目前,国内部分地铁设计速度已达120 km/ h,有必要针对该速度条件下的减振垫浮置板动力特性以及减振垫刚度取值等问题展开专门研究。基于有限元软件,建立车辆-轨道-隧道耦合动力学模型,可对120 km/ h 速度条件下地铁车辆、钢轨、减振垫浮置板,以及隧道结构等细部结构的动力学特性进行详细的研究。经计算和检算可知,在减振垫浮置板上运行120 km/ h 速度的地铁 A 型车,其各项动力学指标均满足动力学检算标准；同时计算结果表明,减振垫面刚度宜取0.01~0.02 N/ mm3.%As designed metro speed has reached 120 km/ h, it is necessary to conduct a research on the characteristics of the damping pad floating slab and selection of damping pad stiffness. Based on FEM software, a vehicle-track-tunnel coupled dynamic model is established to study the dynamic characteristics of metro vehicle, rail, floating slab track and tunnel under the action of 120 km/ h train speed. The results of calculation and verification show that when type A vehicle of 120 km/ h runs on damping pad floating slab track, various dynamic indexes of the vehicle meet the dynamic verification standards. Meanwhile, the calculation results demonstrate that the stiffness of damping pad should be 0. 01 ~ 0. 02 N/ mm3 .
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