PARAMETRIC STUDY ON EMBANKMENT-GROUND VIBRATIONS GENERATED BY TRAIN MOVING LOADS

In order to predict and evaluate track and embankment vibrations generated by train moving load and wave propagation in adjoining ground,a coupled dynamic interaction model for track and underlying ground under moving loads was developed by employing the 2.5D finite element method,and dynamic responses of three-dimensional ground were obtained. Multi-wheel axle train loadings were considered to study the track and ground vibrations both for low-speed and high-speed cases;and computation results were illustrated to show the ground response characteristics. Extensive parametric studies were performed to assess influences of several controlling parameters,including track stiffness,embankment height,shear wave velocity and damping ratio of underlying ground soil,train speed and its vibration frequency. The analytical results obtained in the current study are important to analyze the running stability of high-speed train on soft soil ground and to evaluate its vibration impact to adjoining ground along raillines.