In view of the problem that the dynamic effect of vehicle load on the supporting structure is not taken into account when calculating the active soil pressure behind the pile in the existing design code,a formula for calculating the active soil pressure under the vehicle load is derived based on the assumption of plane sliding surface,combined with the pseudo-dynamic analysis method and considering the effect of the inertial force on the soil mass behind the pile under the vehicle dynamic load.The resultant force of active earth pressure is divided into a dynamic earth pressure component and a static earth pressure component.The influence of soil weight and external friction angle of pile-soil on the resultant force of active earth pressure is analyzed,and the influence of horizontal vibration acceleration coefficient,internal friction angle,driving speed and distance between piles on dynamic earth pressure is analyzed,and compared with the active earth pressure distribution law under different cohesive force.The research results show that the dynamic earth pressure behind piles is non-linear distribution;during a period of vibration,the resultant force of the active soil pressure behind the pile increases first and then decreases with the increase of the dip angle of the sliding surface and the duration of time;the dynamic pressure amplitude decreases with the increase of pile spacing,and the vibration period increases with the increase of vehicle speed.
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