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  Reliability of face stability in shallow tunnel using the Caquot´s lower bound solution

  One of the most important issues related to shallow tunnel construction is the face stability. Face stability has been studied by limit analysis theorems and numerical modeling. Carranza-Torr integrated the Caquot´s lower bound problem of cavity collapse for an elastic-plastic Mohr-Coulomb material. This paper presents the reliability analyses performed for a 10 m diameter shallow tunnel based on the Carranza-Torres´ solution CTS. The reliability of this tunnel was studied by Mollon a. The CTS exhibited higher values of internal pressure to guarantee the stability of the tunnel than those obtained by numerical models performed by Mollon . and the upper bound solution The CTS is easy to be used and yields values comparable to those obtained by more sophisticated methods with significant saving of time and computational effort.

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