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)。
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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