3D FINITE ELEMENT ANALYSIS OF DYNAMIC RESPONSE OF SUBGRADE AND THE COUNTERMEASURES IN BRIDGE-SUBGRADE TRANSITION SECTION

摘要

With the increase of axle load and train speed, dynamic interaction of train-track system becomes so exacerbated that the deformation and dynamic response of subgrade are more aggravated. The differential settlement will be created in bridge-subgrade transition section under such dynamic action, and an adverse effect on the train operation safety can be caused. Meanwhile, differential settlement will produce additional dynamic effect on the lines when high-speed trains go through the railway lines. Such dynamic action will intensify the deterioration of settlement and accelerate the damage of subgrade. Therefore, a 3D finite-element model was established to systematically study the dynamic response characteristics of subgrade in bridge-subgrade transition section of heavy haul railway under dynamic load. Finite-element method was applied to systematically study the dynamic response characteristics of embankment in bridge-embankment transition section of heavy haul railway under dynamic load. The dynamic response rules are systematically summarized after analysis. The countermeasures are concluded at last.