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<p>The environmental vibration generated by train operations in multiple existing tunnels closely intersecting are complex. Therefore, 3D full-scale numerical models for dynamic analysis were established based on an ongoing tunnel construction in Chongqing, China. The dynamic response measured in actual engineering verified the rationality of the numerical model. Moreover, the dynamic interaction between six adjacent tunnels within a volume of 2700 cubic meters was analyzed. On this basis, the impact of different operating conditions of trains in existing tunnels on the new tunnel was discussed. The results show that there is a sudden increase in acceleration at about 1.0&#xa0;s in the longitudinal middle section of the new tunnel. This is because all the trains in operation are roughly at the intersection with the plane of the new tunnel when trains start running 1.0&#xa0;s. Additionally, the impact of the number of trains running in the existing tunnel on the dynamic response of the new tunnel may not increase linearly, but exponentially. It is worth noting that the reinforcement of the cross sections near multiple tunnel intersections should focus on the top of the section, while that farther away should focus on the section bottom. The research results provide a theoretical basis for the environmental vibration assessment of complex and multiple intersecting tunnels in modern cities. Based on the varying dynamic responses at different positions of the newly built tunnel section, reasonable layout of vibration reduction facilities can enhance passenger comfort. </p>

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Environmental vibration of newly built tunnels caused by the operation of multiple adjacent existing railway lines

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Qi Wu,
  • Maoyi Liu,
  • Xuanming Ding,
  • Qiang Ou,
  • Yanling Zhang

摘要

The environmental vibration generated by train operations in multiple existing tunnels closely intersecting are complex. Therefore, 3D full-scale numerical models for dynamic analysis were established based on an ongoing tunnel construction in Chongqing, China. The dynamic response measured in actual engineering verified the rationality of the numerical model. Moreover, the dynamic interaction between six adjacent tunnels within a volume of 2700 cubic meters was analyzed. On this basis, the impact of different operating conditions of trains in existing tunnels on the new tunnel was discussed. The results show that there is a sudden increase in acceleration at about 1.0 s in the longitudinal middle section of the new tunnel. This is because all the trains in operation are roughly at the intersection with the plane of the new tunnel when trains start running 1.0 s. Additionally, the impact of the number of trains running in the existing tunnel on the dynamic response of the new tunnel may not increase linearly, but exponentially. It is worth noting that the reinforcement of the cross sections near multiple tunnel intersections should focus on the top of the section, while that farther away should focus on the section bottom. The research results provide a theoretical basis for the environmental vibration assessment of complex and multiple intersecting tunnels in modern cities. Based on the varying dynamic responses at different positions of the newly built tunnel section, reasonable layout of vibration reduction facilities can enhance passenger comfort.