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2022 Vol.38, Issue 4 Preview Page

Research Article

Performance Evaluation of Pull-out Load of a New Type of Double-wall Pile Foundation for Easy Demolition

기초구조물 회수가 용이한 신형식 이중벽 말뚝기초의 인발하중 성능평가

Jae-Hyun Kim1
,
Jeong-Soo Kim2
,
Minjy Lee3
,
Sen Sven Falcon3
,
Yun Wook Choo4
,
Sung-Pil Hwang5*
김 재현1
,
김 정수2
,
이 민지3
,
Falcon Sen Sven3
,
추 연욱4
,
황 성필5*
1Member, Assistant Prof., Dept. of Civil Engrg., The College of Art, Culture and Engrg., Kangwon National Univ.
2Member, Research Specialist, Dept. of Future & Smart Construction Research, Korea Institute of Civil Engrg. and Building Technology
3Member, Graduate Student, Dept. of Civil and Environmental Engrg., Kongju National Univ.
4Member, Prof., Dept. of Civil and Environmental Engrg., Kongju National Univ.
5Member, Senior Researcher, Dept. of Geotechnical Research, Korea Institute of Civil Engrg. and Building Technology
1정회원, 강원대학교 문화예술·공과대학 건축토목환경공학부 토목공학전공 조교수
2정회원, 한국건설기술연구원 미래스마트건설연구본부 전임연구원
3정회원, 공주대학교 건설환경공학과 박사과정
4정회원, 공주대학교 건설환경공학과 교수
5정회원, 한국건설기술연구원 지반연구본부 수석연구원
*Corresponding Author
30 April 2022. pp. 21-32
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Abstract

Steel pile foundations are widely used for offshore constructions due to their high bearing capacity and efficiency. Typically, offshore structures that have reached the end of their design life are required to be demolished. However, pile foundations are often left on site due to technical and economic limitations. The pile left on the site not only pollutes the environment, but can also cause obstacles for the construction of new structures. Therefore, research is required to completely eliminate these foundations at the site. In this study, a new type of double-wall pile foundation that can drastically reduce the pull-out load was conceptually proposed, and a series of model tests were performed to validate the performance of the double-wall pile foundation. The installation and extraction of the double-wall pile were simulated in dry sand in the model test, and the measured up-lift load was compared to that of the conventional pile. According to the result, the maximum up-lift load induced by the decommissioning of the double-wall pile was reduced by 45% when compared to the traditional pile in dense sand. This study verified the mechanism for reducing the up-lift load of the double-wall foundation and confirmed the possibility of completely decommissioning a pile that has reached the end of its nominal service life.

Keywords
Decommissioning
Double-wall pile foundation
Offshore structures
Pile foundation
Pull-out

강재형 말뚝기초는 안정적인 지지력 확보와 높은 시공성으로 해양구조물 기초로 널리 활용되고 있다. 일반적으로 설계수명에 도달한 해양구조물은 해체수순을 밟게 되는데 말뚝기초는 높은 인발하중과 경제적인 이유로 예외적으로 현장에 존치되는 경우가 많다. 현장에 존치된 기초는 환경오염뿐만 아니라 신규구조물을 건설하는데 장애요인이 될 수 있으므로 말뚝기초 완전해체를 위한 연구가 필요한 실정이다. 본 연구에서는 인발하중을 획기적으로 저감시킬 수 있는 신형식 이중벽 말뚝기초를 제안하고 축소모형실험을 통해 인발하중 저감성능을 실험적으로 평가하였다. 이를 위해 축소된 이중벽 말뚝기초를 제작하고 건조된 모래지반에서 말뚝 설치 및 인발 거동을 모사하였으며, 측정된 인발하중을 동등한 단면의 일반말뚝과 비교하였다. 그 결과, 조밀한 모래지반에서 이중벽 말뚝의 최대 인발력이 일반말뚝에 비해 45% 감소되는 것을 확인하였다. 본 연구를 통해 이중벽 말뚝의 인발하중 저감 성능과 메커니즘을 검증하였으며, 설계수명에 도달한 기초를 완전히 회수할 수 있는 가능성을 확인하였다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 38
  • No :4
  • Pages :21-32
  • Received Date : 2022-02-04
  • Revised Date : 2022-02-21
  • Accepted Date : 2022-02-27
  • DOI :https://doi.org/10.7843/kgs.2022.38.4.21
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