Experimental Study on Vibration Velocity of Piled Raft Supported Embankment and Foundation for Ballastless High Speed Railway

In recent years, the high development of high-speed railway lines cross through areas with poor geological conditions, such as soft soil, offshore and low-lying marsh areas, resulting geotechnical problems, large settlements reduction bearing capacity. As a new soil reinforcement method in speed lines, piled raft structure has been used to improve conditions control excess settlement. order study dynamic behavior supported ballastless track system an experimental on vibration velocities embankment foundations is presented different underground water levels. Vibration at specified positions are obtained discussed. The velocity curves various testing locations clearly visible have sharp impulse relaxation pattern, corresponding loading from train wheels, bogies, passages. distribution horizontal direction three speeds follows exponential curves. Most power spectrums mainly concentrated harmonic frequencies. change level slight impaction peak spectrum induced by loads transmitted, absorbed, weakened certain extent structure. response character embankments affected their self-vibration characteristics capacity