中低速磁浮交通低置路基动力特性三维数值分析

Dynamic Characteristics of Low Subgrade for Medium and Low Speed Maglev Based on the Three-dimensional Numerical Simulation

运用Abaqus和Fortran联合仿真,建立基于无限元人工边界条件的磁悬浮列车-轨道梁-路基-地基耦合系统,研究中低速磁浮交通在中速行车状态下不同行车速度,基床刚度,基床阻尼对低置路基动应力分布和传递规律的影响。结果表明:路基动应力随着运行速度的增加而增加,但对0.6 m以下路基的动应力影响不大;不同的基床刚度,基床刚度越大,路基表层动应力越大,但增加幅度逐渐趋缓,当路基在0.6 m以下时,动应力随基床刚度的增大而减小;不同基床阻尼对路基表层的动应力没有影响,但对路基下不同深度处的动应力影响较大,基床阻尼越大,深度越大的路基动应力越小,动应力的衰减幅度越大。

The joint simulation method of Abaqus and Fortran to build the three-dimensional finite element analysis model of maglev train-track beam-subgrade-foundation coupling system based on the artificial boundaries condition for infinite element. The effects of different driving speed, subgrade stiffness and damping of subgrade bed on dynamic stress distribution and transmission law of low subgrade for medium and low speed maglev under medium speed driving are studied. The results show that the subgrade dynamic stress increases with the increase of running speed, and has little effect on the subgrade below 0.6 m;Under the condition of different subgrade bed stiffness, the greater the stiffness of subgrade bed, the greater the dynamic stress on the surface of subgrade, but the increasing amplitude is gradually slowing down, the dynamic stress of subgrade decreases with the increase of subgrade stiffness when the subgrade below 0.6 m;Different subgrade damping has no effect on the dynamic stress of the surface of subgrade, but it has a great influence on the dynamic stress at different depths under the subgrade, the larger the subgrade damping is, the smaller the dynamic stress of subgrade is, the greater the attenuation amplitude of dynamic stress is.