地铁矩形隧道减振垫整体道床参数仿真研究

Simulation study on parameters of monolithic track bed with damping pad in metro rectangular tunnel

为进一步减小地铁车辆运行产生的环境振动影响,提出一种新型矩形隧道减振方案,该方案在减振垫浮置板的基础上,将减振垫的位置下移至隧道衬砌管片与整体道床之间,增大减振垫的簧上质量,从而提高减振效果。文章结合圆形隧道实测数据,建立并校核圆形隧道普通道床有限元模型,再将隧道截面形式更改为矩形作为矩形隧道普通道床有限元模型,通过改变减振垫的厚度、弹性模量以及密度改变减振垫整体道床的减振效果,最后进行参数优化设计。研究表明:①减振垫整体道床相对于既有轨道减振产品具备更好的减振效果,且安全性指标距离标准限值均有较大余量;②减振效果与减振垫厚度成正比,与减振垫的弹性模量成反比,与减振垫的密度关系较小。

To further reduce the impact of environmental vibration generated by the operation of metro vehicles,the article proposes a new type of rectangular tunnel vibration damping scheme,which is based on the floating plate of the damping pad,and the position of the damping pad is shifted downward to the tunnel lining between the pipe sheet and the overall roadbed,so that the spring-loaded mass of the damping pad is increased,thus improving the vibration damping effect.Combined with the measured data of circular tunnel,this article establishes and checks the finite element model of ordinary track bed of circular tunnel,and then changes the tunnel section form to rectangle as the finite element model of ordinary track bed of rectangular tunnel,and changes the damping effect of the overall roadbed of the damping pad by changing the thickness,elastic modulus,and density of the damping pad,and then finally carries out the parameter optimization design.The research shows that:①the damping pad monolithic track bed has better damping effect than the existing track damping products,and there is a large margin between the safety index and the standard limit.②the damping effect is directly proportional to the thickness of the damping pad,inversely proportional to the elastic modulus of the damping pad,and has a relatively small relationship with the density of the damping pad.