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低围压下,由于吸力的存在,非饱和砂土相对于饱和砂土在剪切过程中会发生更大的体积变化,即剪胀,在整个应力应变行为中出现明显的剪胀和峰值特征点。基于此,本文基于相变状态定义状态参量β,考虑水力-力学性质耦合,引入模型参数,分别在一般应力空间和三轴应力空间建立非饱和砂土的边界面本构模型。结果表明:在给定围压下,剪胀随着吸力的增加而增加,并伴随着体积增大,剪切强度提高。
Under low confining pressure, due to the existence of suction, the volume change of unsaturated soils relative to that of saturated soils during shearing is larger, ie, dilatancy, with obvious dilatancy and peak characteristics in the whole stress-strain behavior point. Based on this, the state parameter β is defined based on the state of phase transition, and the coupling of hydraulic and mechanical properties is considered. The model parameters are introduced to establish the boundary surface constitutive model of unsaturated sands in general stress space and triaxial stress space respectively. The results show that at a given confining pressure, the dilatancy increases with the increase of suction force and the shear strength increases with the volume increase.