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Influence of pile raft stiffness on building behaviour in a tunnel-pile clash scenario

机译：桩筏刚度对隧道桩碰撞情况下建筑物性状的影响

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© The authors and ICE Publishing: All rights reserved, 2015.In a modern urban environment, the underground space becomes increasingly congested due to the high value of the land that forces the new infrastructure projects to be constructed deeper into the ground. For each new project, the potential of both expected and unexpected clashes between new tunnel alignments and the foundations of the existing structures becomes more probable. However, to date, the research on tunnel-pile clashes has been scarce. In the current study, the effects of such a situation are studied by carrying out finite element analyses for a scenario that is typical in the London ground profile. A parametric study was conducted to investigate the influence of the pile raft bending stiffness on the building settlement and the change in piles axial forces. It is shown that an increased raft bending stiffiiess helps to transfer the load from the trimmed pile to the adjacent piles, thus reducing the settlement of the trimmed pile. In the process of tunnel excavation, the pile settles due to the soil-induced downdrag and the loss of both its base and part of its shaft capacity. It is concluded that the tunnel-pile clash has a large impact on the surface structure, piles and tunnel itself.
机译：©作者和ICE出版公司：保留所有权利，2015年。在现代城市环境中，由于土地的高价值迫使新的基础设施项目深入地下，地下空间变得越来越拥挤。对于每个新项目，新隧道路线与现有结构基础之间发生预期和意外冲突的可能性变得更大。但是，迄今为止，关于隧道桩冲突的研究还很少。在当前的研究中，这种情况的影响是通过对伦敦地面剖面中典型的情况进行有限元分析来研究的。进行了参数研究，以研究桩筏弯曲刚度对建筑物沉降的影响以及桩轴向力的变化。结果表明，增加的筏板弯曲刚度有助于将载荷从修整后的桩转移到相邻的桩上，从而减少修整后的桩的沉降。在隧道开挖过程中，桩由于土壤引起的向下拖曳以及其基础和部分竖井承载力的损失而沉降。得出的结论是，隧道桩碰撞对地表结构，桩和隧道本身有很大的影响。

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