Construction Procedures Evaluation of Three Adjacent Tunnels and Excavation Step Effects

Authors: M. Mahdi, N. Shariatmadari

Abstract:

Since, both the relative position of tunnels and the construction procedure affect the soil movement and internal forces in the lining, it is of major concern to study the influence of these factors on the tunnel design. Construction procedures of tunnels have considerable effects on the magnitude of surface movements and lining stresses. This paper describes numerical analysis of construction procedure of a three adjacent shallow tunnels at high groundwater levels using the commercial finite difference software (FLAC-3D). The aim of this study is to determinate the most suitable construction procedure for the three tunnels and the optimum excavation step in Tehran Metro tunnels in order to optimize the surface settlements and lining stresses.

Keywords: Shallow tunnel, multiple tunnels, construction procedure, surface movement, numerical modeling.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1090837

References:

[1] F. Prinzl & A.R.A Gomes "The requirement of Protective measure for building affected by ground movements due to shield Tunneling in soft ground” Proc. Tunnels and Metro Polises Edited by A.Negro Jr & A. A. Ferreira , vol.2 A. A. Balkema 1998.
[2] D.K. Koungelis & C.E. Augarde "Interaction between multiple tunnels in soft ground” .School of Engineering, University of Durham, UK 2004.
[3] D.N. Chapman, S.K. Ahn, and D.V.L. Hunt" Investigating ground movements caused by the construction of multiple tunnels in soft ground using laboratory model tests '' , Canadian Geotechnical Journal, volume 44, Number 6 jun 2007, ISSN 1208-6010 , Pages 513-523.
[4] F. Hage Chehade and I. Shahrour, "Numerical analysis of the interaction between twin-tunnels: Influence of the relative position and construction procedure '', Tunneling and Underground Space Technology, Volume 17, Issues 2-3, Jun.2007, Page 213.
[5] D. N. Chapman, S. K. Ahn, D. Hunt and A. Chan, "The use of model tests to investigate the ground displacements associated with multiple tunnel construction in soil”, Tunneling and Underground Space Technology, Vol. 21, Issues 3-4, May-July 2006, Page 413.
[6] M. Marata , T. Okazawa "shallow twin tunnel for six lanes beneath densely residential area” Proc. North American Tunneling, Edited by Levent Ozdemir, A. A. Balkema, 1996.pp 371-380 .
[7] X. Guogang, M. Guoyan, L. Qingbo and C. Zhifang, "Predicting the settlements above twin tunnels constructed in soft ground”, Tunneling and Underground Space Technology, Volume 19, Issues 4-5, July-September 2004, Page 378.
[8] M. Karakus and R. J. Fowell, "Effects of different tunnel face advance excavation on the settlement by FEM”, Tunneling and Underground Space Technology, Vol. 18, Issue 5, November 2003, Pages 513-523.
[9] G. N. Pande, J. R. William "Numerical Methods in Rocks Mechanics” John Wiley and Sons Ltd 1990.
[10] B. M. New and M. P. O’Riely "Tunneling induced ground movements-Predicting their magnitude and effects” Ground movements and structures vol. 4, Edited by James D.1991.
[11] C. T. Chang, M. C. Lee and P. C. Hov "Design of twin–tube tunnel through soft rock” Geotechnical Aspects of Underground Construction in soft Ground. Balkema, Rotterdam, 1996, pp. 251-255.