Strain Localization in Sand: Plane Strain versus Triaxial Compression

Alshibli, Khalid A.; Batiste, Susan N.; Sture, Stein

doi:10.1061/(asce)1090-0241(2003)129:6(483)

Cited by 160 publications

(96 citation statements)

References 14 publications

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“…At small scale, numerous experimental studies performed on geomaterials are devoted to strain localisation which corresponds to the accumulation of large shear strain in limited zones (Vardoulakis et al 1978;Finno et al 1996;Finno et al 1997;Han and Drescher 1993;Alshibli et al 2003). They are mainly performed on biaxial apparatus and they involve special techniques, such as X-ray microtomography, three dimensional digital image correlation (Lenoir et al 2007) and stereophotogrammetry (Desrues and Viggiani 2004), to study the evolution of the strain localisation processes.…”

Section: Mechanical Fracturing and Excavation Damaged Zonementioning

confidence: 99%

Using Local Second Gradient Model and Shear Strain Localisation to Model the Excavation Damaged Zone in Unsaturated Claystone

2014

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The drilling of galleries induces damage propagation in the surrounding medium and creates, around them, the Excavation Damaged Zone, EDZ. The prediction of the extension and fracture structure of this zone remains a major issue especially in the context of underground nuclear waste storage. Experimental studies on geomaterials indicate that localised deformation in shear band mode usually appears prior to fractures. Thus, the excavation damaged zone can be modelled by considering the development of shear strain localisation bands. In the classical finite element framework, strain localisation suffers of a mesh-dependency problem. Therefore, an enhanced model with a regularisation method is required to correctly model the strain localisation behaviour. Among the existing methods, we choose the coupled local second gradient model. We extend it to unsaturated conditions and we include the solid grain compressibility. Furthermore, air ventilation inside underground galleries engenders a rock-atmosphere interaction that could influence the damaged zone. This interaction has to be investigated in order to predict the damaged zone behaviour. Finally, a hydro-mechanical modelling of a gallery excavation in claystone is presented and leads to a fairly good representation of the EDZ. The main objectives of this study are to model the fractures by considering shear strain localisation bands and to investigate if an isotropic model accurately reproduces the in situ measurements. The numerical results provide information about the damaged zone extension, structure and behaviour that are in very good agreement with in situ measurements and observations. For instance, the strain localisation bands develop in chevron pat-B. Pardoen * · S. Levasseur · F. Collin Université de Liège, Département ArGEnCo, Chemin des Chevreuils 1, 4000 Liège, Belgium Tel.: +32-4-3662033 E-mail: b.pardoen@ulg.ac.be * FRIA, F.R.S.-FNRS scholarship holder tern during the excavation and rock desaturation is observed close to the gallery due to air ventilation.

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Section: Mechanical Fracturing and Excavation Damaged Zonementioning

confidence: 99%

Using Local Second Gradient Model and Shear Strain Localisation to Model the Excavation Damaged Zone in Unsaturated Claystone

2014

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“…At small scale, plenty of laboratory tests on various geomaterials are dedicated to strain localisation (Vardoulakis et al, 1978;Han & Drescher, 1993;Finno et al, 1996Finno et al, , 1997Alshibli et al, 2003) and we will principally focus on plane-strain biaxial compression. At large scale, among various geotechnical problems, the process of 110 underground drilling which generates fractures in the surrounding medium will be investigated.…”

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Shear banding modelling in cross-anisotropic rocks

Pardoen

Seyedi²,

Collin

2015

International Journal of Solids and Structures

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Sedimentary geomaterials such as rocks frequently exhibit cross-anisotropic properties and their behaviour depends on the direction of loading with respect to their microstructure. As far as material rupture is concerned, localised deformation in shear band mode appears generally before cracks and material failure. cavation fractured zone that develops around a gallery is strongly influenced by the material anisotropy.

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“…However, it is certainly consistent with reduced dilation. Strain localisation, not readily discernible by the naked eye until a clear shear band develops (Alshibli et al, 2003;Rechenmacher, 2006), is evidenced by the relatively non-uniform patterns of displacement vectors and contours in the unreinforced (Figure 19a -c) and the lightly reinforced specimens (Figure 19d and e). The specimen having Vfr = 6.5 % did not exhibit localisation, as evidenced by the near-parallel displacement contour lines and more uniform displacement pattern (Figure 19f).…”

Section: Full Field Deformation Measurementsmentioning

confidence: 99%

A behavioural framework for fibre-reinforced gravel

et al. 2017

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The mechanical behaviour of granular materials is known to be influenced by the addition of fibres. However, most previous research has been carried out on materials with relatively small grains (sands), and its application to larger grains is not well documented. This paper reports an investigation into the mechanical behaviour of a fibre reinforced granular material having a relatively large grain size corresponding to 1/3 rd and 1/5 th scaled railway ballast. The investigation was carried out by means of triaxial tests incorporating a fullfield, image-based deformation measurement technique; this enabled detailed observations to be made of each triaxial test specimen during shearing. The test data demonstrate the benefits of random fibre reinforcement for aggregates having a relatively large grain size. Analysis taking into account the effect of fibre tension on the effective stresses experienced by the granular skeleton provides new insights into the mechanisms of reinforcement in larger sized granular materials.

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Strain Localization in Sand: Plane Strain versus Triaxial Compression

Cited by 160 publications

References 14 publications

Using Local Second Gradient Model and Shear Strain Localisation to Model the Excavation Damaged Zone in Unsaturated Claystone

Using Local Second Gradient Model and Shear Strain Localisation to Model the Excavation Damaged Zone in Unsaturated Claystone

Shear banding modelling in cross-anisotropic rocks

A behavioural framework for fibre-reinforced gravel

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