山区铁路小半径曲线强化轨道动力性能

Dynamic performances of small-radius curved track for mountain strengthened railway

基于系统工程思想,运用机车车辆-轨道耦合动力学理论,对采取了强化技术对策后的山区铁路小半径曲线轨道的动力性能进行仿真计算,并与强化前轨道结构动力学性能进行了对比分析。分析结果表明:强化后轨道结构的轮轨动态相互作用力及轨枕支点压力均较强化前的相应值略大,但皆属相同安全合格等级;强化轨道结构位移大幅度降低,有效抑制轨道结构变形,增强线路稳定性,尤其是钢轨横向位移和轨距动态扩大量较强化前下降十分显著,前者仅约为后者的1/3左右;强化轨道也有利于降低轨下结构振动和减轻列车提速后对轨下基础的破坏。

New strengthening technologies of laying concrete sleeper and matching measurement have been adopted to raise train speeds on the small-radius curved tacks of Chinese mountain railways. In order to investigate the dynamic performances of the curved track structure, the dynamic properties of the strengthened track and the unstrengthened track were compared based on system engineering theory and vehicle-track coupling dynamics. Analysis result shows that the dynamic interaction between wheel and rail and the rail-pad force of the strengthened track are little bigger than those of the unstrengthened track, the safety grades of the tracks are same, the strengthened track can benefit to decrease the displacements of all components of track structure obviously, to restrain the deformation of track effectively, and to reinforce the stability of railway, especially the lateral displacement and the gauge enlargement of the strengthened rail are about 33~ of original rail. Furthermore, the strengthened track can help to reduce the vibration of the sub-rail structure and to lighten the destruction of track caused from raising train speeds. 5 tabs, 9 figs, 6 refs.