低应变反射波法测桩的轴对称问题数值计算

低应变反射波法测桩的轴对称问题数值计算 English Version

1.School of Resources and Environmental Engineering Hefei University of Technology Hefei 230009 China 2.Anhui Institute of Building Research and Design Hefei 230001 China

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。
- 动力响应 /
- 有限差分法 /
- 三维效应 /
- 低应变测桩 /
- 三维模型
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.
- dynamic response /
- finite difference method /
- three-dimensional effects /
- low strain integrity testing of pile /
- three-dimensional models