Experimental study of the thermo-hydro-mechanical behaviour of indurated clays

Zhang, Chunliang; Rothfuchs, T.; Su, Kun; Hoteit, N.

doi:10.1016/j.pce.2006.04.038

Cited by 82 publications

(46 citation statements)

References 1 publication

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“…Changes in the degree of saturation are common in several engineering applications, including the drying and re-imbibition of host rock formations for waste repositories and the two-phase flow in shale gas reservoirs. Despite the recognised impact of suction on shale behaviour, few experimental tests have been carried out to evaluate the water retention properties of shales (e.g., Ramos da Silva et al 2008;Muñoz 2007;Zhang et al 2007). …”

Section: Water Retention Behaviourmentioning

confidence: 99%

Advances in the Testing of the Hydro-mechanical Behaviour of Shales

Ferrari

Laloui

2013

Springer Series in Geomechanics and Geoengineering

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Abstract. The paper presents some of the advanced experimental techniques and apparatuses that have been developed by the authors for testing the hydromechanical behaviour of shales. A methodology established for the analysis of the water retention behaviour in non-isochoric conditions is introduced; the method allows for the determination of the main drying and wetting paths in addition to the volume change response upon total suction variations. A high-pressure oedometric cell is then presented; the apparatus allows for the analysis of the transition from the pre-yield behaviour to the normally consolidated state. The analysis of the settlement versus time curves yields information on the permeability of the material as a function of the void ratio. The test results are illustrated for two Mesozoic shales from the northern region of Switzerland, namely, the Opalinus Clay from Mont Terri and the so called "Brown Dogger" from the Schlattingen site in the Molasse Basin.

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Section: Water Retention Behaviourmentioning

confidence: 99%

Advances in the Testing of the Hydro-mechanical Behaviour of Shales

Ferrari

Laloui

2013

Springer Series in Geomechanics and Geoengineering

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“…Muñoz [17] presented data on the evolution of the water content and the degree of saturation with total suction. Zhang et al [18] compared the water retention curves of Opalinus Clay shale in free and constrained volume conditions and discovered that there is a significant increase in the water amount that can be stored in the material when it is allowed to swell during the wetting phase. Villar and Romero [19] determined the retention curve for Opalinus Clay shale in terms of matric and total suction for free and confined volume conditions; they reported air entry values in the range of 9-21 MPa for free volume conditions and 15-35 MPa for confined conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the water retention behaviour of shales

Ferrari

Favero

Marschall

et al. 2014

International Journal of Rock Mechanics and Mining Sciences

104

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a b s t r a c tShales are among the most commonly considered geomaterials in current energy-related geomechanical investigations, as they are involved in engineering applications such as the extraction of natural gas, CO 2 sequestration and nuclear waste storage. A deep understanding of their behaviour with regard to variations in the degree of saturation is of significance for such applications. With the aim to establish a sound protocol for shale retention behaviour analysis, this paper presents an experimental methodology that takes into account the specificities of shales such as small pore size dimensions and the large variations in water potential to be applied to induce significant changes in the degree of saturation. The technique involves the direct control of the shale water content and the subsequent measurement of the suction at equilibrium by a psychrometer. A fluid displacement technique with a non-polar liquid is also used to assess the volume changes of the shale and to compute the degree of saturation. Selected test results are presented for various shale samples that have been cored at different depths. The results indicate that important features of the retention behaviour of geomaterials are fundamental aspects to be considered when analysing the retention behaviour of shales, such as the existence of main wetting and drying paths, the hysteresis domain, and the dependency of the air entry value on the void ratio.

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“…Hydrostatic and triaxial compression tests have been performed [11][12][13][14][15] to study the basic mechanical behavior of argillites. Typical stress-strain curves from triaxial compression tests have shown two basic phenomena on the overall mechanical responses of material (Figures 1 and 2): large residual strains in both axial and lateral directions after unloading of deviatoric stress and a progressive decrease in elastic stiffness during the unloading/reloading cycles.…”

Section: Introductionmentioning

confidence: 99%

Elastoplastic damage modeling of desaturation and resaturation in argillites

Jia

Bian

et al. 2009

Num Anal Meth Geomechanics

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SUMMARYThe development of a coupled elastoplastic damage constitutive model for argillites is presented. Emphasis is put on the description of post-failure and coupled hydromechanical behavior of argillites during the desaturation/resaturation processes. A short summary of experimental investigations is given in the first part, which shows an important plastic deformation coupled with damage and a significant influence of water content on the mechanical behavior of argillites. Based on the framework of poroplasticity and continuum damage mechanics, a general constitutive model is proposed for the poromechanical behavior of argillites in both saturated and unsaturated conditions. Main features observed in experiments are taken into account, in particular the elastic degradation due to microcracks, residual strength, coupling between plastic deformation and induced damage, influence of water content on plastic flow, variation of permeability induced by microcracks as well as the deformation generated in the desaturation/resaturation processes. The performance of the model is examined by comparing numerical simulations with test data in representative load paths. Finally, the model is applied to hydromechanical coupling study of four time-dependent tests subjected to a step change in relative humidity.

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Experimental study of the thermo-hydro-mechanical behaviour of indurated clays

Cited by 82 publications

References 1 publication

Advances in the Testing of the Hydro-mechanical Behaviour of Shales

Advances in the Testing of the Hydro-mechanical Behaviour of Shales

Experimental analysis of the water retention behaviour of shales

Elastoplastic damage modeling of desaturation and resaturation in argillites

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