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砂土动应力-应变发展特性试验

Keywords: 循环扭剪,累积特征,动应力-应变关系,孔隙水压力

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Abstract:

对福建标准砂和南沙群岛珊瑚砂进行了不同初始固结条件下的循环剪切试验.试验结果表明,在不同固结条件下动应力-应变发展模式显著不同.在均等固结条件下,动应力-应变关系的循环效应和对称累积特性均十分显著,随着砂土强度的完全丧失累积变形迅速发展;而在非均等固结条件下,当动应力作用平面上具有扭剪应力预剪作用时,剪应变则以单向累积变形为主,当动应力作用平面上只有轴向应力作用时,剪应变循环效应相对较大,累积变形并不显著,即使在循环扭剪荷载作用下,变形仍以轴向变形为主.这种特征似乎与中主应力系数没有显著的依赖关系.

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