Strong discontinuities in partially saturated poroplastic solids

Callari, Carlo; Armero, F.; Abati, A.

doi:10.1016/j.cma.2010.01.002

Cited by 60 publications

(38 citation statements)

References 55 publications

(118 reference statements)

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“…Another approach can be modeling explicitly the ruptured zone with discontinuities in displacements. The latter was the subject of some early studies in order to model the strain localization induced by tunneling [10,11].…”

Section: Introductionmentioning

confidence: 99%

Coupled modeling of Excavation Damaged Zone in Boom clay: Strain localization in rock and distribution of contact pressure on the gallery’s lining

Salehnia

Collin

et al. 2015

Computers and Geotechnics

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a b s t r a c tAround galleries excavated at depth in geological media, the creation of a damaged zone with significant irreversible deformation is generally unavoidable. In the case of a geological disposal system for high-level radioactive waste, the resulting change in the host rock properties in this damaged zone may potentially be important with respect to the long-term evolution and the performance of that system. In this context, predicting the extent of the so-called Excavation Damaged Zone (EDZ) and, possibly, the fractures' network topology remains a challenge. This study is aimed to simulate numerically the extension of this zone at the large scale's excavation, around the Connecting gallery (HADES URL, Mol, Belgium), in Boom clay host rock through analyzing the evolution of strain localization in shear bands mode. To realistically model the involved phenomena, the concrete lining is considered on the gallery wall highlighting its impacts on the evolution of convergence and EDZ around the gallery. The focus of the current paper is made on analyzing the coupled hydro-mechanical behavior of Boom clay host rock during and after the gallery excavation with respect to the evolution of localized shear bands around the gallery. This study is accompanied by the analysis of the contact mechanism on the interface between the clay massive and the lining. The obtained results reveal some interesting features regarding the contact phenomenon relatively to the evolution pattern of shear bands within the clay around the gallery. To assess the reliability of the proposed approach, a discussion on some in-situ observations during the gallery's construction is also performed based on which a good agreement is found between the in-situ evidence and simulated results.

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Section: Introductionmentioning

confidence: 99%

Coupled modeling of Excavation Damaged Zone in Boom clay: Strain localization in rock and distribution of contact pressure on the gallery’s lining

Salehnia

Collin

et al. 2015

Computers and Geotechnics

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“…They detected the inception of strain localization by using the criterion based on the singularity of the underlying drained acoustic tensor. Callari et al (2010) stated that strain localization was triggered by a heterogeneous effective stress state induced by fluid flow coupling and no material imperfections were introduced. They used an approximation of a rate of average pore pressure, which appears in Lewis-Schefler effective stress.…”

Section: Introductionmentioning

confidence: 99%

“…It is because they did not provide either the soil description or the material parameters that it cannot be concluded whether the actual soil they modeled could realistically still be fully saturated in the corresponding suction range. Callari et al (2010) simulated the response of a perfectly homogeneous initially fully saturated uniformly deforming soil sample subjected to plane strain compression during which the atmospheric pressure was maintained at the top and bottom boundaries only. They detected the inception of strain localization by using the criterion based on the singularity of the underlying drained acoustic tensor.…”

Section: Introductionmentioning

confidence: 99%

Strain Localization in Unsaturated Elastic-Plastic Materials Subjected to Plane Strain Compression

2014

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“…Hence, for the analysis of these problems, the laws presented herein can be used as part of hyperelasto-plastic extensions of the proposed approach. A poro-plastic model of this kind is employed in the analysis of strain localization in variably saturated porous media performed by Callari et al (2010), extending the results presented for the fully saturated case by Armero and Callari (1999), Callari and Armero (2002). Another application example is the successful simulation by Callari (2009a) of the typical response of partially saturated soft grounds to tunneling.…”

Section: Discussionmentioning

confidence: 98%

“…We refer to Callari and Abati (2009) for a finite element formulation of the proposed laws, showing the numerical advantages offered by the constitutive approach considered herein. In this reference and in (Callari et al 2010), we also consider the setting of boundary conditions, including unilateral restraints on flow. Among the results presented herein, we have shown that the thermodynamic formulation by Biot can be successfully employed to evaluate the admissibility of effective stress equations besides the one proposed by Coussy.…”

Section: Discussionmentioning

confidence: 99%

Hyperelastic Multiphase Porous Media with Strain-Dependent Retention Laws

Callari

Abati

2010

Transp Porous Med

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This article presents poroelastic laws accounting for a retention behavior dependent also on porosity, as suggested by experimental evidence. Motivated by the numerical formulation of the corresponding boundary-value problem presented in a companion article, these constitutive equations employ displacements and fluid pressures as primary variables. The thermodynamic admissibility of the proposed rate laws for stress and fluid contents is assessed by means of symmetry and Maxwell conditions obtained from the Biot theory. In the case of strain-dependent saturation, the two elasticity tensors describing the drained response in saturated and unsaturated conditions, respectively, are proven to be in general not coincident, with their difference depending on capillary pressure and porosity. Furthermore, it is shown that besides the stress decomposition proposed by Coussy, also the stress split proposed by Lewis and Schrefler is consistent with the Biot framework. The former decomposition is obtained for retention laws depending only on capillary pressure, as expected. The Lewis-Schrefler split is proven to be consistent with retention models depending also on porosity. In these developments, the compressibility of all the phases is taken into account, in order to assess the thermodynamic consistency of an extension of the Biot's coefficient to partially saturated anisotropic porous media.

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Strong discontinuities in partially saturated poroplastic solids

Cited by 60 publications

References 55 publications

Coupled modeling of Excavation Damaged Zone in Boom clay: Strain localization in rock and distribution of contact pressure on the gallery’s lining

Coupled modeling of Excavation Damaged Zone in Boom clay: Strain localization in rock and distribution of contact pressure on the gallery’s lining

Strain Localization in Unsaturated Elastic-Plastic Materials Subjected to Plane Strain Compression

Hyperelastic Multiphase Porous Media with Strain-Dependent Retention Laws

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