To evaluate the influence of upper arch deformation on the safety of train operation on ballastless track inside high-speed railway tunnels,the upper arch deformation characteristics of different ballastless tracks were obtained based on measured data.Subsequently,a dynamic calculation model of the coupled system of uplift arch filler layer-ballastless track-vehicle was established.The impact of different upper arch deformation characteristics on the dynamic response of the vehicle was determined by using the calculation model,thereby assessing the safety of high-speed train operation.The results show that the measured wavelength is mainly distributed in 3 to 30 m and the amplitude is mainly distributed in 0 to 8 mm,among which the upper arch deformation is the most prominent with a wavelength of 10 m and an amplitude of 2 mm.When the upper arch wavelength is less than 6 m,the peak value of wheel-rail force is larger,and when the upper arch wavelength is about 12 m,the peak value of vertical acceleration of the vehicle is larger.The upper arch,with a wavelength of about 6 m,has a significant impact on high-speed driving safety and has a certain derailment risk,which should be paid more attention.
high-speed railway tunnelballastless trackupper arch deformationsecurity of drivingdynamic response
NETL
NSTL
万方数据
