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Qiu Yan-jun, Zhang Xiao-jing, Wei Yong-xing. Influenced of train speed on dynamic characteristics of ballastless track subgrade[J]. Journal of Traffic and Transportation Engineering, 2007, 7(2): 1-5.
Citation: Qiu Yan-jun, Zhang Xiao-jing, Wei Yong-xing. Influenced of train speed on dynamic characteristics of ballastless track subgrade[J]. Journal of Traffic and Transportation Engineering, 2007, 7(2): 1-5.
shu

Influenced of train speed on dynamic characteristics of ballastless track subgrade

  • 1.

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 2.

    The Second Survey and Design Institute of China Railways, Chengdu 610031, Sichuan, China

More Information
  • Author Bio:

    Qiu Yan-jun(1966-), male, PhD, professor, +86-28-87600340, publicqiu@vip.63.com

  • Received Date: 2006-12-12
  • Publish Date: 2007-04-25
    Abstract
  • In order to analyze the influence of train speed on the dynamic characteristics of ballastless track subgrade, a 3-D layer finite element model of the subgrade was establisbed by using layer system theory and finite element method, the different speed influences of train load on the vertical acceleration, vertical displacement, dynamic stress and its transverse distribution characteristics of the subgrade surface layer were considered, and the mechanical behaviors of the subgrade under train load were studied.It is observed that the vertical acceleration is obviously affected by train load speed, and the acceleration increases with train load speed raising; the dynamic displacement is little influenced by train load speed, and its change value is less than 0.05 mm when the speed increased by 20 km·h-1; the dynamic stress presents a fluctuate trend with train load speed increasing.The result is similar to actual measure result, and approves the correctness of the model.

     

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