双速度法在承台桩系统中的完整性检测研究

A Study on Platform-pile System by Using Two Velocity Measurement

为了更加深入地研究双速度法在承台-桩系统的应用,建立了承台-桩系统的三维计算模型。利用交错网格有限差分法求解三维波动方程,得到了承台-桩系统的不同接收点的动力响应。分析了完整桩与缺陷桩的双速度曲线。结果表明:采用双速度法可以较为准确地确定桩身波速,进而确定桩长;还能够较为准确地确定桩身缺陷的存在。

In order to study double signal method in platform-pile system, the three-dimensional computation model of platform-pile system is established. Based on staggered grid finite difference method,the three-dimensional elastic wave equations are solved and the dynamic responses of platform-pile system are obtained. The curves of double signal of integrate and necking pile are studied. The results show the P wave velocity of pile is got accurately by suing double signal method, and then the pile length is determined. The defect of pile also can be accurately determined.