Sustainability Analysis of Tabriz Subway Tunnel, Line 1.

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Sustainability Analysis of Tabriz Subway Tunnel, Line 1.

Akhgar M, Moumivand H.

J. Civil Eng. Urban., 5(4): 158-164, 2015; pii:S225204301500026-5

Abstract

In recent decades, metropolises of Iran have been more populated and urban transportation has become a serious and important issue. Subway tunnel construction is one of the fundamental methods in solving heavy traffic problem of metropolises like Tabriz. Subway tunneling in loose urban lands causes different problems. Line one of twin tunnels of Tabriz subway is numerically analyzed using software: analysis after excavation of first tunnel without installation of supporting system, after installation of supporting system of first tunnel, and after construction of second tunnel. However, displacement around the tunnel, ground subsidence, forces on tunnel supporting system and safety factor of supporting system are analyzed. Results of the study show the first tunnel is totally falling without supporting system. After installation of supporting system in first tunnel using precast reinforced concrete (segment), maximum ground subsidence is 6.39 mm that increased 45% after construction of second tunnel and reached to 9.28. Safety factor of first tunnel supporting system against forces on it and safety factor after construction of second tunnel is 1.81 and 1.85, respectively.
Keywords: Sustainable Analysis, Tabriz Subway Tunnel, Subsidence, Forces on the Tunnel Support System

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