Deformation analysis of shallow tunneling with unconsolidated soilusing nonlinear numerical modeling
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
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.
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.
참고문헌 (15)
- Adachi, T, "Behavior and simulation of sandy ground tunnel", Proceedings of JSCE, (358), pp.129~136 (1985)
- Akutagawa, S, "Numerical simulation of a large scale slope failure considering reduction of stiffness and strength over time", Journal of the Society of Materials Science, 55(5), pp.515~522 (2006)
- Cividini, A, "A finite element analysis of direct shear tests on stiff clays", International Journal for Numerical and Analytical Methods in Geomechanics, 16, pp.869~886 (1992)
- Gioda, G, "Back analysis of the measurements performed during the excavation of a shallow tunnel in sand, International Journal for Numerical and Analytical Methods in Geomechanics", 23, pp.1407~1425 (1999)
- Hansmire, W.H, "Soil tunnel test section: Case history summary", J. Geotech. Eng. Div. Am. Soc. Civ. Eng., 111, pp.1301~1320 (1985)
- Kim, C.Y, "New guideline for geomechanical design", construction of conventional NATM tunnel, 2005, pp.7(1), 73~88
- 이용주, "터널모형실험을 통한 사질토 지반에서의 K값의 산정", 한국터널지하공간학회 논문집, 12(1), pp.87~94 (2010), 사단법인 한국터널지하공간학회
- Murayama, S, "On the settlement of granular media caused by the local yielding in the media", Proceedings of JSCE, 172, pp.32~41 (1969)
- Potts, D, "Guidelines for the use of advanced numerical analysis", pp.133~135 (2002), European Commission
- Sakurai, S, "Deformational analysis of geomaterials considering strain-induced damage", Proc. 4th. Europ., pp.729~738 (1998)
- Schuller, H, "Appplication of a Multilaminate Model to simulation of shear band formation in NATM-tunnelling", Computers and Geotechnics, 29, pp.501~524 (2002)
- Sterpi, D, "An analysis of geotechnical problems involving strain softening", Int. J.Num. Analyt. Meth. Geomech., 23, pp.1427~1454 (1999)
- Sterpi, D, "Numerical analysis of laboratory tests on a model tunnel", Asaoka, Adachi and Oka editors, Proc.Deformation and Progressive Failure in Geomechanics, pp.211~216 (1997)
- Wong, R.C.K, "Performance assessment of tunnels in cohesionless soils", J. Geothech. Engng., ASCE, 117(12), pp.1880~1901 (1991)
- You, K.H, "An Assessment of Safety Factor for Tunnels Excavationed in a Weak Rock layer", Tunnelling Technology, 2(3), pp.47~57 (2000)