轨道结构参数变化对隧道振动的影响

The influence of track structure parameters on tunnel vibration

鉴于轨道结构的多样性以及轨道结构参数变化导致的轨道结构振动频率特征的复杂性,建立了单轮对轮轨耦合有限元模型,分析了扣件垂向刚度变化对整体道床、隔离式减振垫浮置板以及钢弹簧浮置板轨道振动的影响,此外还分析了板下支座刚度变化对两种浮置板轨道结构振动的影响。结果表明:增大扣件刚度,3种轨道结构在50.00 Hz以下频率段的振动加速度级变化差异较大,100.00~200.00 Hz频率段内的振动加速度级均增强;增大支座刚度,钢弹簧浮置板工况下的道床和隧道壁振动加速度级变化幅度较大,其中道床振动加速度级减小最为明显。

Aiming at the complexity of the vibration frequency characteristics of track structure caused by the diversity of track structure and parameters changing of track structure,it establishes the pair of single wheel coupling finite element model,analyzes the effect of fastener vertical stiffness to the track,isolation type damping pad floating slab and steel spring floating slab track vibration,obtains the relation between the bearing stiffness and two kinds of floating slab track structure vibration.The results show that:with the increasing of the fastener stiffness,the vibration acceleration levels of the three orbital structures in the frequency segment is below 50.00 Hz greatly,and the vibration acceleration levels in the frequency segment are all enhanced between 100.00 Hz and 200.00 Hz.With the increasing of bearing stiffness,the vibration acceleration of the track bed and the tunnel wall under the condition of steel spring floating plate changes greatly,among which the vibration acceleration of the track bed decreases most obviously.