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Stress analysis for shotcrete lining on uneven tunnel perimeter
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 Title & Authors
Stress analysis for shotcrete lining on uneven tunnel perimeter
Lee, Seungdo; Moon, Hyun-Koo;
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When a tunnel is constructed by drilling and blasting operation, the excavated perimeter becomes uneven due to overbreak at the drill holes so that the thickness of shotcrete tends to be irregular. In this case, the conventional stress analyses for tunnel lining of a uniform thickness cannot be readily applicable. In this study, the profile of tunnel perimeter assumed to be sinusoidal in order to simulate the uneven tunnel perimeter and to control the thickness of shotcrete by using the amplitude and wavelength. By adopting the sinusoidal function to a theoretical solution of stress analysis for uniform lining, the range of axial stress of irregular shotcrete can be estimated. The applicability of the approximate solution has been verified by performing a series of numerical analyses for various conditions. It is shown that the axial stress of shorcrete is highly dependent upon the irregularity of shotcrete, together with the ground property and initial stress conditions. It is also shown the shear stress is dependent upon the wavelength, and the stress condition becomes unfavorable where the thickness of shotcrete is relatively small. The approach developed in this study shows that the stress state where the thickness is relatively small is unfavourable, and it is necessary to take complementary measures when installing shotcrete after blasting.
Shotcrete;Stress analysis;Uneven perimeter;Irregular lining;Sinusoidal function;
 Cited by
Bae, G.J., Chang S.H., Lee, S.W., Park, H.G. (2004), "Evaluation of interfacial properties between rock mass and shotcrete", Int J Rock Mech Min Sci, pp. 106-112.

Chen, S.H., Fu, C.HG., Isam, S. (2009), "Finite element analysis of jointed rock masses reinforced by fully-grouted bolts and shotcrete lining", Int J Rock Mech Min Sci, Vol. 46, No. 1, pp. 19-30. crossref(new window)

Einstein, H.H., Schwartz, C.W. (1979), "Simplified analysis for tunnel supports", J Geotech Eng, Vol. 105, No. 4, pp. 499-518.

Kim, H.J., Kim, M.R. (2014), "Case studies for the stress measurements on the shotcrete tunnel lining", J Korean Soc Eng Geol, Vol. 24, No. 1, pp. 81-89.

Lee, S.D., Harrison, J.P. (2001), "Empirical parameters for non-linear fracture stiffness from numerical experiments of fracture closure", Int J Rock Mech Min Sci, Vol. 38, No. 5, pp. 721-727. crossref(new window)

Malmgren, L., Nordlund, E. (2008), "Interaction of shotcrete with rock and rock bolts - A numerical study", Int J Rock Mech Min Sci, Vol. 45, No. 4, pp. 538-553. crossref(new window)

Mason, D.P., Stacey, T.R. (2008), "Support to rock excavations provided by sprayed liners", Int J Rock Mech Min Sci, Vol. 45, No. 5, pp. 773-788. crossref(new window)

Muir Wood, A.M. (1975), "The circular tunnel in elastic ground", Geotechnique, Vol. 25, No. 1, pp. 115-127. crossref(new window)

Peck, R.B., Hendron, A.J., Mohraz, B. (1972), "State of the art of soft-ground tunnelling", Proceeding of the North American rapid excavation & tunneling conference, Chicago, pp. 259-86.

Son, M., Cording, E.J. (2007), "Ground-liner interaction in rock tunnelling", Tunnel Underground Space Technol, Vol. 22, No. 1, pp. 1-9. crossref(new window)

Zhang, P. (2013), "A 3DEC numerical analysis of the interaction between uneven rock surface and shotcrete lining", Research Report, Lulea University of Technology, p. 55.