沿桩顶径向的动测三维效应分析

Analysis of 3D dynamic effect along radius of pile

基于应力波理论,考虑计算精度和效能,借助新型有限元分析系统COMSOL Multiphysics,对基桩动测过程进行了一维和三维动态仿真,对比分析2种模型计算结果的异同,沿桩顶径向三维效应主要表现为不同部位速度响应不同且信号发生振荡,入射波存在延时,反射波到时也存在差别.结合野外实验,较系统地研究了这些三维效应随锤桩比、波长桩径比、长径比的变化规律,给出了三维效应的动测规避方式.

Results of low strain integrity testing of piles are normally interpreted using one-dimensional stress wave theory. While 1D stress wave theory is acceptable for pile-driving analysis, it may not adequately simulate the response of piles integrity tests when the hammer and the incident wave length are small in relation to the diameter of the pile. Extensive parametric studies are performed using 1D and 3D (axisymmetric) wave equation models. Considering calculation precision and efficiency, the axial symmet...