Mechanical Characteristics Research Of Unballast Track On The Subgrade

With the developing of Chinese railway industry, unballast track on the soil subgrade is used more and more widely, and the structure of unballast track on the soil subgrade is strictly required for the displacement and settlement. For example, the passenger line between Beijing and Tianjin, using the CFG piles to enhance the subgrade in order to improve the stiffness of subgrade and decrease the settlement, in order to guarantee the flat of track structure and the velocity of the railway. This paper is mainly research on the mechanical properties of unballast track slab under the single load, change the stiffness of the fastening and thickness of slab,and comparation between foundation with CFG piles and without CFG piles.The main contents and results of research as follows:(1) Based on the finite analysis software ANSYS, create the rail-track-subgrade continuous model, take account the subgrade as ideal Drucker-Prager elastic& plastic model.(2) Taking account to different load conditions and APDL language, make static and moving load calculation, analysis the change of mechanical properties of track slab and dynamic response.(3) Change the stiffness of the fastening and thickness of slab, analyze the mechanical properties.(4) Analysis the mechanical properties of slab track caused by the piles and without piles.