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2010 Vol.12, Issue 2
Deformation analysis of shallow tunneling with unconsolidated soilusing nonlinear numerical modeling

비선형 수치모델링을 이용한미고결 지반 저토피 터널의 변형해석

Jae-Ho Lee1
,
Young-Su Kim2
,
Ji-Hyeung Yoo3
,
Yun-Young* Jeong4*
이 재호1
,
김 영수2
,
유 지형3
,
정 윤영*4*
1Director, Ph. D., MecaGeotech Co., Ltd.
2Professor, Dept. of Civil Engineering, Kyungbook National University
3Professor, Dept. of Civil Engineering, Kyungil University
4Assistant Manager, Ph.D, Tunnel Engineering DIV, Choungsuk Engineering Co., Ltd.
*교신저자. *Corresponding Author. 
31 March 2010. pp. 105-116
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Abstract

The estimation of surface settlement, ground behavior and tunnel displacement are the main factors in urban tunnel design with shallow depth and unconsolidated soil. On deformation analysis of shallow tunnel, it is important to identify possible deformation mechanism of shear bands developing from tunnel shoulder to the ground surface. This paper investigated the effects of key design parameter affecting deformation behavior by numerical analysis using nonlinear model incorporating the reduction of shear stiffness and strength parameters with the increment of the maximum shear strain after the initiation of plastic yielding. Numerical parametric studies are carried out to consider the reduction of shear stiffness and strength parameters, horizontal stress ratio, cohesion and shotcrete thickness.

Keywords
Nonlinear Numerical analysis
deformation behavior
tunnel
unconsolidated soil

지표면 침하량, 지반거동 그리고 터널변위에 대한 평가는 미고결 저토피 도심지터널의 설계에서 주요한 인자가 된다. 이와 같은 터널에서 굴착에 따른 변형 해석은 터널 측벽부에서 지표부까지 발달하는 전단대의 변형특성을 파악하는 것이 중요하다. 본 연구는 소성항복이 시작된 후 최대 전단변형률증분과 함께 전단 탄성계수과 강도 정수의 저하를 고려할 수 있는 비선형 모델방법을 통하여 터널 변형거동에 끼치는 주요 설계인자의 효과에 대해 수치해석적 매개변수를 통해 분석하였다. 수치해석적 매개변수에 있어서 강도정수의 감소와 전단변형률의 증분, 초기지중응력, 점착력 그리고 숏크리트의 두께를 고려하여 수행하였다.

키워드
비선형 수치해석
변형거동
터널
미고결 지반
References
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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 : 12
  • No :2
  • Pages :105-116
  • Received Date : 2009-04-01
  • Revised Date : 2010-02-24
  • Accepted Date : 2010-03-08
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