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首页> 外文期刊>International journal of geotechnical engineering >Orientation of locally drained shear bands in contractant clays
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Orientation of locally drained shear bands in contractant clays

机译：收缩黏土中局部排水的剪切带的取向

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摘要

A slip surface or shear band orientation of 45° from the minor principal stress is obtained when contractant clays are numerically analyzed while assuming undrained conditions. This orientation occurs because the shear band is modeled as undrained and with no volume change. However, thin shear bands induce the dissipation of pore water to the outside body, and depending on the degree of local drainage, the incipient shear bands are then no longer at 45°. In drained conditions, the incipient shear band inclination to the minor principal stress is controlled by the friction angle, the dilatancy angle or a combination of both. This paper examines the orientation of a developing shear band, accounting for the effects of local pore water pressure flow away from the shear band to investigate whether the orientation of the band is controlled by the degree of drainage (i.e. volume change) or the mechanisms of shear band orientation under fully drained conditions. The numerical results show that the band's inclination can be ＞45° for globally undrained contractant clays sheared at rates of ＜10%/h, rates that are normal in laboratory testing.
机译：当假设不排水条件下对黏性黏土进行数值分析时，可从次要主应力获得45°的滑移面或剪切带取向。之所以会发生这种方向，是因为剪切带被建模为不排水且没有体积变化。但是，细的剪切带会导致孔隙水散发到外部，根据局部排水的程度，初始剪切带将不再处于45°。在排水条件下，初始剪切带对次要主应力的倾斜度由摩擦角，膨胀角或两者的组合控制。本文研究了剪切带的发展方向，考虑了局部孔隙水压力离开剪切带的影响，从而研究了剪切带的方向是由排水程度（体积变化）还是由排水机理控制的。完全排水条件下的剪切带取向。数值结果表明，对于整体不排水的收缩黏土，以＜10％/ h的速度剪切时，该带的倾角可以大于45°，这在实验室测试中是正常的。

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