摘要
To better describe excavation operations in deep geological formations,several aspects should be considered,especially the material anisotropy,time-dependent behavior,and hydromechanical coupling.In the present paper,a hydromechanical model based on the framework of continuous porous media was proposed.The mechanical elasto-viscoplastic constitutive model accounted for the material elastic and non-elastic anisotropies,using a transformation between the real transversely isotropic material and a fictitious isotropic material.Considering the hydraulic behavior,the permeability was expressed as a function of the volumetric viscoplastic strain.The model was applied to a case study of two tunnel excavations in an anisotropic rock under an initial anisotropic stress state.The results of the numerical simulations using a finite element code were in good agreement with the field convergence and permeability data.
