3D Modeling of an NATM Tunnel in High Clay Using Two Different Constitutive Models
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 135, Issue 9
Abstract
This paper studies the accuracy of the three-dimensional finite-element predictions of a displacement field induced by tunneling using new Austrian tunneling method (NATM) in stiff clays with high conditions. The studies are applied to the Heathrow express trial tunnel. Two different constitutive models are used to represent London Clay, namely a hypoplastic model for clays and the modified Cam-clay (MCC) model. Good quality laboratory data are used for parameter calibration and accurate field measurements are used to initialize and void ratio. The hypoplastic model gives better predictions than the MCC model with satisfactory estimate for the displacement magnitude and slightly overestimated width of the surface settlement trough. Parametric studies demonstrate the influence of variation of the predicted soil behavior in the very-small-strain to large-strain range and the influence of the time dependency of the shotcrete lining behavior.
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Acknowledgments
The RKF-23 integration scheme used in the umat subroutine was programmed and kindly provided by Professor C. Tamagnini and Dr. E. Sellari. The writer acknowledges the financial support by the research Grant Nos. UNSPECIFIEDGACR 205/08/0732, UNSPECIFIEDGACR 205/07/0574, and UNSPECIFIEDMSM0021620855.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 135 • Issue 9 • September 2009
Pages: 1326 - 1335
Copyright
© 2009 ASCE.
History
Received: Aug 21, 2007
Accepted: Jan 24, 2009
Published online: Aug 14, 2009
Published in print: Sep 2009
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