应力路径对粉土力学特性影响研究

Effect of Stress Path on Mechanical Properties of Silt

为研究平面应变状态下不同应力路径对粉土力学特性的影响,采用平面应变仪,对粉土试样进行不同应力路径下的竖向加荷试验,并比较四种应力路径下土体的偏应力、侧向应变和竖向应变的变化规律,以及强度参数差异性。探究了初始干密度对不同加荷路径下偏应力、侧向应变发展规律的影响。结果表明,应力路径对于应力-应变曲线有很大影响,不同应力路径对土体变形强度影响明显。粉土干密度对于应力-应变曲线影响很大,随着干密度的增大,竖向应变和侧向应变增大幅度减小,呈负相关。

In order to study the effects of different stress paths on the mechanical properties of silt under plane strain,vertical loading tests were carried out on silt samples under different stress paths using a plane strain gauge.The variation rules of the deviator stress,lateral strain and vertical strain,as well as the difference of strength parameters,were compared under four stress paths.The influence of initial dry density on the development law of deviational stress and lateral strain under different loading paths was investigated.The results show that the stress path has great influence on the stress-strain curve,and different stress paths have obvious influence on the deformation strength of soil.The dry density of silt has a great influence on the stress-strain curve.With the increase of dry density,the increase of vertical strain and lateral strain decreases,showing a negative correlation.