基于ABAQUS的旁孔透射法数值分析

Numerical Analysis of Parallel Seismic Tests Based on ABAQUS

研究致力于采用无损检测方法解决既有建筑桩基检测过程中桩长识别以及缺陷段判定的问题。在简要介绍旁孔透射法后,对该方法采用了三维有限元数值分析进行论证,建立了三维完整桩-地基土模型及三维缺陷桩-地基土模型,并施加脉冲荷载进行动力时程分析,得到了桩侧一定距离处旁孔内的压缩波信号,并对压缩波到达时间、幅值、深度、桩长等信息进行了综合分析。结果表明:旁孔透射法能够克服上部结构对桩基检测的影响,方法可靠,值得推广。

This research is devoted to solving the problems of pile length identification and defect section determination in pile foundation detection of existing buildings by non-destructive testing method.After briefly introducing parallel seismic tests,the method is demonstrated by three-dimensional finite element numerical analysis.A three-dimensional complete pile-foundation soil model and a three-dimensional defective pile-foundation soil model are established.The dynamic time-history analysis is carried out by applying impulse load.The compression wave signals in the side-hole at a certain distance on the pile side are obtained,and the compression wave is also analyzed.The arrival time,amplitude,depth,pile length and other information are comprehensively analyzed.The results show that side-hole transmission method can overcome the influence of superstructure on pile foundation detection,and the method is reliable and worth popularizing.