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冰川冻土  2014 

深部人工冻结黏土三轴蠕变试验研究

DOI: 10.7522/j.issn.1000-0240.2014.0176, PP. 1479-1483

Keywords: 人工冻土,固结围压,偏应力,三轴蠕变试验

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Abstract:

通过将试样等向固结再冻结,然后保持轴压不变进行径向卸载的实验方法,获得深部冻结黏土在复杂应力状态下的蠕变变形规律.对冻黏土进行了大量的三轴蠕变试验,得到了在冻结温度不同和固结围压不同条件下的蠕变试验结果.结果表明在较低的偏应力水平下,试样只发生前两个阶段的蠕变变形,且蠕变变形量超过总变形量的70%;当试样偏应力值高于某一临界值时会出现加速蠕变阶段,蠕变变形量超过总变形量的80%.可以用改进的Zienkiewicz-Pande抛物线型屈服准则来描述加速蠕变阶段的临界应力.

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