利用Periodic Fourier法研究橡胶混凝土隔振基础对轨道振动的影响

摘要

A novel type of a crumb rubber concrete(CRC)foundation was proposed for vibration reduction of railway tracks of subways. The Periodic-Fourier method was adopted to build the mathematical model and analyze the influence of different physical parameters of the CRC foundation on the vibration displacement of the rails. The results show that in com-parison with the conventional foundations, the rail displacement induced by high-frequency excitation is greatly reduced, and the rail displacement induced by high-frequency excitation is smaller than that by low-frequency excitation;the larger stiffness of the CRC foundation can lead to larger resonant frequency and smaller vibration displacement of the rails;increas-ing the damping of the CRC foundation can reduce the resonant frequency and the vibration displacement of the rails.%地下铁道轨道减振措施研究是一个受到持续关注的问题，本文创新性地引入橡胶混凝土隔振基础这一概念。并利用Peiodic-Fourier方法，探讨了橡胶混凝土隔振基础物理参数对钢轨振动位移的影响。研究结果表明（：1）高频激励荷载引起的钢轨位移比低频激励荷载引起的钢轨位移小；（2）橡胶混凝土隔振基础刚度越大，相应的共振频率越大，但引起的钢轨振动位移越小；（3）橡胶混凝土隔振基础阻尼越大，相应的共振频率越小，且引起的钢轨振动位移也越小。