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采用两阶段分析方法,提出隧道施工对群桩水平位移和内力影响的简化解析计算方法:第一阶段采用Loganathan解析解估算隧道开挖引起的土体水平自由位移场,第二阶段首先基于Winkler地基模型把桩视作弹性地基梁,将自由土体位移施加于桩并建立单桩水平位移控制方程,然后应用简化Mindlin方程,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,并与边界元法分析结果及工程实测数据进行对比,得到了较好的一致性。
A two-stage analysis method is proposed to simplify the analytical calculation of the influence of tunneling on the horizontal displacement and internal force of pile groups. In the first stage, the Loganathan analytical solution is used to estimate the soil horizontal free displacement field caused by tunnel excavation. The second stage is based on Winkler foundation The model treats the pile as a flexible foundation beam, applies the displacement of free soil to the pile and establishes the governing equation of horizontal displacement of single pile, and then uses the simplified Mindlin equation to consider the interaction between the pile group and the pile of the passive group pile, calculates the obstruction effect of the passive group pile Finally, the influence of tunnel excavation on passive group piles is obtained, and compared with the results of boundary element analysis and the measured data of the project, good consistency is obtained.