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硬岩地层中盾构隧道施工引起的不同距离处桩的振动响应。

Vibration response of piles at different distances induced by shield tunneling in hard rock strata.

作者信息

Wang You, Ma Yue, Wang Rui, Ding Bosong, Yu Siyuan

机构信息

College of civil engineering, Central South University, 410075, Changsha, Hunan , China.

出版信息

Sci Rep. 2024 Sep 17;14(1):21723. doi: 10.1038/s41598-024-72987-8.

DOI:10.1038/s41598-024-72987-8
PMID:39289486
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11408501/
Abstract

Excavation of subway tunnels in hard rock generates strong vibration waves that pose potential risks to the stability of surrounding structures. In this study, the discrete element method-finite difference method (DEM-FDM) coupling was adopted to build the model of tunnel structure-rock-pile, which was validated by field monitoring data. Then, the vibration response of piles under various pile-tunnel spacings was analyzed, revealing the occurrence of vibration peak rebound phenomena within certain distance ranges. The range of vibration effects was categorized. Furthermore, in shield tunneling construction, the energy induced by vibrations was mainly concentrated within the 50 Hz range. Low-frequency vibrations result in a wider effect range. The study also demonstrated that within a 1d (tunnel diameter) range of the pile-tunnel spacing, the vibration induced by shield tunneling construction had a more significant effect. As the pile-tunnel spacing increased, the piles transitioned from being subjected to bending forces to experiencing bending-shear forces. Finally, the vibration effects on the existing piles were evaluated under field working conditions. It also provided suggestions for construction based on the effects and laws of the pile dynamic response.

摘要

在硬岩中开挖地铁隧道会产生强烈的振动波，对周围结构的稳定性构成潜在风险。本研究采用离散元法-有限差分法（DEM-FDM）耦合建立隧道结构-岩石-桩体模型，并通过现场监测数据进行验证。然后，分析了不同桩-隧道间距下桩体的振动响应，揭示了在一定距离范围内出现振动峰值反弹现象。对振动影响范围进行了分类。此外，在盾构隧道施工中，振动产生的能量主要集中在50Hz范围内。低频振动导致的影响范围更广。研究还表明，在桩-隧道间距1d（隧道直径）范围内，盾构隧道施工引起的振动影响更为显著。随着桩-隧道间距的增加，桩体受力从受弯转变为弯剪。最后，在现场工况下评估了对既有桩体的振动影响。并根据桩体动力响应的影响和规律为施工提供了建议。

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