Axisymmetric Failure Mechanism of a Deep Cavity in Layered Soils Subjected to Pore Pressure
Publication: International Journal of Geomechanics
Volume 17, Issue 8
Abstract
To investigate the roof stability of deep cavities in layered soils, an axisymmetric failure mechanism based on the existing mechanism is proposed. Because deep cavities are generally under the water table, the adverse effects of pore pressure are taken into account. Limit analysis of the failure mechanism was conducted on the basis of the nonlinear power-law failure criterion, and upper-bound solutions of the failure curve were obtained. The procedure for the numerical calculation of the failure mechanism is proposed and the consistency of the failure mechanism is demonstrated. The roof failure involving two soil layers is discussed in detail to explain thoroughly the roof stability of deep cavities and tunnels in layered soils.
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Acknowledgments
Financial support was received from the National Basic Research 973 Program of China (Grant 2013CB036004) and the National Natural Science Foundation (Grant 51378510) for the preparation of this paper. This financial support is greatly appreciated.
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Published In
International Journal of Geomechanics
Volume 17 • Issue 8 • August 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Aug 2, 2016
Accepted: Dec 20, 2016
Published online: Mar 9, 2017
Published in print: Aug 1, 2017
Discussion open until: Aug 9, 2017
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