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Bulletin of Engineering Geology and the Environment

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01-08-2009 | Original Paper

Engineering geological evaluation and preliminary support design for the metro extension tunnel, Ankara, Turkey

Authors: Aydın Özsan, Hakan Başarır, Serdar Yüceel, Özkan Cücen

Published in: Bulletin of Engineering Geology and the Environment | Issue 3/2009

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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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Title: Engineering geological evaluation and preliminary support design for the metro extension tunnel, Ankara, Turkey
Authors: Aydın Özsan
Hakan Başarır
Serdar Yüceel
Özkan Cücen
Publication date: 01-08-2009
Publisher: Springer-Verlag
Published in: Bulletin of Engineering Geology and the Environment / Issue 3/2009
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-009-0192-3

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