地铁振源‑传播路径协同控制全频段环境振动方法研究

Full frequency band control method of environmental vibration based on the coordination of metro vibration source and propagation path

  • 摘要: 地铁采用钢弹簧浮置板轨道降低对沿线敏感目标的环境振动影响,但在固有频率处存在振动放大问题。为降低浮置板轨道固有频率处振动放大对周围环境的负面影响,本文基于周期结构带隙理论提出低频隔振排桩结构以及考虑频率匹配的地铁振源‑传播路径协同控制全频段环境振动方法,通过建立三维地铁列车‑浮置板轨道耦合频域解析模型及三维道床‑隧道‑土层‑排桩有限元模型分析该方法对车致环境振动的控制效果。研究表明:针对浮置板轨道固有频率设计的周期性排桩带隙范围为7~9 Hz,可使地表拾振点处在浮置板固有频率附近频段的振动加速度级降低4~7 dB,消除了轨道固有频率处振动放大的不利影响;相比普通轨道,地铁振源‑传播路径协同的环境振动控制方法有效降低了地表拾振点处全频段的振动水平,具有良好的车致环境振动控制效果。

     

    Abstract: Steel spring floating slab tracks are equipped to reduce the vibration impact on precision instruments along the metro lines, but the ground vibration would be amplified at the natural frequency of the tracks. In order to address the negative impact of natural frequency vibration amplification on the surrounding environment of floating slab track, a full frequency control method considering frequency matching for environmental vibration in collaboration with metro vibration sources and propagation paths is proposed, which is based on the theory of periodic structure bandgap structure. The effectiveness of this method is analyzed by establishing a three-dimensional metro train-floating slab track coupling model and a finite element analysis model of track bed-tunnel- soil-row piles. The research results show that the ground vibration can be reduced about 4~7 dB at the natural frequency of the floating slab track plate by adjusting the band gap range of periodic pile to 7~9 Hz, eliminating the adverse effect of vibration amplification at the natural frequency of the track. Compared to ordinary tracks, the environmental vibration comprehensive control method proposed in this article has good vibration control effects and can effectively reduce the vibration level of sensitive points on the ground in the full frequency range.

     

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