Abstract：Research purposes：The research on the theory and applications of high-speed vehicle-track-subgrade coupling dynamics has mostly focused on the wheel-rail relationship at home and abroad,many achievements about bridge-subgrade transition section have been obtained by using the field tests.However,few achievements on the dynamic response for subgrade transition zone of ballastless have been gotten.To provide the theoretical value and practical significance in high speed railway construction,a reliable vehicle-track-subgrade coupling model,which considers the main influence factors such as vehicle,track and subgrade together,has been established combining with Wuhan-Guangzhou line transition zone in this paper.
Research conclusions：(1)The calculation results is in good agreement with the transition structure dynamic response curve by comparative analysis of test data.(2)The length of high speed railway transition section should be controlled about 40 m,which can effectively reduce or even eliminate the dynamic response of structure layer of the transition section, and can guarantee the high-speed train running safety and comfort.(3)Dynamic response characteristics of dynamic stress,vibration acceleration and dynamic displacement are obviously different between among transition section structure layers,which is mainly marked by the difference on the magnitude of the peak and the peak position.Through the transition section,the dynamic response induced by the train will be significantly reduced to ordinary subgrade dynamic response value. (4)The dynamic response of the transition structure layer affected by vehicle velocity,train axle load size and other factors,is usually increased with the increase of vehicle speed and axle load,among which the train axle load is remarkable influence on dynamic response.(5)The conclusions of this paper can provide reference for design and construction of high speed railway transition section.
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2014, Vol. 31 
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