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2023 Vol.22, Issue 3 Preview Page

Research Article

Characteristics of the Lateral Resistance of Pile according to the Lateral Loading Rate in Dense Sand

조밀한 모래지반에서 수평재하속도에 따른 말뚝의 수평저항 특성

Gichun Kang1
,
Hyejeong Park2
,
Seong-kyu Yun3
,
Jiseong Kim4*
강 기천1
,
박 혜정2
,
윤 성규3
,
김 지성4*
1Non-Member, Associate Professor, Department of Civil Engineering, College of Engineering, Gyeongsang National University, 501 Jinjudae-ro, Jinju, Gyeongsangnam-do 52828, Republic of Korea
2Non-Member, Graduate Student, Department of Civil Engineering, College of Engineering, Gyeongsang National University, 501 Jinjudae-Ro, Jinju, Gyeongsangnam-do 52828, Republic of Korea
3Member, Senior Researcher, Engineering Research Institute, Gyeongsang National University, 501 Jinjudae-ro, Jinju, Gyeongsangnam-do 52828, Republic of Korea
4Member, Assistant Professor, Department of Cadastre & Civil Engineering, Vision College of Jeonju, 235 Cheonjam-ro, Wansan-gu, Jeonju, Jeollabuk-do 55069, Republic of Korea
*Corresponding Author
30 September 2023. pp. 97-103
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Abstract

Recently, research on the lateral resistance of pile foundations has been actively conducted. In experimental studies on the lateral resistance of pile foundations, displacement control or load control methods are used. However, in the case of the displacement control method, the lateral resistance of the pile varies depending on the rate of the load applied to the pile. Therefore, this study seeks to determine the change in lateral resistance of pile foundations according to lateral loading rate through model experiments. The experimental results showed that the lateral resistance of the pile tended to decrease as the lateral loading rate applied to the pile head increased. In order to confirm this, a model experiment of the side change of the ground and pile according to the loading rate was additionally conducted. Through inverse analysis, the change in the depth of the rotation point according to the lateral loading rate was identified. Through the change in the lateral resistance of the pile foundation and the depth of the rotating point according to the lateral loading rate, it was proposed to test the loading rate within 1.5 mm/min during the lateral loading test of the pile.

Keywords
Lateral loading rate
Lateral resistance
Depth of the rotation point

최근 말뚝기초의 수평저항력에 대한 연구들이 활발히 이루어지고 있다. 말뚝기초의 수평저항력에 대한 실험연구들의 경우 변위제어법 또는 하중제어법을 사용하고 있다. 하지만 변위제어법의 경우 말뚝에 가해지는 하중의 속도에 따라 말뚝의 수평저항력이 달라진다. 따라서 본 연구에서는 모형실험을 통해 수평재하속도에 따른 말뚝기초의 수평저항력 변화를 파악하고자 한다. 실험결과 말뚝두부에 가해지낸 수평재하속도가 빠를수록 말뚝의 수평저항력이 감소하는 경향을 보였다. 이를 확인하기 위해 재하속도에 따른 지반과 말뚝의 측면변경 모형실험을 추가적으로 진행하였으며, 그 결과 재하속도가 빠를수록 말뚝의 회전절점의 깊이가 감소하였다. 역해석을 통해 수평재하 속도에 따른 회전절점의 깊이 변화를 파악하였다. 수평재하속도에 따른 말뚝기초의 수평저항력과 회전절점의 깊이 변화를 통해, 말뚝의 수평재하시험시 재하속도는 1.5mm/min 이내로 시험하는 것을 제안하였다.

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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 : 22
  • No :3
  • Pages :97-103
  • Received Date : 2023-06-23
  • Revised Date : 2023-09-18
  • Accepted Date : 2023-09-19
  • DOI :https://doi.org/10.12814/jkgss.2023.22.3.097
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