完整桩瞬态纵向振动的参数影响分析

基于完整桩瞬态纵向振动模型的数值分析,表明土参数、桩参数和激振力参数都对桩的动力响应发生影响.对未入土的桩,桩顶振速曲线上反射与入射幅值比为2;对土中的桩,若桩周土剪切模量、桩长、激振力作用时间增加,或桩径和桩弹性模量减小,都使得这个比值减小;当桩底土剪切模量与桩弹性模量之比小于0.01时,桩底反射与入射同相位,当这个比大于0.1时,桩底反射与入射反相位.

Analysis of influence of dynamic model parameters of an integrate pile on its transient longitudinal vibration

Based on the numerical analysis of transient longitudinal vibration model of an integrate pile,it is found that parameters of soil,pile and impact force have effects on dynamic response of the pile.When the pile is free, the ratio of incident wave maximum value to reflection wave maximum value is two.When the pile is in the ground, the ratio decreases with the increase in the shear modulus of soil around the pile, the pile length and the impact time,and the ratio increases with the increase in the diameter and elastic modulus of the pile. The phases of incident wave and reflection wave are the same or opposite when the ratio of the shear modulus of soil under the pile toe to the elastic modulus of the pile is less than 0.01 or more than 0.10.