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力学与实践 ›› 2006, Vol. 28 ›› Issue (1): 0-0.doi: 10.6052/1000-0992-2005-031

• 应用研究 •    

改进的西原模型及其在冻结壁上的应用

汪仁和 李栋伟 王秀喜   

  1. 安徽理工大学土木工程系矿山建筑重点实验室 安徽 淮南 232001 安徽理工大学土木工程系 安徽 淮南 232001 合肥中国科技大学力学和机械工程系 230027
  • 收稿日期:2005-01-26 修回日期:2005-06-23 出版日期:2006-02-10 发布日期:2006-02-10

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

  • Received:2005-01-26 Revised:2005-06-23 Online:2006-02-10 Published:2006-02-10

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.

关键词: 冻结壁,蠕变,改进的西原模型,应力场,位移场

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

Key words: frozen wall, creep, improved Nishihara model,