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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.
The creep and deformation law of deep frozen clay under complicated stress state was obtained by experimental methods such as re-freezing the specimen to the direction of consolidation, and then unloading the specimen with constant axial pressure. A large amount of triaxial creep The creep test results under different conditions of different freezing temperature and confining confining pressure are obtained.The results show that creep deformation occurs only in the first two stages at lower deviatoric stress level, Variable deformation of more than 70% of the total deformation; when the sample is higher than a certain critical value of stress creep stage occurs, the creep deformation of more than 80% of the total deformation can be improved Zienkiewicz-Pande A parabolic yield criterion is used to describe the critical stresses in the accelerated creep phase.