Based on the constitutive framework of unsaturated soils established by the continuum porous medium soil mechanics, an elastoplastic model for unsaturated soils in triaxial stress state is formulated.

基于连续介质土力学的本构模型框架，提出了一个三轴应力状态下的非饱和土本构模型。

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It has long been recognised that the latter two parameters increase substantially whenever the state of stress is triaxial compression (confined concrete).

它一直被公认后者的两个参数大幅增加的应激状态时三轴压缩(约束混凝土)。

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The volumetric strain induced by shear stress is shrinking at first, then dilating later under triaxial compression test conditions, of which the value is determined by density and stress state.

三轴压缩试验条件下，剪应力引起的体积变形一般是先剪缩后剪胀的，其大小由密度和应力状态决定。

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