Vibration characteristics of pile-net composite subgrade under the combined action of earthquake and high-speed train loads
This study examines the vibration characteristics of pile-net composite subgrade under earthquake and high-speed train loads.Using ABAQUS software,a three-dimensional finite ele-ment model involving rail,embankment,and pile-net composite subgrade under earthquake and high-speed train loads was established.The influences of seismic types and train speeds on the vi-bration acceleration and displacement of pile-net composite subgrade were discussed,and sugges-tions for train operation under different seismic loads were proposed.The results show that the ground vibration acceleration of pile-net composite subgrade is controlled by the Hollister earth-quake and high-speed train loading.The vibration displacement is mainly controlled by the Hol-lister earthquake,which means the train speed has little effect on the ground displacement.Under the joint action of the Chi-Chi earthquake and high-speed train loading,the ground acceleration is mainly controlled by the high-speed train loading,while the ground displacement is controlled by the two dynamic loads.This suggests that when an earthquake occurs,the ground displacement can be effectively reduced by slowing down the speed until it reaches zero.Under the joint action of the Lytle Creek earthquake and high-speed train loading,the ground acceleration is mainly controlled by the high-speed train loading,and the ground displacement is controlled by the two loads,particularly the high-speed train loading.When an earthquake like the Lytle Creek earth-quake occurs,the ground vibration displacement can be effectively reduced by slowing down the train speed,thus reducing the possibility of train derailment.
万方数据
维普
