Research On Stability Of Ballasted Track With Steel Sleepers Of Mountain Meter-Gauge Under Earthquake

In China,the meter gauge railway for tourism is mostly built in the complicated and dangerous mountainous areas,especially the mountainous rail transit lines planned recently in Sichuan Province are mostly located in the west,belonging to the seismic zone.Under the excitation of earthquake,the ballasted track will produce the phenomenon of loose ballast,especially in the large ramp section,the stress is more complex.In addition,the existing research has achieved fruitful results in numerical simulation and simulation model,but there is still a lack of large scale track test in the whole system in the test,which is difficult to accurately simulate the vibration response of ballast track bed under earthquake action.Based on the research of some tourism meter rail railway project in the west,based on the relevant research of domestic and foreign scholars,combined with the test and numerical simulation,the stability of ballast track bed and the stability of seamless track after earthquake are analyzed and studied under the action of earthquake load.Specifically,the research in this paper will be summarized as follows:(1)The full-scale model test of indoor shaking table was carried out by using the shaking table excited by the horizontal displacement earthquake of Southwest Jiaotong University,taking the ballasted track of meter railway as the research object,and the change of transverse resistance of the ballast bed of meter track and the analysis of the acceleration time history of sleeper during earthquake were analyzed.The stability of ballast bed of meter rail railway under earthquake load was judged by this index,The safety service performance of the meter rail structure under earthquake load is systematically evaluated.(2)The resistance of the ballast bed of meter track under seismic load is analyzed by using the discrete element method.Firstly,the model of the steel sleeper bed is established by using the discrete element software to verify the reliability of the model and the reliability of the seismic acceleration input;Then,the influence of different seismic wave duration,different seismic input direction(vertical,transverse and combined direction)on the resistance of the track bed,the influence of seismic load on the resistance of the meter rail steel sleeper bed under different seismic intensity and the influence of seismic load on the resistance of the meter rail steel sleeper bed under different slope conditions are analyzed.(3)Based on the research on the resistance of ballasted track bed under earthquake load,the transverse stability of meter gauge CWR after earthquake is further studied by using finite element method.The transverse stability of meter gauge CWR under earthquake intensity,curve radius and large ramp is analyzed,and the maximum temperature rise amplitude under different intensity and radius is obtained.