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2020 Vol.19, Issue 4 Preview Page

Research Article

Analysis of the Behavior Characteristics of Pile Foundations Responding to Ground Deformation

지반 변형 대응형 말뚝 기초의 거동 특성 분석

Junwon Lee1
,
Sehee Shin2
,
Haklin Lee3
,
Dongwook Kim4
,
Kicheol Lee5†
이 준원1
,
신 세희2
,
이 학린3
,
김 동욱4
,
이 기철5†
1Student Member, Graduate Student, Department of Civil and Environmental Engineering, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Republic of Korea
2Nonmember, Graduate Student, Department of Civil and Environmental Engineering, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Republic of Korea
3Nonmember, Graduate Student, Department of Civil and Environmental Engineering, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Republic of Korea
4Member, Associate professor, Department of Civil and Environmental Engineering, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Republic of Korea
5Member, Graduate Student, Department of University Innovation, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Republic of Korea
*wlq4619@inu.ac.kr
31 December 2020. pp. 21-32
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Abstract

As the global large-scale infrastructure construction market expands, the construction of civil engineering structures in extreme environments such as cold or hot regions is being planned or constructed. Accordingly, the construction of the pile foundation is essential to secure the bearing capacity of the upper structure, but there is a concern about loss of stability and function of the pile foundation due to the possibility of ground deformation in extreme cold and hot regions. Therefore, in this study, a new type of pile foundation is developed to respond with the deformation of the ground, and the ground deformation that can occur in extreme cold and hot region is largely divided into heaving and settlement. The new type of pile foundation is a form in which a cylinder capable of shrinkage and expansion is inserted inside the steel pipe pile, and the effect of the cylinder during the heaving and settlement process was analyzed numerically. As a result of the numerical analysis, the ground heaving caused excessive tensile stress of the pile, and the expansion condition of the cylinder shared the tensile stress acting on the pile and reduced the axial stress acting on the pile. Ground settlement increased the compressive stress of the pile due to the occurrence of negative skin friction. The cylinder must be positioned below the neutral point and behave in shrinkage for optimum efficiency. However, the amount and location of shrinkage and expansion of cylinder must comply with the allowable displacement range of the upper structure. It is judged that the design needs to be considered.

Keywords
Ground deformation
Heaving and Settlement
Cylinder
Shrinkage and expansion
Numerical analysis

세계적으로 대규모 인프라 구조 건설 시장이 확대됨에 따라 극한지 및 극서지와 같은 극한 환경에서의 토목 구조물 시공이 계획 혹은 시공 중에 있다. 이에 따라 구조물의 지지력 확보를 위한 말뚝 기초의 시공이 필수적이나 극한지 및 극서지의 지반 변형 가능성으로 인해 말뚝 기초의 안정성 및 기능 상실이 우려된다. 따라서 본 연구에서는 새로운 형식의 말뚝 기초를 개발함으로써 지반 변형에 대응하고자 하며, 극한지 및 극서지에서 발생 가능한 지반 변형을 크게 융기 및 침하로 구분하였다. 지반 변형 대응형 말뚝은 강관 말뚝 내부에 수축 및 팽창이 가능한 실린더가 삽입된 형태로 융기 및 침하 과정에서 실린더의 거동에 따른 말뚝 영향을 수치해석적으로 분석하였다. 수치해석 결과 지반 융기는 말뚝의 과도한 인장응력을 발생시켰으며, 실린더의 팽창 조건은 말뚝에 작용하는 인장 응력을 분담해 주어 전체적으로 말뚝에 작용하는 축 응력을 감소시켰다. 지반 침하는 부주면 마찰력 발생에 따른 말뚝의 압축응력을 증가시켜 주었는데, 실린더는 중립점 이하에 위치하여 수축 거동 시 최적의 효율을 보여주었다. 하지만 지반 변형 대응형 말뚝 시공 시 수축 및 팽창량은 상부 구조체의 허용 변위 범위를 준수하여야 하며, 설계 시 이에 따른 고려가 필요할 것으로 판단된다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 19
  • No :4
  • Pages :21-32
  • Received Date : 2020-10-19
  • Revised Date : 2020-11-01
  • Accepted Date : 2020-11-04
  • DOI :https://doi.org/10.12814/jkgss.2020.19.4.021
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