Abstract
This paper presents an implementation to solve problems involving the hydromechanical (HM) coupling in fractured rock masses. HM coupling is one of the relevant couplings of interest in the engineering analysis of rock mass behaviour. Present implementation makes use of the multilaminar concept as introduced by Zienkiewicz and Pande [19] with which the mechanical behaviour of intact rock and families of fractures can be simulated. The non linearities in the constitutive relations are dealt with by means of fictitious viscoelasticity/viscoplasticity. Barton-Bandis model was used to model the mechanical behaviour of fractures. Shear stress/shear displacement/dilatancy relationship was modeled as viscoplastic and the normal stress/normal displacement as nonlinear viscoelastic. Flow along fractures was considered to occur as a sequence of permanent states. The permeability tensor of the equivalent continuum is determined from the hydraulic apertures in accordance with Barton et al [2]. Validation examples are presented for both coupled and uncoupled situations.
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