Undrained Stability Analysis of a Plane Strain Circular Tunnel Using Streamline Velocity Fields
Publication: International Journal of Geomechanics
Volume 19, Issue 5
Abstract
A new failure mechanism established from a streamline velocity field with energy dissipation through an internal deformable zone and the velocity discontinuity at its boundary is proposed. The application of the developed velocity field to the upper-bound theorem stability analysis of a shallow circular tunnel in nonhomogeneous undrained clay with a linear strength gradient of depth is further demonstrated. Comparisons of stability upper-bounds are made among the current mechanism with other reported solutions to verify the present method. A discussion on the optimal failure mechanism and the corresponding velocity field is presented.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Grant 51738010) and the National Key R&D Program of China (Grant 2016YFC0800200). These supports are gratefully acknowledged.
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Published In
International Journal of Geomechanics
Volume 19 • Issue 5 • May 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Jun 26, 2018
Accepted: Oct 24, 2018
Published online: Feb 18, 2019
Published in print: May 1, 2019
Discussion open until: Jul 18, 2019
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