考虑气相对土体硬化的影响,提出了一个各向同性应力作用条件下非饱和土的本构模型,并对该模型进行了验证,说明了模型的合理性.最后给出了一些预测结果并和Wheeler等人给出的预测结果进行了对比分析.
This paper discusses the selection of stress state variables in unsaturated soils, and the expression of unsaturated soil works shows that the generalized effective stress, the modified stress and the three pressure state variables should be used to describe the behavior of unsaturated soils. The deformation mechanism of gas phase in unsaturated soils is discussed. It is pointed out that the gas-phase volume change and the other two-phase deformation interact each other, revealing that the gas phase in the soil is the same as the solid-liquid Can also be divided into two parts of elasto-plasticity, and the pressure-volume relationship of gas phase can be got by combining the basic law of gas.According to the effect of gas phase on the hardening of soil, a constitutive model of unsaturated soil under isotropic stress is proposed , And the model is validated to show the rationality of the model.Finally, some prediction results are given and compared with the prediction results given by Wheeler et al.