A thermodynamically consistent framework for saturated viscoplastic rock-materials subject to damage

Dufour, N.; Wong, Henry; Arson, Chloé; Deleruyelle, F.; Pereira, Jean‐Michel

doi:10.1016/j.mechrescom.2012.06.009

Cited by 15 publications

(7 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Apart from these three bulk phases, the interfaces between them can be considered to be the fourth phase, which has no volume, but possesses its own energy due to surface tension effect. This interfacial phase and energy have been mentioned in previous works using both phenomenological [4,[28][29][30] and micromechanical [31] approaches.…”

Section: General Poromechanical Frameworksupporting

confidence: 63%

A coupled poroplastic damage model accounting for cracking effects on both hydraulic and mechanical properties of unsaturated media

Bui

Wong

Deleruyelle³

et al. 2015

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

SUMMARYDamage induced by microcracking affects not only the mechanical behaviour of geomaterials but also their hydraulic properties. Evaluating these impacts is important for many engineering applications, such as the safety assessment of radioactive waste disposal facilities. This paper presents a new constitutive model accounting simultaneously for the impact of damage on hydraulic and mechanical properties of unsaturated poroplastic geomaterials. The hydro-mechanical coupling is formulated by means of the thermodynamic framework for partially saturated media, extended by taking into account isotropic damage and plasticity. State and complementary laws are governed by the so-called plastic effective stress and equivalent pore pressure. Assuming a bimodal pore size distribution for cracked porous media, the hydraulic part (water retention curve and hydraulic conductivity) is modelled using phenomenological functions of damage variable. The participation of damage on both mechanical and hydraulic part enables this model to describe bilateral couplings between them. This coupled model is then validated against a number of experimental data obtained from Callovo-Oxfordian argillite, which is the possible host rock for a radioactive waste disposal in France. Parametric studies are also carried out to check the consistency and to better demonstrate the bilateral couplings in the model.

show abstract

Section: General Poromechanical Frameworksupporting

confidence: 63%

A coupled poroplastic damage model accounting for cracking effects on both hydraulic and mechanical properties of unsaturated media

Bui

Wong

Deleruyelle³

et al. 2015

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

show abstract

“…Numerous damage-plasticity models were proposed for rocks starting in the early 2000's [Bennett and Borja, 2018, Chen et al, 2012, Chiarelli et al, 2003, Conil et al, 2004, Dufour et al, 2012, Le Pense et al, 2016, Parisio and Laloui, 2017, Parisio et al, 2015, Salari et al, 2004, Shen et al, 2001, Zhang et al, 2016, Zhou et al, 2008. Note that the list is far from exhaustive.…”

Section: Irreversible Deformationmentioning

confidence: 99%

Micro-macro mechanics of damage and healing in rocks

Arson¹

2020

Open Geomechanics

View full text Add to dashboard Cite

This paper presents the state of the art of the theory of rock damage and healing mechanics, with a particular emphasis on the strategies available to relate the micro-scale of crystals, cracks and pores to the scale of a Representative Elementary Volume (REV). We focus on mechanical degradation and recovery of stiffness and strength. Damage and healing models formulated in the author's group are used as examples to illustrate and compare the reviewed micromacro approaches, which include fabric enrichment, micromechanical formulations and homogenization schemes. This manuscript was written for doctoral students or researchers relatively new to the field of damage mechanics of geomaterials. Equations are provided to explain how to formulate a thermodynamically consistent model from scratch. Reviewing damage and healing modeling strategies led to the following conclusions: (i) The framework of hyperplasticity, which does not require any postulate on the existence or uniqueness of yield functions and which automatically ensures thermodynamic consistency, was never applied to Continuum Damage Mechanics (CDM). There may be an avenue to improve state-of-the-art damage and healing models in a similar framework of "hyperdamage mechanics". (ii) In damage softening models, the mesh dependence of the width of the damage localization zone is currently alleviated by non-local regularization. Perhaps the next step is to couple micro-macro damage and healing models at the REV scale to discrete fracture mechanics at a larger scale to understand how damage and healing localization occurs. (iii) There may be an opportunity to use fabric-enriched models to capture the effect of microstructure organization on both mechanical properties and permeability. (iv) Coupling chemomechanical damage and healing processes across the scales would be useful to model the competition between damagre and healing whenever both can occur at the same temperature and pressure conditions. (v) Many challenges still exist to implement healing models in the Finite Element Method, especially in regards to the mapping of net damage.

show abstract

“…Up to now, few attempts have been made to model damage in unsaturated geomaterials. Some models have been developed which consider damage in unsaturated geomaterials (Arson and Gatmiri, 2009), damage-plasticity couplings in saturated geomaterials (Chiarelli et al, 2003;Conil et al, 2004;Yu et al, 2013), damage and viscoplasticity in unsaturated geomaterials (Dufour et al, 2012), and even damage-plasticity couplings inunsaturated geomaterials (Hoxha et al, 2007;Jia et al, 2007). However, these models, initially formulated for rocks, ignore some specific important features of clayey soil behaviour, such as the dependence of elastic moduli to pressure.…”

Section: Dissipative Mechanisms: Hydro-mechanical Plasticity and Damamentioning

confidence: 99%

A fully coupled damage-plasticity model for unsaturated geomaterials accounting for the ductile–brittle transition in drying clayey soils

Pense

Arson

Pouya

2016

International Journal of Solids and Structures

View full text Add to dashboard Cite

To cite this version:Solenn Le Pense, Chloé Arson, Ahmad Pouya.A fully coupled damage-plasticity model for unsaturated geomaterials accounting for the ductile-brittle transition in drying clayey soils.International AbstractThis paper presents a hydro-mechanical constitutive model for clayey soils accounting for damageplasticity couplings. Specific features of unsaturated clays such as confining pressure and suction effects on elastic domain and plastic strains are accounted for. A double effective stress incorporating both the effect of suction and damage is defined based on thermodynamical considerations, which results in a unique stress variable being thermodynamically conjugated to elastic strain.Coupling between damage and plasticity phenomena is achieved by following the principle of strain equivalence and incorporating the double effective stress into plasticity equations. Two distinct criteria are defined for damage and plasticity, which can be activated either independently or simultaneously. Their formulation in terms of effective stress and suction allows them to evolve in the total stress space with suction and damage changes. This leads to a direct coupling between damage and plasticity and allows the model to capture the ductile/brittle behaviour transition occurring when clays are drying. Model predictions are compared with experimental data on Boom Clay, and the flexibility of the model is illustrated by presenting results of simulations in which either damage or plasticity dominates the coupled behaviour.

show abstract

A thermodynamically consistent framework for saturated viscoplastic rock-materials subject to damage

Cited by 15 publications

References 24 publications

A coupled poroplastic damage model accounting for cracking effects on both hydraulic and mechanical properties of unsaturated media

A coupled poroplastic damage model accounting for cracking effects on both hydraulic and mechanical properties of unsaturated media

Micro-macro mechanics of damage and healing in rocks

A fully coupled damage-plasticity model for unsaturated geomaterials accounting for the ductile–brittle transition in drying clayey soils

Contact Info

Product

Resources

About