隧道开挖对群桩竖向位移和内力影响分析

采用两阶段分析方法,提出了隧道开挖对群桩竖向位移和内力影响的解析计算方法。第一阶段采用Loganathan解析解估算隧道开挖引起的土体自由位移场,第二阶段首先基于Winkler地基模型,将自由土体位移施加于桩体并建立单桩位移控制方程,然后应用剪切位移法,考虑被动群桩的桩–桩相互影响,计算被动群桩的遮拦效应,最后得到隧道开挖对被动群桩的影响。并与有限元法以及边界元法分析结果进行了对比,得到了较好的一致性。

Analysis of settlement and internal forces of group pile due to tunneling

A simple analytical two-stages method for determining the settlement and internal forces of group pile caused by tunneling was present here. The Loganathan analytical solution was used to estimate the free soil settlement induced by tunneling in the first stage. In the second stage, composing the soil movement to the pile, the settlement governing equilibrium equation of single pile was built up based on Winkler model. Then the shielding effect due to pile-pile interaction of passive group pile was computed using integral method. Finally the response of passive group pile due to tunneling was obtained. The obtained result was compared with that from FEM and BEM, and good agreement was obtained.