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.
关键词
振动与波/地震荷载/高铁荷载/桩网复合地基/桩体模量/地面振动
Key words
vibration and wave/seismic load/high-speed train load/pile-net composite foundation/pile modulus/ground vibration
维普
万方数据