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| The Characteristics Analysis of Dynamic Irregularity at Transition Zones of Ballasted Track and Ballsastless Track |
| LI Cheng - hui，QI Wei，GENG Hao, LIU Yu - tao |
| (MOE Key Laboratory of High - speed Railway Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031， China) |
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Abstract Abstract ： Research purposes ： At present，when designing the track stiffnes at tlie transition zones of baiasted track and baisastless track，only the convenience of construction has been considered. There are still many diseases of railway line caused by the dynamic irregularity of railway line. In order to solve these diseases，we need to study the characteristics of dynamic irregularity at transition zones of ballasted track and ballsastless track. Based on this， it can develop a reasonable transition schemes to achieve the purpose of reducing line maintenance and improving the safety and comfort to the passengers. Research conclusions ： From the evaluation indexes of dynamic irregularity linear type，rail deflection rate，rail vibration acceleration，wheel/rail force，the conclusions are obtained as follows： (1) The problems of excessive wheel rail force and bad smooth lines still exist at the transition zones of ballasted track and ballsastless track. (2) Favorable design of track stiffness at the transition section can significantly improve the transition effect. The analysis results showthat the most suitable design is linear transition，and the transition effect is very good when the quantity of transition segments is no less than 5. The setting length of transition zones should be 20 ?30m，and particular length of specific transition zones should be according to the driving speed. (3) The reasonable design of rail stiffness at the transition zones of ballasted track and ballsastless track can effectively reduce the diseases in high speed and heavy load line，which also can provide references for otlier transition zones.
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Received: 05 January 2017
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2017, Vol. 34 
