土的可恢复剪胀的一种解释

A kind of explanation of reversible dilatancy of soils

从土的各向异性角度对土的可恢复剪胀现像进行了解释。基于各向异性情况下的土体弹性本构关系理论分析,认为土的可恢复剪胀现象可部分归因于土的各向异性引起的弹性剪胀。借助有关土体弹性参数实验结果,研究了应力诱导各向异性对土体弹性剪胀的影响,结果表明:随土体应力诱导各向异性的增大,土体的弹性剪胀也增大。从土体弹性剪胀角度研究了土的卸荷体缩条件,认为土体卸荷体缩取决于加载应力路径的应力增量比,给出了土体出现卸荷体缩的区域。

The reversible dilatancy of soils was studied from the viewpoint of anisotropy of soils.Based on the theoretic analysis of the anisotropic elastic constitutive relation,the reversible dilatancy was partly explained by the elastic dilatancy deformation caused by soils anisotropy.Grounded on the relevant experimental results of soils elastic parameters,the influence of stress-induced anisotropy on elastic dilatancy of soils was studied.It was found that the elastic dilatancy of soils increases with the rise degree of stress-induced anisotropy.In the light of elastic dilatancy of soil,the condition of volume-contraction in unloading of shear tests was studied.It was obtained that volume-contraction in unloading of shear tests is controlled by the ratio of generalized deviatoric stress increment and the mean stress increment of loading stress path,the region of volume-contraction in unloading of shear tests was provided also.