An elastoplastic model for unsaturated rocks and concrete

Bourgeois, Frédéric; Shao, Jian‐Fu; Ozanam, O.

doi:10.1016/s0093-6413(02)00306-3

Cited by 27 publications

(13 citation statements)

References 7 publications

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“…In order to model the principal features of unsaturated materials, a phenomenological approach is used by many authors (e.g. References [31][32][33]). Firstly, this kind of approach allows to overcome the limitations of the different effective stress representations to model an important experimental result: the real increase in strength and cohesion due to the increase in capillary attraction forces, in soils for example.…”

Section: 24mentioning

confidence: 99%

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Effect of suction on the mechanical behaviour of iron ore rock

Grgic

Giot

Homand

et al. 2005

Num Anal Meth Geomechanics

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The effect of suction on the behaviour of iron ore has been studied from both physical and mechanical points of view. The porosity and the suction phenomena have been analysed using different experimental techniques. Uniaxial compressive tests on partially saturated samples have shown that the suction is responsible for strength and cohesion improvement. Considering the theory of partially saturated porous soils of Coussy and Dangla (Me´canique des sols non sature´s (2002 edn). Herme`s Science: 2002; 390), we have proposed a constitutive law for partially saturated iron ore. The real increase in the apparent cohesion due to the capillary attraction forces is overestimated if the yield function is written in terms of effective stresses. The effect of the capillary cohesion has been modelled with a function in the expression of the apparent cohesion of the yield function. The effect of suction on the mechanical behaviour has been represented in the effective stresses space and in the total stresses space like the Alonso model (Ge´otechnique 1990; 40:405-430).

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Section: 24mentioning

confidence: 99%

“…Note that the Alonso model, as well as the model developed by Bourgeois et al [33], includes two distinct plastic mechanisms, namely stress-and suction-controlled plastic deformations. The last one is assumed to be a spherical tensor and is used to describe plastic compaction and swelling of material due to suction change under constant stress.…”

Section: 26mentioning

confidence: 99%

Effect of suction on the mechanical behaviour of iron ore rock

Grgic

Giot

Homand

et al. 2005

Num Anal Meth Geomechanics

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“…It will takes long time to reach saturated for concrete, and many achievements on study of mechanical behavior of unsaturated concrete have made at present. Bourgeois (2002) proposed the elastoplastic model for the effective mechanical properties of saturated and unsaturated rock as well as concrete based on the porous flexible theory of porous material, and analyzed the effects of different moisture content to the mechanical properties of concrete and rock [31]. Chatterji (2004) presented theoretical interpretation why concrete was in half-saturated or non-saturated in water [32].…”

Section: Meso-mechanical Analysis Methods Of Wet Concretementioning

confidence: 99%

Review of the study on macro-mechanical characteristics of wet concrete and their analysis methods

Liu¹

2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

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Abstract. Macro-mechanical properties of wet concrete are important for concrete structure design because the pore saturation in concrete has great influence on the mechanical properties of concrete. The research states of macro-mechanical characteristics of wet concrete were introduced in the filed of tests and meso-mechanical analysis methods. The test research achievements and application of meso-mechanical analysis methods on macro-mechanical characteristics of wet concrete were stated. The factors influencing the macro-mechanical characteristics of wet concrete were provided. Finally, the research trends on macro-mechanical properties of wet concrete in experiment and meso-mechanical analysis theory, as well as the problems to be solved are pointed out and prospected based on above.

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“…For the ventilation problem, the effective stress (28) is strongly different from (30). See also References [11,18,[22][23][24][25][26] for recent approaches to constitutive modelling of partially saturated soils and rocks. The recent works based on a micromechanical approach (see References [27][28][29]) seem to be a very promising way to discuss hypothesis such as effective stress because it allows some essential physical characteristics of the porous medium, such as morphology of the porous space and microstructure of the argillite to be taken into account.…”

Section: Hypotheses For Partially Saturated Porous Mediamentioning

confidence: 99%

Poroplastic modelling of the excavation and ventilation of a deep cavity

Hoxha¹,

Giraud²,

Blaisonneau

et al. 2004

Num Anal Meth Geomechanics

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SUMMARYA plastic deviatoric model with hardening is developed on the basis of geomechanical tests performed in the saturated case on low permeable porous material such as argillite. This model is a generalized MohrCoulomb plastic criterion combined with a Drucker-Prager plastic potential and the hardening parameter is the plastic distortion. Three different hardening functions have been introduced on the basis of triaxial tests: an increase of friction angle, a decrease of cohesion after a threshold and a contractancy to dilatancy transition for volumetric plastic strain. This plastic model has been adapted to the partially saturated case. The effective stress is expressed thanks to the equivalent interstitial pressure p: Numerical results are presented for the excavation and monotonous ventilation of a deep cylindrical cavity. A first plastification due to excavation is followed by a second one due to desaturation. The extent of the non-saturated zone provokes an extent of a plastic zone in the rock mass. Analysis shows that the origin of the plastification can be found in the deviatoric stresses because mean effective stresses are compressive during drying.

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An elastoplastic model for unsaturated rocks and concrete

Cited by 27 publications

References 7 publications

Effect of suction on the mechanical behaviour of iron ore rock

Effect of suction on the mechanical behaviour of iron ore rock

Review of the study on macro-mechanical characteristics of wet concrete and their analysis methods

Poroplastic modelling of the excavation and ventilation of a deep cavity

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