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Investigation of soil behaviour due to excavation below the grouped pile according to shape of tunnel station

터널 정거장 형상에 따른 군말뚝 하부 굴착 시 지반거동 연구

Suk-Min Kong1
,
Dong-Wook Oh1
,
Jong-Hyen Lee2
,
Yong-Joo Lee3*
공 석민1
,
오 동욱1
,
이 종현2
,
이 용주3*
1Ph.D. Course, Dept. of Civil Engineering, Seoul National University of Science & Technology
2Master Course, Dept. of Civil Engineering, Seoul National University of Science & Technology
3Professor, Dept. of Civil Engineering, Seoul National University of Science & Technology
1서울과학기술대학교 건설시스템공학과 박사과정
2서울과학기술대학교 건설시스템공학과 석사과정
3서울과학기술대학교 건설시스템공학과 교수
*교신저자. *Corresponding Author. 
31 January 2018. pp. 83-97
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Abstract

Tunnels are widely used for special purposes including roads, railways and culvert for power transmission, etc. Its cross-section shape is determined by uses, ground condition, environmental or economic factor. Many papers with respect to behaviours of adjacent ground and existing structure tunnelling-induced have been published by many researchers, but tunnel cross-section have rarely been considered. A collapse of tunnel causes vaster human and property damage than structures on the ground. Thus, it is very important to understand and analyse the relationship between behavoiurs of ground and cross-section type of tunnel. In this study, the behaviour of ground due to tunnel excavation for underground station below the grouped pile supported existing structure was analysed through laboratory model test using a trap-door device. Not only two cross-section types, 2-arch and box, as station for tunnel, but also, offset between tunnel and grouped pile centre (0.1B, 0.25B, 0.4B) are considered as variable of this study. In order to measure underground deformation tunnelling-induced, Close Range Photogrammetry technique was applied with laboratory model test, and results are compared to numerical analysis.

Keywords
Tunnel station excavation
Tunnel cross-section type
Close range photogrammetry
Numerical analysis
Grouped pile

터널은 도로, 철도, 지하철과 같은 교통의 통로이자 수로, 전력구, 비축기지와 같은 특수목적을 위해 널리 활용되고 있으며, 터널의 사용 목적, 주변 지반조건 및 경제성에 따라 다양한 터널 형상으로 시공되고 있다. 이에 대해 기존 터널과 주변지반 및 구조물에 관한 연구는 꾸준하게 발표되었으나 단일 형상에 대해 터널굴착 시 주변 지반과 구조물의 거동을 분석한 연구들이 대다수이다. 터널의 붕괴사고는 지상 구조물의 붕괴사고 보다 막대한 인적, 물적 손실을 가져오기 때문에 터널 굴착 및 주변지반의 거동을 관측하고 분석하는 작업은 매우 중요하며, 단일 형상이 아닌 다양한 터널 형상에 대한 연구가 필요할 것으로 판단된다. 따라서, 본 연구는 trapdoor장치를 이용한 실내 모형시험을 통해 군말뚝 하부에 터널 정거장 굴착 시 주변지반의 거동을 측정하였다. 이때 터널 정거장 형상의 단면을 arch와 box 형태로 제작하였으며, 각 터널 정거장 형상 별 0.1B, 0.25B, 0.4B로 터널과 군말뚝 간 이격거리를 다르게 하여 다양한 조건에서의 지반거동을 분석하였다. 또한, 근거리 사진계측 및 이미지프로세싱 기법을 통해 지반의 거동을 관측하였으며, 유한요소 수치해석을 통해 실내 모형시험, 근거리 사진계측의 결과와 비교․분석하였다.

키워드
터널 정거장 굴착
터널 형상
근거리 사진계측
수치해석
군말뚝
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 20
  • No :1
  • Pages :83-97
  • Received Date : 2017-12-01
  • Revised Date : 2017-12-29
  • Accepted Date : 2018-01-05
  • DOI :https://doi.org/10.9711/KTAJ.2018.20.1.083
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