Study of train derailment due to rail irregularities induced by frozen soil effect

Abstract

The thesis mainly introduces the settlement effect on the train traffic safety In winter due to the cold weather the permafrost leads to settlement of the rail and the rail subsidence is inhomogeneous so that the train can be derailed induced by this type of settlement The phenomenon is particularly serious in the northwestern part of mainland China Thus the train is not safe to travel on the settled and irregular rail Moreover if the train travels very fast it may cause derailment We generated the finite element model of the train moving on the embankment with the sine wave settlement and track irregularities and the introduction of derailment coefficient was then used to evaluate the safety of the train The rail model is JIS 60kg the weight of the train is 595t and the length of the train is 295m We analyze the case of a train driving by using the FEA method for about 4 seconds on the settled and irregular rail with the time step length of 0 002 seconds The results show that the higher the speed the settlement amplitude and the rail irregularities the higher the derailment coefficient of the train The higher the settlement wavelength the lower the derailment coefficient of the train

Date of Award	2018 Jun 21
Original language	English
Supervisor	Shen-Haw Ju (Supervisor)