Reference : An elasto-viscoplastic model for chalk including suction effects
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An elasto-viscoplastic model for chalk including suction effects
Collin, Frédéric mailto [Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géomécanique et géologie de l'ingénieur >]
De Gennaro, Vincenzo [Ecole Nationale des Ponts et Chaussées > Institut Navier > CERMES > >]
Delage, Pierre [Ecole Nationale des Ponts et Chaussées > Institut Navier > CERMES > >]
Priol, Grégoire [Arcadis > > > >]
Unsaturated Soils: Advances in Geo-Engineering
Toll, David
Taylor & Francis
United Kingdom
1st European Conference on Unsaturated Soils (E-UNSAT 2008)
2-4 July 2008
United Kingdom
[en] During the six years long Pasachalk project devoted to the mechanical behaviour of high porosity chalks from North Sea oilfields, the constitutive model Pasachalk (Collin et al., 2002) was proposed based on the Barcelona Basic Model (BBM) (Alonso et al., 1990). The approach was based on the similarities found between the oil-water interactions (oil and water being the non wetting and wetting fluid respectively) in oil reservoir chalk and the air-water interactions in unsaturated soils. This approach appeared to be relevant to in-terpret the subsidence of the seafloor during waterflooding operations for enhanced oil recovery that has been observed in North Sea oilfields (e.g. Ekofisk oilfield). Another important component of subsidence was then related to the creep behaviour of the multiphase chalk (De Gennaro et al., 2003). A modified Pasachalk model was proposed to account for time effects using the framework of Perzyna’s viscoplasticity (1964) but without considering suction effects. Based on available experimental results (Priol et al., 2007), a modified version of the viscoplastic Pasachalk model including suction effects is proposed in this paper.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers ; Professionals

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