Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Foundation-soil-foundation Interaction of Shallow Foundations Using Geo Centrifuge: Experimental Approach

원심모형실험을 이용한 얕은 기초의 기초-지반-기초 상호작용: 실험적 접근

  • Ngo, Linh Van (Dept. of Civil and Environmental Engrg., Chonnam National Univ.) ;
  • Kim, Jae-Min (Dept. of Marine and Civil Engrg., Chonnam National Univ.) ;
  • Lim, Jaesung (Dept. of Civil and Environmental Engrg., Chonnam National Univ.) ;
  • Lee, Changho (Dept. of Marine and Civil Engrg., Chonnam National Univ.)
  • 노린반 (전남대학교 해양토목공학과) ;
  • 김재민 (전남대학교 해양토목공학과) ;
  • 임재성 (전남대학교 해양토목공학과) ;
  • 이창호 (전남대학교 해양토목공학과)
  • Received : 2017.11.15
  • Accepted : 2017.12.19
  • Published : 2018.01.31
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Abstract

Geocentrifuge tests are performed to investigate the structure-soil-structure interaction of shallow foundations that have various sizes. The soil specimen is prepared by using the air-pluviation, and the dynamic responses of the foundation are monitored with separation distances between the two foundations and the embedment. During the centrifugal test, the measured ground acceleration shows a tendency to increase with the increase of the input seismic amplitude, and maximum acceleration is measured at the surface due to the ground amplification. As the separation distance between the two foundations decreases, the ratio of the response spectral acceleration (RRS) increases and the period at the peak RRS decreases due to the structure-soil-structure interaction (SSSI). The RRS of the two foundations tends to decrease when the foundations are buried in the ground at the same separation distance.

구조물-지반-구조물 상호작용을 확인하기 위하여 다양한 크기를 가지는 얕은 기초에 대하여 원심모형실험에 의한 진동대실험을 실시하고 결과를 분석하였다. 낙사법을 이용하여 지반을 조성하였으며, 두 기초의 이격 거리 및 매립에 따른 거동을 평가하였다. 원심모형실험 시 측정된 깊이별 지반 가속도는 입력 지진파의 크기가 증가함에 따라 증가하는 경향을 보였으며, 증폭 현상에 의하여 지표면에서 가장 큰 값을 보였다. 두 기초의 이격 거리가 줄어듦에 따라 구조물-지반-구조물 상호작용에 의하여 가속도 응답 스펙트럼 비(RRS)의 크기는 커지며, RRS 값이 최대가 되는 주기는 줄어 들었다. 동일한 이격 거리에서 기초가 지반에 매립될 경우, 두 기초의 RRS는 감소하는 경향을 보였다.

Keywords

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