摘要
城市轨道交通的减振设计中,除常用的降低刚度外,还可以通过增加阻尼耗散能量的方法进行吸振处理,但相关研究较少。本文提出一种新型的低成本减振措施——橡胶混凝土基础隔振轨道,通过耗散振动能量达到减振目的。采用三维动力有限元模型,施加模拟振动荷载,分析了马蹄形隧道及盾构隧道中,橡胶混凝土整体道床的动力特性及减振效果。研究结果表明:对于同一种隧道结构,两种道床型式下各拾振点的1/3倍频程频谱变化规律基本一致;橡胶混凝土整体道床系统的加速度级均小于普通整体道床系统的加速度级,20Hz以下频段的减振效果更加明显,这对于轨道交通低频振动控制具有十分重要的意义。
Theoretically speaking,there are two different directions to reduce the vibration induced by the railway transit system. One way is to isolate the vibration by getting lower nature frequency,which was common used in the vibration isolation measures design,while the other is to absorb the vibration by raising the damping,which is rarely researched so far. Based on the principle of energy absorption,the Rubber Concrete Monolithic Roadbed( RCMR) was presented in this paper as a low-cost mitigation measure. The three-dimensional dynamic-finite-element model was employed to analyze the dynamic property subjected to the vibration load of the RCMR in both horseshoe-shaped tunnel and shield tunnel. Calculation results indicated that( 1) for the case of the RCMR and the normal concrete material roadbed in the same tunnel structural,the one-third-octave frequency spectrums on the tunnel wall and ground surface were basically the same.( 2) the vibration acceleration level of the RCMR was effectively damped,especially in the range of 0 ~ 20 Hz,which play an important role in contributing to the vibration mitigation for the railway transit system in low frequency range.
引文
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