Stability Factors Fc, Fs, and Fγ for Twin Tunnels in Three Dimensions
Publication: International Journal of Geomechanics
Volume 22, Issue 3
Abstract
This paper aims to study the three-dimensional (3D) tunnel heading pressure of twin circular tunnels in a drained cohesive–frictional soil using a stability factor approach and finite-element limit analysis (FELA). The primary concept adopted will be the use of a conventional equation that is similar to the traditional bearing capacity factors (e.g., Nc, Ns, and Nγ) in Terzaghi’s bearing capacity equation. For various spacing ratios (S/D) between the tunnels, the stability of the tunnels is expressed in terms of nondimensional tunnel stability factors (e.g., Fc, Fs, and Fγ), which are functions of the depth ratio (C/D) and soil internal friction angle (ϕ). For conciseness, the results will be presented in charts and tables with the tunnel stability factors that used the rigorous FELA upper (UB) and lower bound (LB) solutions.
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Published In
International Journal of Geomechanics
Volume 22 • Issue 3 • March 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 6, 2021
Accepted: Oct 11, 2021
Published online: Dec 20, 2021
Published in print: Mar 1, 2022
Discussion open until: May 20, 2022
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