A Prediction Model for Train-Induced Track Vibrations

 

Pham-Ngoc Thach

College of Civil and Transportation Engineering, Hohai University, China
Hochiminh University of Transportation, Vietnam
e-mail: pnt.geo@gmail.com

Gang-Qiang Kong

College of Civil and Transportation Engineering, Hohai University, China
e-mail: gqkong1@163.com

 

 ABSTRACT

A Three-dimensional (3D) prediction model for railway embankments on layered ground is proposed. In which, the Krylov’s load transmission mechanism was first applied to the “moving loads - track” system to determine equivalent forces acting on ballast surface. Then, the finite element method (FEM) is used to analyze the “ballast-embankment-layered ground” system subjected to the equivalent forces. Due to the versatility of the FEM, complexities in topology of the track foundation could be readily handled in the model. The model is verified with an available analytical solution to the problem of a single load moving on a track resting on an elastic half space. An illustrative example of a railway embankment over soft soil that is subjected to a five-carriage train moving at a speed of 60 m/s (216 km/h) is presented to demonstrate capabilities of the model..

Keywords: ground vibration; railway embankment; high-speed train load; numerical simulation

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