DBPapers
DOI: 10.5593/sgem2011/s02.101

3-DIMENSIONAL NUMERICAL MODELING OF TUNNEL INDUCED DEFORMATION FIELD (NECATIBEY SUBWAY STATION, ANKARA, TURKEY)

AUTHOR/S: O. Akturk, V. Doyuran
Monday 1 August 2011 by Libadmin2011

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 1, 331-338 pp

ABSTRACT
In heavily settled areas, deformations induced by the tunnel excavation may cause
serious damage to nearby structures. Therefore, it is necessary to study effective means
of controlling tunnel induced deformations. The main parameters affecting the failure
and deformation state of the soil around a circular underground opening are the physical
characteristics of the soil, the diameter of the opening, and the support pressure. In this
study, 3-Dimensional (3D) FDM analyses were conducted to assess tunneling induced
deformations, along with movements around Necatibey Station of Kızılay-Çayyolu
metro line (Ankara, Turkey). During sequential excavations, temporary and permanent
shotcrete lining was also simulated. The soil behavior is assumed to be governed by an
elastic-perfectly plastic constitutive relation based on the Mohr–Coulomb criterion. The
computed deformations around these openings have been compared with the in-situ
measurements. The results of the study revealed that the 3-D elasto-plastic analyses
yield comparably good correlation with the in-situ measurements.

Keywords: Kızılay-Çayyolu metro line, Necatibey Station, circular opening, 3-D
numerical modeling, finite difference method, elastic-perfectly plastic constitutive
relation.

PAPER 2011/s02.101: 3-DIMENSIONAL NUMERICAL MODELING OF TUNNEL INDUCED DEFORMATION FIELD (NECATIBEY SUBWAY STATION, ANKARA, TURKEY)

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