Failure Case Study of Offshore Battered Drilled Shafts Due to Seabed Rock Scouring

Sangseom Jeong, Dohyun Kim, Kiseok Kwak

Research output: Contribution to journalConference article

Abstract

The influence of lateral loads in the offshore environment, such as tides and waves, reduces the stability of the piles under construction and during operation. Scour of the seabed caused by the flow around bridge piers also has a strong influence on the stability and the integrity of offshore structures. In this paper, a comprehensive case study on the offshore bridge piers is highlighted. Special attention was given to the investigation of the collapse of three bridge piers during construction caused by extreme lateral load and seabed scour. To obtain detailed information, an intensive study was carried out to analyze the effect of scour on the stability of battered piles during construction, as well as under in-use conditions. An empirical analysis using HEC-18 (hydraulic engineering circular no. 18, FHWA, 2012) for estimating rock scour was performed along with the results from a multi sonar field test, to accurately estimate the scour depth of the seabed. Through empirical analysis, field test, and numerical analysis, it is shown that the seabed rock scour combined with the relatively short embedded length of piles had critical influence on the stability of these offshore pile foundations.

Original languageEnglish
Pages (from-to)160-172
Number of pages13
JournalGeotechnical Special Publication
Volume2018-March
Issue numberGSP 299
DOIs
Publication statusPublished - 2018 Jan 1
Event3rd International Foundation Congress and Equipment Expo 2018: Innovations in Geotechnical Engineering - Honoring Jean-Louis Briaud, IFCEE 2018 - Orlando, United States
Duration: 2018 Mar 52018 Mar 10

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All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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