Geomechanics and Engineering

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Effects of polymer support fluid on shaft resistance of offshore bored piles

  • Chungsik Yoo (School of Civil, Architectural Engineering and Landscape Architecture, Sungkyunkwan University) ;
  • Chun-Won Shin (School of Civil, Architectural Engineering and Landscape Architecture, Sungkyunkwan University)
  • Received : 2021.10.05
  • Accepted : 2023.05.03
  • Published : 2023.06.10
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Abstract

In this paper, we present the results of an experimental study on the effect of polymer support fluid on shaft resistance of offshore bored piles. A series of pullout tests were performed on bored piles installed under various boundary conditions considering different types of grounds and support fluids, and a range of support fluid exposure times. Contrary to previous studies concerning onshore bored piles, a time dependent effect of polymer fluid on shaft resistance was observed in all ground types. The adverse effect of polymer support fluid on the shaft resistance, however, was considerably less than bentonite support fluid for a given exposure time. No significant reduction in shaft resistance was evident when limiting the exposure time of the polymer support fluid to the side wall of the borehole within 2-3 hours. The degree to which the polymer fluid affects shaft resistance seemed to vary with the ground type. A proper consideration should be given to the time dependent effect of polymer fluid on shaft resistance of bored piles installed in offshore construction environment to limit its adverse effect on the pile performance. The practical implications of the findings are discussed.

Keywords

Acknowledgement

This research was supported by the National Research Foundation of Korea (Project Number: NRF-2021R1A2C3011490) and Hyundai Heavy Industries Co., LTD. This financial support is gratefully acknowledged.

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