DBPapers
DOI: 10.5593/SGEM2015/B12/S2.001

3D NUMERICAL ANALYSIS OF PRIMARY TUNNEL LINING

M. Mohyla, K.Vojtasik, E. Hrubesova, J.Zdvorak
Friday 7 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-32-2 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 2, 3-8 pp

ABSTRACT
A considerable number of the contemporary underground long works is built after the principles of New Austrian Tunneling Method (NATM). The tunnel lining is built as a double-layer structure (primary and secondary tunnel lining). The primary tunnel lining provides a transient ground support before the construction of a secondary lining is finished and takes up the permanent support of ground. In addition a response of the primary lining controls the oncoming ground load on the secondary lining. The article presents results of 3D analysis of stress-strain state in a primary tunnel lining in the course of lining construction steps and after its completion. The analysis takes into account all the significant elements of NATM such as controlled support the rock mass shortly after work excavation, heterogeneous cross section of primary tunnel lining - shotcrete, steel elements, their spatial distribution in the cross section of the lining and shotcrete variable deformation parameters in time.

Keywords: primary tunnel lining, stress strain state, 3D numerical model