Faculty of Engineering, China University of Geosciences, Wuhan, 430074, China.
School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
Environ Sci Pollut Res Int. 2021 Mar;28(11):13671-13689. doi: 10.1007/s11356-020-11627-w. Epub 2020 Nov 14.
The floating slab track is considered one of the most effective track structures to reduce the adverse effects of underground railway noise and vibration. This paper reports a new type of rubber-spring float track (RSFS), which adopts a well-designed rubber-spring vibration isolator and is conceptually designed as a float track structure. The dynamic performance of different track structures, namely RSFS track, fixed slab track, and transition section, were studied. Vibration response of the car body and the track structure was obtained. Internal noise from the train and external noise near the tracks were also recorded. The results show that the measured track structures can ensure the safety of train operation. Compared with the fixed plate track, the RSFS track has a good vibration isolation effect, and the RMS vibration reduction at the tunnel wall was 15.1 dB. However, it amplifies the vibration above the isolation layer and slightly increases the internal noise of the train. RSFS track structure should be evaluated comprehensively before implementation. In addition, the track stiffness has a significant impact on the vibration level of the track, thus affecting the vibration isolation effect. The noise distribution inside the train is not uniform and is not sensitive to the stiffness of the track structure. Due to the uncertainty of train-induced vibration, a probabilistic framework is needed to evaluate or predict the train-induced environmental vibrations.
浮置板轨道被认为是减少地铁噪声和振动影响的最有效轨道结构之一。本文介绍了一种新型橡胶弹簧浮置轨道（RSFS），它采用了经过精心设计的橡胶弹簧隔振器，并被概念性地设计为浮置轨道结构。研究了不同轨道结构，即 RSFS 轨道、固定板轨道和过渡段的动力性能。获得了车体和轨道结构的振动响应。还记录了列车内部噪声和轨道附近的外部噪声。结果表明，所测量的轨道结构能够确保列车运行的安全。与固定板轨道相比，RSFS 轨道具有良好的隔振效果，隧道壁处的 RMS 振动减少了 15.1dB。然而，它放大了隔离层上方的振动，并略微增加了列车的内部噪声。在实施之前，应综合评估 RSFS 轨道结构。此外，轨道刚度对轨道的振动水平有显著影响，从而影响隔振效果。列车内部的噪声分布不均匀，对轨道结构的刚度不敏感。由于列车引起的振动的不确定性，需要概率框架来评估或预测列车引起的环境振动。
