Vibration Characteristics of Pile-net Composite Foundation under Seismic and High-speed Train Combined Loads
To investigate the characteristics of ground vibration induced by seismic and high-speed train combined loads,a three-dimensional finite element model including track,subgrade and pile-net composite foundation were established.This model was verified by comparing its results with the measured results and theoretical solution.The acceleration and displacement of ground vibration under different train speeds were compared,and the effect of pile elastic modulus on ground vibration was analyzed.Results show that under the train and Hollister seismic combined load,the displacement of ground vibration at 1 m away from track center is dominated by seismic load,while the acceleration at the same position is dominated by train load.The low frequency ground vibration below 20 Hz is induced by the combined loads,while the high frequency vibration is dominated by train load.Comparing with the train load alone,both the peak value of displacement and acceleration of ground vibration in pile-net composite foundation are larger under the combined Lytle Creek seismic and train loads.Increasing pile modulus can reduce the ground vibration of pile-net composite foundation under both train load and the combined load,while the benefit of pile-reinforcement on vibration reduction under combined load is weaker.
vibration and waveseismic loadhigh-speed train loadpile-net composite foundationpile modulusground vibration
万方数据
维普
