Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Dynamic Interaction of Single and Group Piles in Sloping Ground

경사지반에 설치된 단일말뚝과 무리말뚝의 동적 상호작용

  • Tran, Nghiem Xuan (Dept. of Civil and Environmental Eng., Seoul National Univ.) ;
  • Yoo, Byeong-Soo (Dept. of Civil and Environmental Eng., Seoul National Univ.) ;
  • Kim, Sung-Ryul (Dept. of Civil and Environmental Eng., Seoul National Univ.)
  • ;
  • 유병수 (서울대학교 건설환경공학부) ;
  • 김성렬 (서울대학교 건설환경공학부)
  • Received : 2019.10.29
  • Accepted : 2019.11.13
  • Published : 2020.01.31
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Abstract

Dynamic behavior of pile foundation is significantly influenced by the dynamic interaction between soil and pile. Especially, in the sloping ground, the soil-pile interaction becomes very complex due to different resistance according to loading direction, soil residual displacement and so on. In this study, dynamic centrifuge tests were performed on the piles in the sloping ground. The model structures consisted of a single pile and 2×2 group pile. The soil-pile interaction has been investigated considering various conditions such as slope, single and group piles, and amplitude of input motions. The phase differences between soil and pile displacement and dynamic p-y curves were evaluated. The analysis results showed that the pile behavior was largely influenced by the kinematic forces between soil and pile. In addition, the dynamic p-y curve showed the complex hysteresis loop due to the effect of slope, residual displacement, and kinematic forces.

말뚝의 동적거동은 말뚝과 지반 사이의 동적 상호작용에 큰 영향을 받는다. 특히, 경사지반에 설치된 말뚝은 진동방향에 따른 지반저항력 차이, 지반 변위 등에 의해 말뚝-지반 동적상호작용이 매우 복잡해진다. 본 연구에서는 건조 사질토 경사지반에 설치된 단일말뚝과 2×2 무리말뚝에 대하여 동적 원심모형실험을 수행하였다. 그리고, 말뚝과 지반 변위 사이의 위상차 및 동적 p-y 곡선 등을 산정하여 경사지반, 단일말뚝과 무리말뚝, 입력가속도 진폭 등의 조건이 말뚝-지반 동적 상호작용에 미치는 영향을 분석하였다. 그 결과, 지반-말뚝 사이의 운동학적 힘이 말뚝의 동적거동에 큰 영향을 주며, 동적 p-y 곡선이 지반경사, 잔류변위, 운동학적 힘의 영향 등으로 매우 복잡한 형상을 보여주는 것으로 나타났다.

Keywords

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