【摘要】 建立了更符合工程实际的桩土系统瞬态振动计算模型。利用有限差分法计算了完整桩在瞬态轴向激振力作用下的动力响应,比较分析了三维和一维桩顶轴向速度响应的差别。结果表明:相对激振半径、桩周土剪切波速也是影响三维效应的重要因素;传感器放在0.55R(R是桩的半径)处可以得到干扰较小的信号。绘制了不同时刻的波场图,直观地反映了波在桩中的传播规律。更多还原

【Abstract】 A computing model for the transient vibration of soil-pile system was presented.The dynamic response of an intact pile impacted by transient axial impulse was computed by use of the finite difference method,and the difference between 3D(axisymmetric) and 1D axial velocity responses at the pile top was compared and analyzed.It was shown that the 3D effect was also related to the ratio of hammer radius to pile radius and shear velocity of the soil around the pile.The best position of receiver is 0.55R(R was pile radius) from the pile center.The wave snapshots at different time,which gave a visual interpretation of propagation of wave in the pile,were obtained.更多还原