To explore the impact of uneven settlement of ballastless track subgrade and stiffness variation on the safety of train operation and service performance of the track,the paper takes the CRTS Ⅲ slab ballastless track as the research object,establishes a nonlinear analysis model of the CRTS Ⅲ slab ballastless track based on the fi-nite element method to study the deformation characteristics of the track structure under the action of uneven sub-grade settlement.By combining the multi-body dynamics method,it establishes a dynamic model of the vehicle-track-subgrade coupled system to analyze the dynamic response of the coupled system under the effects of settle-ment and stiffness variation.The results show that with the increase of settlement amplitude,voiding will gradually occur;as the settlement wavelength increases,the settlement difference between the ballastless track and the sub-grade surface will decrease.Under the combined action of uneven subgrade settlement and stiffness variation of fas-teners,an increase in fastener stiffness will lead to a decrease in the vertical displacement of the rail and an in-crease in the arch deformation on the track slab.This combined action will increase the dynamic response,affecting the safe operation of vehicles and the stress on the track structure.
关键词
路基不均匀沉降/刚度变异/有限元分析/车辆动力学性能
Key words
uneven subgrade settlement/stiffness variation/finite element analysis/vehicle dynamic perfor-mance
维普
万方数据