预应力管桩反射波法的三维波场分析  

Application of reflected wave method to 3-D wave field analysis of prestressed pipe piles

作　　者：陶俊[1] 刘东甲[1] 柯宅邦[2] 卢志堂[3] 刘华瑄 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]安徽省建筑科学研究设计院,安徽合肥230001 [3]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《合肥工业大学学报（自然科学版）》2015年第2期226-231,共6页Journal of Hefei University of Technology：Natural Science

基　　金：住房和城乡建设部科技计划资助项目(2010-K3-23);广东省公路管理局科技资助项目(粤公研2011-21)

摘　　要：文章建立了管桩的三维动力学模型,运用柱坐标下的弹性波动方程求解自由管桩的动力响应;利用交错网格有限差分法编制相应程序,通过数值计算得到桩身各点在不同时刻的振动速度;探讨了完整桩在竖向激振力作用下的瞬态动力响应,绘制管桩低应变动测的三维波场图;研究管桩的三维干扰效应,阐明了应力波在管桩中的传播理论,直观地显示管桩中除纵波外还存在横波和面波。模型桩实验实测曲线上的信号均能与数值模拟所得波场图一一对应,说明了数值模拟的正确性。文中还比较了不同纵向线上各点的干扰情况,直观地验证了90°为较理想的传感器安装点。Three-dimensional dynamics model of pipe pile is established, and the elastic wave equations under cylindrical coordinate system are used to solve the dynamic responses of free pipe piles. The staggered grid finite difference method is used to prepare the corresponding procedures, and the nu- merical calculation is carried out to obtain the vibration velocity of pile points at different moments. The transient dynamic responses of a pipe pile subjected to transient vertical loading are discussed. The three-dimensional wave snapshots of low strain dynamic testing of pipe piles are drawn, and the three-dimensional interference effects of pipe piles are studied, so as to expound the transmitting theo- ry of the stress wave in the pipe pile. It is shown visually that the shear wave and surface wave exist in the pipe pile besides the longitudinal wave. According to the model pile testing, the signal on the measured curve can one-to-one correspond with the wave snapshot obtained by the numerical simulation, thus proving the correctness of the numerical simulation in this paper. The interference of each point along different vertical lines is compared, and it is verified visually that the installation point of 90° which is the central angle of click vibration point and pick-up point for sensor is better.

关 键 词：管桩 反射波法 有限差分法 三维波场 

分 类 号：TU473.16[建筑科学—结构工程]