Study on spatial mechanical characteristic of high-speed railway ballastless slab track on subgrade

摘要

By using beam element to model rail,spring element to model fastener,solid element to model different components of ballastless track,contact element to model the connection between each component of ballastless track,a statics three-dimensional nonlinear finite element mechanical model for calculating the forces transmission among rail,fastening and different component of ballastless slab track on subgrade was established.Experimental data of Suining-Chongqing railway line was given to validate the calculation model.Force of ballastless slab track on subgrade under gravity load,train load,uneven settlement load,temperature gradient load as well as combined load was analyzed.Results show that:spatial forces characteristic of ballastless slab track is very notable under train load; uneven settlement load as well as temperature gradient load has significant influence on the mechanical characteristic of ballastless slab track; force of ballastless slab track increases significantly under combined load than that of under any single load.