基于流固耦合的浸水钢弹簧浮置板减振效果分析

Analysis of the Vibration Effect of Floating Slab Track Soaked in Water Using Fluid-Solid Coupling

为养护维修浸水情况下的浮置板轨道,基于流固耦合理论建立浸水条件下钢弹簧浮置板振动模型,分析浮置板和基础结构间存在积水情况时,车致振动影响下不同浸水深度浮置板轨道的减振效果。结果表明:钢弹簧浮置板的板底积水影响浮置板结构的减振性能;当积水深度小于板侧空间高度的1/2时,隧道壁在其峰值频率63 Hz的振动已经增大5 dB左右;当积水深度达到板侧空间高度全满时,隧道壁加速度级在63 Hz处增大13.4 dB,增加约30.7%;隧道壁在63 Hz和80 Hz的振动级插入损失也分别增大13.36 dB和13.67 dB;浮置板板侧空间有1/2及以上的高度浸水,峰值频率对应的浮置板、隧道壁的垂向振动级较正常情况分别大5d B、10dB以上时,建议及时排水。

To provide maintenance advice regarding a scenario in which floating slab tracks are soaked in water,we established a numerical model of a submerged steel spring floating slab track vibration based on the fluid–solid coupling theory.The vibration reduction of the floating slab track with different accumulation water depths under a running train considering the track,water,and tunnel base was analyzed.The results showed that the water under the floating slab influences the vibration reduction performance.When the depth of the accumulated water was lower than the 1/2 height of the slab-side space,the effect on the vertical vibration of the tunnel increased by approximately 5 dB at a peak frequency of 63 Hz.When the water filled with the entire height of the slab side space,the vertical vibration level of the tunnel at its peak frequency of 63 Hz increased to approximately 13.4 dB,an increase of 30.7%.The insertion loss of the tunnel vibration level also increased by approximately 13.36 and 13.67 dB at 63 and 80 Hz,respectively.Therefore,when the height of the water under the floating slab was over the 1/2 height of the slab side space,which means that the vertical vibrations of the slab and tunnel at their peak value frequency were larger than 5 and 10 dB,respectively,than under normal conditions without water,maintenance work to drain away the water should be performed immediately.