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2017 Vol.33, Issue 10 Preview Page
A Study on the Restraint Effect on Lateral Displacement of an Inclined Earth Retaining Structure Integrated with Soil Nailing in Sandy Ground

사질토지반에 설치된 소일네일 복합형 IER의 수평변위 억제효과에 관한 연구

Tae-Keon Park1
,
Jong-Chul Im2*
,
Jae-Won Yoo3
,
Chang-Young Kim3
,
Sang-Kyun Kang4
,
Woo-Je Lee4
박 태건1
,
임 종철2*
,
유 재원3
,
김 창영3
,
강 상균4
,
이 우제4
1Member, Graduate Student, Dept. of Civil and Environmental Engrg., Pusan National Univ.
2Member, Prof., Dept. of Civil and Environmental Engrg., Pusan National Univ.
3Member, Researcher of Research Industrial Technology, Pusan National Univ.
4Member, Graduate Student, Dept. of Civil and Environmental Engrg., Pusan National Univ.
1부산대학교 사회환경시스템공학과 박사과정
2부산대학교 사회환경시스템공학과 정교수
3부산대학교 생산기술연구소 특별연구원
4부산대학교 사회환경시스템공학과 박사과정
*교신저자. *Corresponding Author. 
31 October 2017. pp. 33-47
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Abstract

A self-supported temporary excavation method called IER is normally applicable to excavation depth ranging from 6.0 m to 7.0 m though the method depends on ground condition and overburden load. Combining IER with another method is required in deeper excavation depth in order to maintain the structural stability of the IER. In this study, we performed model tests and 3D FE analysis to check the stability of the IER adopting soil nailing method, and to propose its effective installation method. The lateral displacement of the IER using soil nailing decreased by 92% of that of IER without soil nailing. Optimum design is possible for both economic feasibility and stability when interval spacing and length of soil nails is 1.5 m (Sh) × 0.75 m (Sv) and 86% of excavation depth, respectively. Excavation depth using IER increases 1.71 times by adopting soil nailing in increment of lateral displacement of IER right before the last excavation stage.

Keywords
Inclined earth retaining structure
Soil nailing
Laboratory model test
Finite element analysis

지주식 흙막이 공법(Inclined Earth Retaining Wall; 이하 IER)은 지반 조건과 상재하중 등의 영향에 따라 다르지만 일반적으로 6.0～7.0m의 굴착 심도에서 자립이 가능하다. 하지만 더 깊은 심도의 굴착과 이에 따른 안정성을 확보하기 위해서 다른 공법과 병행하여 적용 할 필요가 있다. 따라서 본 연구에서는 IER에 소일네일링 공법을 적용한 복합형 IER의 안정성을 확인하고 효율적인 설치방법을 제안하고자 실내모형실험과 3차원 유한요소해석을 실시하였다. 실내 모형실험 결과 소일네일을 설치하였을 때가 설치하지 않았을 때와 비교하여 수평변위가 약 92% 감소하는 것으로 분석되었고, 3차원 유한요소해석 결과 소일네일 간격은 수평방향 × 수직방향 간격이 1.5m × 0.75m이고, 길이는 굴착 심도의 86%일 때 경제성과 안정성이 최적인 결과가 나타나는 것으로 분석되었다. 또한, IER의 변위가 크게 증가하는 굴착 심도 이전의 굴착 단계에 소일네일을 설치하였을 때 최대 1.71배 더 굴착이 가능한 것으로 분석되었다.

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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 : 33
  • No :10
  • Pages :33-47
  • Received Date : 2017-06-28
  • Accepted Date : 2017-09-27
  • DOI :https://doi.org/10.7843/kgs.2017.33.10.33
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