Research On Vertical Stability Of The Longitudinal Coupled Slab Track

Recently, with the fast development of high-speed railway construction, there are a variety of problems during the slab tracks’service, such as, spalling of slab concrete, interlayer connections damages and spacing mechanism failure, and the diseases may affect the track structure and high-speed traveling. This article is about the longitudinally continuous slab track upwarping, based on the CRTS Ⅱ slab track on bridges, combined with field surveys, applying the structure stability theory to establish the analysis model and method of vertical stability of CRTS Ⅱ slab track on bridges, which are used to carry on the deeply research of the effect of the slab track upwarping on its vertical stability.Firstly, by investigating the up-warping of slab track in the highspeed railway, combined with the characteristics of the CRTS Ⅱ slab track and force transmission, preliminary analysis for the causes of the longitudinally continuous slab track upwarp is conducted.Secondly, according to the structural characteristics of the CRTS Ⅱ slab track on bridges with slab upwarping, based on the first and second stability theory, the slab track vertical stability analysis model established through simplified rational mechanics is used to get the effect from slab track upwarp to structure vertical stability.Then, the effects from sectional flexural stiffness, gravity and the interlayer bonding stress to the slab track stability are calculated in turn, by use of the slab track vertical stability analysis model, to put forward some preliminary methods for improving the slab track vertical stability.Finally, based on the finite element method, the numerical simulation analysis about the CRTS Ⅱ slab track vertical stability on bridges has been carried out to get the allowable temperature rising, which is compared with the analytical result. The comparation proves the slab track nonlinear buckling analysis model reasonable and reliable.