改进的西原模型及其在冻结壁上的应用

CALCULATION OF STRESS AND DISPLACEMENT FIELD OF FROZEN WALL BY IMPROVED NISHIHARA MODEL

  • 摘要: 通过对现有流变模型的分析及结合室内冻黏土大量的单轴蠕变试验,试验结果表明可以忽略冻土的瞬时变形并采用简单的屈服函数对线性牛顿体进行简化,从而对西原模型进行了改进,并导出了改进后模型在三向应力条件下冻土的非线性蠕变方程. 采用改进的西原模型推导了冻结壁应力场和位移场的理论计算公式,探讨了防止冻结管断裂的有效措施.计算和工程实例基本相符,可以应用于工程计算.

     

    Abstract: A great number offrozen clay specimens are used for the long-term creep testsunder single-axial stress states. The results of experiment show thatthe transient deformation of the soil can be neglected and a simple yieldingfunction can be used to replace the linear Newton element, to improvethe Nishihara modelfor the triaxial nonlinear creep of frozen clay. By means of that improved model, a formula is derived to calculate thestress and displacement field of frozen wall.Calculationresults are close to actual situations.

     

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