Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Deformation Analysis of Shallow Tunnel Using Tunnel Model Test and Computational Analysis

모형시험과 수치해석을 이용한 저토피 터널의 변형거동에 관한 연구

  • Lee, Jae-Ho (Dept. of Civil Engrg., Kyungpook National University) ;
  • Kim, Young-Su (Dept. of Civil Engrg., Kyungpook National University) ;
  • Moon, Hong-Duk (Dept. of Civil Engrg., Jinju National University)
  • 이재호 (경북대학교 토목공학과) ;
  • 김영수 (경북대학교 토목공학과) ;
  • 문홍득 (진주산업대학교 토목공학과)
  • Published : 2008.01.31
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Abstract

The control and prediction of surface settlement, gradient and ground displacement are the main factors in shallow tunnel design and construction in urban area. For deformation analysis of shallow tunnel due to excavation it is important to identify possible deformation mechanism of shear bands developing from tunnel shoulder to the ground surface. This paper investigaties quantitatively the deformation behavior of shallow tunneling by model tunnel test and strain softening analysis Incorporating the reduction of shear stiffness and strength parameters. The comparison of model tunnel test result and numerical simulation using strain softening analysis showed good agreement in crown settlement, normalized subsidence settlement and developing shear bands above tunnel shoulder. In this study, it is blown that the strain softening modeling is applicable to the nonlinear deformation analysis of shallow tunnel.

지표면 침하량, 침하 기울기 그리고 터널주변의 지반 변위에 대한 관리와 예측은 도심지 저토피 터널의 설계와 시공에서 주요한 인자가 된다. 저토피 터널에서의 굴착에 따른 변형 해석은 터널 측벽부에서 지표부까지 발달하는 전단대의 변형특성을 파악하는 것이 중요하다. 본 연구는 2차원 실내 터널 모형실험과 전단 탄성계수 및 강도 정수의 저하를 고려한 변형률 연화모델 해석을 통하여 미고결 저토피 터널에서의 굴착으로 인한 변형 거동 특성을 규명해 보았다. 변형률 연화모델을 이용한 수치해석과 모형 터널 실험과의 비교에서 지표면 침하, 천단침하 그리고 전단대의 발달형태에서 부합되는 결과가 나타났다. 본 연구에서 변형률 연화모델은 저토피 터널의 비선형 변형해석에 대하여 적용성이 있음을 알 수 있었다.

Keywords

References

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