Study on spatial mechanical properties of pre-cast slab track system in subway line

In order to overcome the limitations in the theoretical research of spatial mechanical properties, a three-dimensional nonlinear finite element mechanical model for pre-cast slab track system in subway line was established. With the model, the mechanical properties of pre-cast slab track system in ordinary section and vibration-reduction section in subway line under train load, uneven settlement load of underlying foundation of slab track, temperature load of slab track as well as combined load were analyzed. The main findings in this paper are as follows. Train load and uneven settlement load of underlying foundation of slab track have large influence on the mechanical properties of pre-cast slab track system, while temperature load of slab track only has some influence on the mechanical properties of restriction stopper. There is large difference between the mechanical properties of pre-cast slab track system in ordinary section and vibration-reduction section in subway line under train load, uneven settlement load of underlying foundation of slab track as well as combined load. There is noticeable difference between the added calculation result for each load and the corresponding result under combined loads, it is recommended to analyze and study the mechanical properties of pre-cast slab track system in subway line under combined loads. Contact nonlinear between interlayer and mutual interaction between restriction stopper and slab should be considered in the finite element mechanical model for pre-cast slab track system in subway line. © 2020, Central South University Press. All rights reserved.