Dynamic Simulation Analysis of Slab Ballastless Track Subgrade of High-Speed Railway

With the development of high speed railway, ballastless track has been more widely used because of its own merits. Different track types lead to changes of dynamic properties in the railway structure. To discuss the dynamic interaction in the system of track and subgrade under train loads, the dynamic simulation method of ballastless track-subgrade system was studied using the ABAQUS finite element software. Based on this, the 3D model of slab ballastless track-subgrade in SuiYu railway was established. Through analysis of simulation results, the distribution law of dynamic stress of slab track and subgrade was acquired, and the effect of train speed on the dynamic property of track and soil subgrade was investigated. The research results indicate that along railway cross section, the dynamic stress of track structure is distributed unevenly, while it is more uniform on the surface of subgrade. Meanwhile, the dynamic stress of track and subgrade surface substantially increases linearly with train speed, but the attenuation law of dynamic stress along subgrade depth has little effect by the speed.