Study on defect detection of extended pile shaft under lateral low-strain integrity test

被引：1
|
作者：
Zhao S. [1 ,2 ]
Wu J.-T. [1 ,2 ]
Qiu X.-C. [1 ,2 ]
Wang K.-H. [1 ,2 ]
Tu Y. [1 ,2 ]
机构：
[1] Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou
[2] Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2021年 / 55卷 / 10期
关键词：
Defect detection; Extended pile shaft; Lateral vibration; Low-strain;
D O I：
10.3785/j.issn.1008-973X.2021.10.008
中图分类号：
学科分类号：
摘要：
The lateral velocity response of an extended pile shaft with defects of various sizes in the buried section was analyzed through model experiment, and the results were analyzed by combining with finite element analysis (FEA) results. Results show that the low-strain integrity test based on the lateral vibration characteristics of the pile can be used to distinguish the defects on extended pile shaft. The smaller the cross-sectional diameter of the defect is, the more obvious the reflection of the defect on the lateral velocity response of the pile is. As the height of the defect changes, the reflection of the top and bottom of the defect may superpose or separate, reflecting waveforms of the defect under different defect heights are inconsistent. The FEA results accorded well with the experimental results when adopting the shear flexible beam element of FEA to simulate the extended pile shaft. It is recommended that the excitation and receiving positions are both near the cap when conducting low-strain integrity test based on the lateral vibration characteristics of the pile. The depth of the defect can be inferred from the arrival time of the reflection of the defect in practical engineering. © 2021, Zhejiang University Press. All right reserved.
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页码：1867 / 1876and1902
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