Effect of TBM Advance in the Structural Response of Segmental Tunnel Lining
Publication: International Journal of Geomechanics
Volume 17, Issue 9
Abstract
This study investigated the structural response of segmental tunnel linings to tunnel-boring machine (TBM) advance during the construction of a typical tunnel built in Mexico. Because of the thrusting of the TBM during excavation, an axial load acts along the longitudinal axis of the tunnel. This axial load decreases as the TBM advances away from the tunnel lining. However, the residual axial load continues acting on the lining, producing a coupling between rings that affects the structural response of the tunnel. In this paper, this effect is studied by means of finite-element models. A nonlinear parametric study was carried out in which the material properties, the influence of the number of rings, the residual axial load, and the position of continuous joints were examined. The numerical models were calibrated with (lab-based) experimental results obtained from the literature on a typical tunnel built in Europe. It was concluded that the residual load increases the structural capacity of the lining. Also, the study showed that the collapse mechanism was modified by the coupling between rings. Rings will fail by excessive deformations with less coupling, while with greater coupling, the collapse mechanism is caused mainly by cracking in the segments. Therefore, it is necessary to consider the effect of the TBM advance to evaluate the structural response of a segmental tunnel better.
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Acknowledgments
The authors acknowledge the financial support of the Comisión Nacional del Agua–CONAGUA of the Mexican government, PRODEP projects (Nuevo PTC, UGTO-PTC 428, and 460), and Project Convocatoria Institucional de Investigación 2016-2017 (Clave 947/2016). The first author acknowledges the doctoral research grant of the Consejo Nacional de Ciencia y Tecnología–CONACYT of the Mexican government and the postdoctoral research grant of the Instituto de Ingeniería, Universidad Nacional Autónoma de México.
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Information & Authors
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Published In
International Journal of Geomechanics
Volume 17 • Issue 9 • September 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Mar 9, 2016
Accepted: Feb 13, 2017
Published online: May 24, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 24, 2017
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