A 3D DYNAMIC TRAIN-TRACK INTERACTION MODEL TO STUDY TRACK PERFORMANCE UNDER TRAINS RUNNING AT CRITICAL SPEED

Open Access
Author:
Gao, Yin
Graduate Program:
Civil Engineering
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
July 10, 2013
Committee Members:
  • Shelley Marie Stoffels, Thesis Advisor
Keywords:
  • High speed rail
  • critical speed
  • train-track interaction model
Abstract:
In this thesis, the ground-borne vibrations generated by high-speed trains are investigated, by implementing a three-dimensional dynamic train-track interaction model. Previous research has shown that high speed trains on soft ground can induce a significant increase in vibration level when the trains move at a “critical speed.” The critical speed is explained as that at which resonance occurs between the moving train and the Rayleigh wave of the subgrade soil. Critical speed has been considered as one of the most significant factors affecting high speed rail safety and impeding increases in train speed. In this research, a 3D dynamic track model is introduced to determine the ground response generated by high-speed trains. It is based on a sophisticated train model, a theoretical model for the track and layered subgrade soil. In order to investigate the performance of this model, sensitivity analysis is conducted to explore the influence of each parameter. Simulation by commercial finite element software (ABAQUS) is also used for separate verification of the model. After model verification, the effects of critical speed on ground-borne vibrations are further discussed.