Wang You, Gao Tian-Ya, Wang Rui, Ding Bo-Song, Ma Yue
School of Civil Engineering, Central South University, Changsha, 410075, China.
Sci Rep. 2025 Apr 28;15(1):14875. doi: 10.1038/s41598-025-99106-5.
Vibrations generated by shield tunnel construction in hard rock strata can have adverse effects on the surrounding environment. To investigate the mutual interference of three-dimensional vibrations and the propagation characteristics of vibration waves during the construction process, this study is based on the shield tunnel project of a Jinan urban rail transit construction zone. The research integrates on-site vibration monitoring, FLAC3D numerical simulations, and theoretical analysis of transfer functions. The results show that: 1)Single-direction vibration input has the greatest impact on the output in the same direction, with minimal interference in the other two directions. A vibration input in one direction generates new harmonic components not only in the same direction but also in the other two directions.2)Vibration generated by shield tunnel construction shows a stronger correlation between the vibration wave propagation speeds in the tunneling direction of the shield machine and the direction perpendicular to the tunneling direction.3)When only a single direction of vibration signal is input, the waveform of the output vibration signal at the monitoring point is similar to that obtained with simultaneous input of three-direction vibration signals, but there are differences in the vibration speed values.4)The vibration monitoring signals from the building pile foundation exhibit periodicity over time, with fluctuations. As the distance from the excavation surface increases, the peak vibration speed decreases, the decay rate slows, and the arrival time is delayed.5)The peak vibration speed at the monitoring point after the shield machine passes is slightly higher than before its passage. The arrival time of the vibration wave at the monitoring point is later after the shield machine passes.6)For vibrations at different locations of the same pile foundation, the vibration speed at the same depth near the tunnel center is the highest. When the distance from the excavation surface is the same, the vibration speed near the bottom of the pile is slightly higher than that at the middle of the pile.
硬岩地层中盾构隧道施工产生的振动会对周边环境产生不利影响。为研究施工过程中三维振动的相互干扰及振动波的传播特性，本研究基于济南某城市轨道交通建设区段的盾构隧道工程。研究综合了现场振动监测、FLAC3D数值模拟以及传递函数的理论分析。结果表明：1) 单向振动输入对同向输出的影响最大，对另外两个方向的干扰最小。一个方向的振动输入不仅会在同向产生新的谐波分量，还会在另外两个方向产生。2) 盾构隧道施工产生的振动在盾构机掘进方向与垂直于掘进方向上的振动波传播速度之间呈现出较强的相关性。3) 当仅输入单一方向的振动信号时，监测点处输出振动信号的波形与同时输入三向振动信号时相似，但振动速度值存在差异。4) 建筑桩基的振动监测信号随时间呈现周期性且有波动。随着距开挖面距离的增加，峰值振动速度减小，衰减速率减慢，到达时间延迟。5) 盾构机通过后监测点处的峰值振动速度略高于通过前。盾构机通过后振动波到达监测点的时间更晚。6) 对于同一桩基不同位置的振动，隧道中心附近相同深度处的振动速度最高。当距开挖面距离相同时，桩底附近的振动速度略高于桩中部。
