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Undrained Characteristics of Geogrid-Encased Stone Column under Cyclic Load Using Reduced-Scale Model Tests

축소모형실험에 의한 반복하중 작용시 지오그리드 감쌈 쇄석말뚝의 비배수 거동 특성

Jin-Wook Choi1
,
Dae-Young Lee2
,
Chung-Sik Yoo3*
최 진욱1
,
이 대영2
,
유 충식3*
1Student Member, Graduate Student, Dept of Mega Building and Bridge, Sungkyunkwan Univ.
2Senior Researcher, Geotechnical Engrg Division, KICT
3Professor, Dept. of Civil Engrg, Sungkyunkwan Univ.
1성균관대학교 초고층장대교량학과 석사과정
2한국건설기술연구원 지반공학연구실 수석연구원
3성균관대학교 사회환경시스템공학과 교수
*교신저자. *Corresponding Author. 
31 January 2013. pp. 109-120
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Abstract

This paper presents the results of a laboratory investigation into a study on undrained characteristics of a geogrid-encased stone column (GESC) installed in soft clay under cyclic load. In order to analyze behavior of settlement, pore water pressure, stress concentration ratio and strain of the GESC compared to a stone column, a series of reduced-scale laboratory tests were performed. The model tests show that GESC provides a simple and effective method of deformation resistance and settlement restraint when a short-term cyclic load is applied. The maximum strain of geogrid occurred at 1.2D and 1.5D from the top of the column. This paper highlights the importance of considering overlay effect and replacement ratio on cyclic load supporting GESC.

Keywords
Geogrid-encased
Stone column
Reduced-scale laboratory tests
Overlay effect
Replacement ratio

본 논문에서는 반복하중 작용시 연약지반에 설치된 토목섬유 감쌈 쇄석말뚝의 비배수거동특성을 다루었다. 모형실험을 통해 점성토 지반에 적용된 지오그리드 감쌈 쇄석말뚝의 침하량, 과잉간극수압, 응력분담비 그리고 지오그리드 변형률의 변화특성을 기존의 쇄석말뚝과 비교하여 분석하였다. 실험결과를 통하여 연약지반에 설치된 GESC는 단기 하중 재하시 쇄석기둥의 변형을 토목섬유의 인장력으로 구속 시켜 변형저항력의 증가와 침하저감 효과가 있음을 알 수 있으며 지오그리드의 최대 변형률은 1.2D와 1.5D에서 발생하는 것으로 나타났다. 본 논문에서는 반복하중 재하시 지오그리드 감쌈 쇄석말뚝에서의 지오그리드 감쌈 효과와 치환율이 쇄석말뚝에 미치는 영향을 고찰하였다.

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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 : 29
  • No :1
  • Pages :109-120
  • Received Date : 2012-10-26
  • Accepted Date : 2013-01-10
  • DOI :https://doi.org/10.7843/kgs.2013.29.1.109
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