Three Dimensional Finite Element Simulation of High Speed Train Induced Ground Vibration

摘要

As a safer and faster means of transportation, the high speed railway grows rapidly around the world.However, the vibration and noise induced by high speed train draw more and more attention and cannot be neglected.This paper is concerned simulation of ground vibrations induced by High Speed Trains with three different models, formulated in the time domain using the finite element method (FEM).In common, the slab,concrete-asphalt (CA) mortar, concrete base and subgrade are modelled using 8 nodes solid cubic elements.The rail is modelled using Euler-Bernoulli beam element.Absorbing boundaries are used to prevent wave reflections from the edge of the model.And Rayleigh damping approach is also used.Three dimensional models which can take the variation in the train direction into account have been proved to be better in ground vibration simulations.For comparison, model one and two consider the train as a moving constant load and a moving mass, respectively; and the wheel rail interaction is fully included in model three with a 1/4 train.The result is verified with previous researches.Detailed comparison between the three models and some useful recommendations are proposed to improve the accuracy and efficiency of ground vibration simulation.