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  Effect of Hydraulic Conditions in controlling the Face in EPB Exca vated Tunnels

  This paper investigates numerically face stability and deformation of EPB tunnels excavated below the groundwater table. Emphasis is given in the proper simulation of the pressure exerted by the excavated material filling the front chamber of the EBP machine. The paper presents the results of 3D coupled hydromechanical analyses for tunnel face stability, using the computer code ABAQUS with the Mohr–Coulomb and Modified Cam-Clay constitutive models, for various geotechnical and hydraulic conditions. The undrained shear strength of the ground is shown to be an effective control parameter for interpreting and normalising the results under different geotechnical conditions, irrespective of the adopted constitutive model.

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