THE PREDICTION OF SURFACE SETTLEMENT PROFILES DUE TO TUNNELLING
THE PREDICTION OF SURFACE SETTLEMENT PROFILES DUE TO TUNNELLING
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发表时间：
1993
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通讯作者：
M. Gunn
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作者：
M. Gunn
最近的工作表明，在预测开挖附近的地表移动时，模拟土体的小应变刚度是重要的。本文描述了超固结粘土不排水特性的简单本构关系。幂定律表达式决定了土体在小应变下的非线性弹性刚度。当不排水抗剪强度被调动时，土体的屈服符合特雷斯卡准则。该模型已在岩土有限元程序CRISP中实现。本文介绍了该模型在隧道开挖引起的地表移动预测中的应用。与没有模拟小应变刚度的分析相比，预测结果有了很大的改善。与基于现场数据的经验关系的比较表明，虽然“地基损失”预测是现实的，但预测的整体沉降剖面仍然太宽，最大沉降量约为实际观测的一半。(A)封面摘要见IRRD 859983。
Recent work has shown the importance of modelling the small strain stiffness of soil when predicting ground movements adjacent to excavations. This paper describes a simple constitutive relation for the undrained behaviour of overconsolidated clays. A power law expression determines the non-linear elastic stiffness of the soil at small strains. When the undrained shear strength is mobilised the soil yields according to the Tresca criterion. This model has been implemented in the geotechnical finite element program CRISP. The paper describes the application of this model to the prediction of ground surface movements caused by tunnelling. Comparison with analyses which do not model small strain stiffness demonstrate a dramatic improvement in the predictions. Comparisons with empirical relations based on field data indicate that although the 'ground loss' prediction is realistic, the overall settlement profile predicted is still too wide, the maximum settlement being about half that observed in practice. (A) For the covering abstract see IRRD 859983.