In order to provide a theoretical basis for the design and optimization of ballast mat on railway culvert, a vertical coupling dynamical model for a vehicle-track-culvert system was established based on the wheel-rail coupling dynamics theory and the finite element method. LS-DYNA, a large-scale dynamical analyzing program, was used to analyze the time-frequency characteristics of dynamic responses of vehicle, track and culvert with and without using the vibration mitigation measure of ballast mat. In addition, the proper rigidity of the ballast mat was investigated. The results show that the adoption of the vibration mitigation measure does not aggravate wheel-rail dynamic interaction and affect the running safety of trains. Furthermore, the measure can evidently decrease the dynamic response of culvert, while rarely influence rail vibration. It has a certain damping effect on the vibration of sleeper, but has a negative influence on ballast vibration. The proper rigidity of ballast mat is suggested to be from 50 to 100 MPa/m.
李培刚 刘学毅 郝远行. 涵洞地段道砟垫的减振特性[J]. 西南交通大学学报, 2012, 47(2): 192-197.
LI Peigang, LIU Xueyi, HAO Yuanxing. Damping Characteristics of Ballast Mat on Culvert. Journal of SouthWest JiaoTong University, 2012, 47(2): 192-197.