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An Analysis of Dynamic Response of Subgrade to High-speed Moving Traffic Loads with Three Degrees of Freedom

Author: WuYunLi
Tutor: HuAnFeng
School: Zhejiang University
Course: Geotechnical Engineering
Keywords: High-speed train Ballastless Elastic half-space Fourier transform Train speed Loading frequency Vertical displacement Acceleration response
CLC: TU435
Type: Master's thesis
Year: 2010
Downloads: 73
Quote: 1
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Abstract


High-speed train with its efficient, economic and environmental advantages of other operators around the world have been widely used. With high-speed trains in each country built and put into operation, the load caused by high-speed motion in orbit and ground wave propagation problems in also caused widespread concern. Train speed increases, high-speed motion train loads in orbit and ground to produce a great shock and vibration, the vibration of the trains caused by ground vibration mechanism and has become one of the focus. Firstly, with urban development has brought changes in the traffic situation and resulting vibration problems, elaborated study of ground vibration caused by rail traffic necessity summarizes the main contents of the problem and research methods, and abroad in this a field of research for a more comprehensive overview. And separately from the vehicle dynamics, rail engineering, roadbed construction and other aspects of domestic and foreign research and basic concepts for a detailed overview. Then, combined with high-speed railway vehicle systems - ballasted / No ballasted track - foundation structural characteristics considered after three degree of freedom system bogie of the train load model, built a two vehicle suspension system - ballasted track / No ballasted track - foundation vertical coupling dynamic analysis model. According to the basic equations of elastic dynamics, using the Fourier integral transform, in the space coordinates of the three degree of freedom system derived pushdown train loads on ballasted track - elastic half-space, non-ballasted track - two kinds of elastic half-space model of the foundation soil When ground surface vertical displacement, acceleration expressions. On this basis, according to this analysis theory, Mathematica7.0 the computer program, combined with examples of the three degree of freedom system trains moving axis loading induced vibration characteristics of the foundation soil were calculated and analyzed. More systematic analysis of the vibration source train loads of ground vibration characteristics and influencing factors, the effect of different vehicle models and different orbital model for the dynamic response of the surface, and also studied the propagation distance, the train speed and other parameters on the foundation soil surface vibration. Since the surface is a measure of the train dynamic response dynamic load effects on an important indicator of adjacent buildings, so the theoretical analysis of high-speed rail transportation forecasting environmental vibration assessment has important theoretical significance and practical reference value, but also for non-ballasted track rail system dynamics Learn optimized to provide a reference, but also for further research work related basis.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Soil Mechanics > Soil Dynamics and Vibration foundation
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