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非饱和击实粉土强度特性的试验研究

Keywords: 非饱和土,三轴试验,吸力,强度特性

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Abstract:

为研究非饱和土样的强度特性及吸力对非饱和土强度的影响,采用GDS非饱和土三轴仪,对非饱和击实粉土样进行了控制吸力的三轴排水剪切试验.试验结果表明:对于同一土体,吸力对其有效黏聚力和有效内摩擦角影响较小,但对吸力内摩擦角有着显著影响;吸力对土体具有一定的强化作用,相同围压、相同应变土样的偏应力随吸力的增大而增加;吸力对土体应力-应变关系曲线的形式影响不大,曲线形式主要取决于土体自身的性质和其应力历史;吸力和吸附强度之间存在着良好的乘幂关系,据此可将Fredlund提出的抗剪强度公式改写成以吸力为直接变量的抗剪强度公式.

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