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2016 Vol.18, Issue 1 Preview Page
The numerical study on the ground settlement behavior of box type tunnel enlargement

2차원 수치해석을 통한 초저심도 박스형 터널 편측확폭시 지반침하거동 특성 분석

Yohan Cha1
,
Gye-Chun Cho2
,
Eun-soo Hong3*
차 요한1
,
조 계춘2
,
홍 은수3*
1Ph. D Candidate, Department of Civil and Environmental Engineering, KAIST
2Professor, Department of Civil and Environmental Engineering, KAIST
3Research Associate Professor, Department of Civil and Environmental Engineering, KAIST
1KAIST 건설 및 환경공학과 박사과정
2KAIST 건설 및 환경공학과 교수
3KAIST 건설 및 환경공학과 연구부교수
*교신저자. *Corresponding Author. 
31 January 2016. pp. 83-94
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Abstract

Utility tunnels have been employed in Korea since the 1970s and start to make trouble with structural safety and serviceability. Recently, tunnel enlargement has consequently been proposed due to the impending problems. However there are little study on the ground settlement behavior of box type utility tunnels except traffic tunnels. A 2D finite element analysis was conducted to evaluate ground behavior which depends on enlargement size and stiffness by one-side enlargement of the utility tunnel. Settlement scale increased with larger enlargement size and less stiff ground conditions. The observed settlement characteristics due to enlargement are similar to that suggested by Clough & Schmidt (1981). The settlement width is more affected by enlargement size than ground condition.

Keywords
Box-type tunnel
Tunnel enlargement
Ground settlement behavior
Numerical analysis

1970년대 후반부터 설치된 공동구는 노후화에 따른 구조적 안정성과 수용시설의 변화에 따른 사용성이 문제가 될 수 있다. 노후 공동구의 확폭 재시공은 이에 대한 대안이 될 수 있지만 터널확폭에 대한 연구는 대부분 일정 심도 이상의 교통터널에 대하여 수행되었으며 저심도의 박스형 공동구에 대하여는 거의 연구가 이루어지지 않았다. 이 연구에서는 2차원 유한요소해석을 이용하여 공동구 터널을 편측확폭하는 경우 지반의 강성조건과 확폭 규모에 따라 확폭이 지반 침하에 미치는 영향을 분석하고자 하였다. 연구결과 최대 지표침하는 확폭 규모가 크거나 지반 강성이 작을수록 크게 발생하였다. 박스형 터널의 편측확폭시 침하 양상은 Clough & Schmidt (1981)의 제안과 유사하게 나타났으며, 침하 영향범위는 지반특성보다 확폭의 크기에 더 영향을 받는 것으로 나타났다.

키워드
박스형 터널
터널 확폭
지반 침하
수치해석
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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 : 18
  • No :1
  • Pages :83-94
  • Received Date : 2015-01-08
  • Revised Date : 2016-01-22
  • Accepted Date : 2016-01-26
  • DOI :https://doi.org/10.9711/KTAJ.2016.18.1.083
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