Longitudinal arching effect of an under-passing tunnel on the existing tunnel undergoing a load of upper structures

상부 구조물 하중의 영향을 받는 기존터널에 직각 교차하는 하부 터널의 종방향 아칭효과

  • 이용준 (아주대학교 환경건설교통공학부) ;
  • 이상덕 (아주대학교 환경건설교통공학부)
  • Received : 2010.09.17
  • Accepted : 2010.11.02
  • Published : 2010.11.30


In the ease that a new cross tunnel is constructed under the existing tunnel, development of a longitudinal arching would be influenced by the existing tunnel. But it is not enough to investigate. Especially, the influence of the structure loads on the ground surface on the new tunnel, which the under-passes existing tunnel has been rarely studied. This study, therefore, aimed to clarify the effect of the existing tunnel and the structure on the ground surface on the development of a longitudinal ground arching during the excavation of a cross tunnel under the existing tunnel. Two-dimensional model tests were carried out in the test box, whose dimension was 30 cm (wide) ${\times}$ 113 cm (deep) ${\times}$ 87 cm (high). The existing tunnel was made of S21 steel tube in 16 cm diameter and 1 mm thickness. The ground surface load was 4.9 kPa and was loaded on the model structure in the size with 30 cm width ${\times}$ 16 cm height. New tunnel was excavated in 250 mm height by a bench cut method. As results, the longitudinal arching would be developed but it was severely influenced by not only the existing upper tunnel but also the ground surface load. The influence of the ground surface load on the development of longitudinal ground arching around a new tunnel showed the highest value when the tunnel face located direct under the surface load.


  1. 김동갑(2005), "기존터널에 근접한 하부 터널 굴착에 따른 교차부 지반의 거동", 아주대학교 박사학위논문.
  2. 김동갑, 김승현, 홍석봉, 이상덕(2005), "기존터널에 근접한 직각교차 하부 터널의 굴착에 따른 교차부지반의 거동(I)", 한국터널공학회 논문집, Vol. 7, No. 1, pp. 3-12.
  3. 김동갑, 이상덕(2005), "기존터널에 근접한 직각교차 하부 터널의 굴착에 따른 교차부지반의 거동(II)", 한국터널공학회 논문집, Vol. 7, No. 2, pp. 133-141.
  4. 이상덕(2005), 하부 터널 굴착에 따른 기존 상부 근접 병설터널의 안정성 연구, 아주대학교 토목기술연구센터.
  5. 정대열(1993), "터널 막장 주위의 3차원적 영향을 모사하는 2차원 해석 모델의 하중분배율에 관한 연구", 서울대학교 대학원 박사학위논문.
  6. Duddeck, H., Erdmann, J. (1985), "On structural design models for tunnels in soft soil", Underground Space, Vol. 9, Pergamon Press, pp. 246-259.
  7. Gnilsen, R. (1989), Numerical methods, Underground Structures Design and Instrumentation, EIsevier.
  8. Hoek, E., Brown, E. T. (1980), "Underground excavations in rock, The Institution of Mining and Metallurgy, London.