Journal
OCEAN ENGINEERING
Volume 225, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2021.108828
Keywords
Pipe pile; Distributed low strain test; Parallel seismic test; Dynamic soil-pile interaction; High frequency interference
Funding
- National Natural Science Foundation of China [51878634, 51678547, 51878185]
- Outstanding Youth Project of Natural Science Foundation of Zhejiang Province [LR21E080005]
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
- Fundamental Research Founds for National University, China University of Geosciences (Wuhan) [1910491T04, CUGC09]
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The study introduced a new method called DLSITs for dynamic integrity testing of piles, with improved detection depth and accuracy. Results showed high frequency interference in both DLSITs and PSTs due to the 3D effect of piles, recommending a solution to reduce this interference.
In this study, the authors proposed a new dynamic integrity test method of piles, namely, distributed low strain integrity test (DLSITs). The basic idea of DLSITs is that a series of accelerated sensors connected by cables are preinstalled on the steel reinforcement cage of cast-in-place pile or attached on the shaft of precast piles. Compared with the conventional methods (LSITs), the efficient detection depth of the DLSITs can be doubled and its detection accuracy is significantly improved. Accordingly, a coupled 3D analytical model is established for the theoretical analysis of the DLSITs. The developed theoretical model is also applied to investigate the 3D effect of the parallel seismic test (PSTs). A vibration mode analysis is conducted to clarify the forming mechanism of the high frequency interference during the DLSITs and PSTs. The main findings can be drawn as: Both the DLSITs and PSTs suffer obvious high frequency interference arisen from the 3D effect of piles. To reduce this adverse influence, the radius angle between the impact force location and the axial line of receiving sensors is advised to set as 90 degrees.
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