Engineering geological evaluation and preliminary support design for the metro extension tunnel,Ankara, Turkey |
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| Authors: | Ayd?n Özsan Hakan Ba?ar?r Serdar Yüceel Özkan Cücen |
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| Affiliation: | (1) Department of Geological Engineering, Faculty of Engineering, Ankara University, 06100 Ankara, Turkey;(2) Department of Mining Engineering, Inonu University, 44280 Malatya, Turkey;(3) The Graduate School of Natural and Applied Sciences, Ankara University, 06100 Ankara, Turkey;(4) Transportation Rail System of the EGO General Directorate of Greater Municipality, Ankara, Turkey |
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| Abstract: | The paper reports an assessment of the engineering geological characteristics of the rock mass to be encountered between Mecidiye
and Gazino stations on the new extension of the Ankara metro and the determination of appropriate support and excavation methods.
The rock mass quality was estimated using the rock mass rating (RMR), geological strength index (GSI) and rock mass quality
(Q) systems and the tunnel divided into sections. The RMR, Q and NATM systems were used to determine the support and excavation methods in these areas. The deformations and stress concentrations
around each tunnel section were investigated and the interaction of the support systems with the rock mass was analyzed using
finite element software. It is concluded that rock mass classification systems should be used in tandem with numerical tools,
although it is emphasized that the estimation of rock mass properties is not an exact science and both rock properties and
numerical models should be refined based on observations and the results of instrumentation installed during the construction
of a tunnel.
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| Keywords: | Ankara metro RMR Q system GSI NATM Tunnel support |
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