Localized deformation in intensely fissured clays studied by 2D digital image correlation

Vitone, Claudia; Viggiani, Gioacchino; Cotecchia, Federica; Hall, Stephen A.

doi:10.1007/s11440-013-0208-9

Cited by 36 publications

(20 citation statements)

References 21 publications

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“…The natural micro-to meso-structure of natural fissured and unfissured clays has been dealt with as an internal state variable adding to void ratio in controlling the clay response (e.g., Leroueil 1988;Burland 1990;Leroueil and Vaughan 1990;Nagaraj et al 1998;Cotecchia and Chandler 2000;Vitone and Cotecchia 2011;Vitone et al 2013a;b). It has been found that, if unfissured, the natural structure (i.e., the combination of fabric and bonding) makes the clay enter the structure permitted space as recalled by Leroueil and Vaughan (1990), so that, at the same consolidation pressure, the natural unfissured clay can be stable at higher water content than the same clay when reconstituted in the laboratory (Fig.…”

Section: Behavioural Trends In Compression Of the Treated Claysmentioning

confidence: 99%

On the mechanical behaviour of dredged submarine clayey sediments stabilized with lime or cement

2015

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The paper presents the preliminary results of experimental research into the stabilisation with cement and/or lime of clayey sediments dredged from the Port of Taranto (Italy). First, the physical properties of the natural sediments are briefly described and compared with those of the same sediments when treated with different additives and cured up to four years. In particular, the effect of the treatment on the soil plasticity properties is originally analysed in terms of plasticity paths.Then, the influence of the different stabilising agents on the compression behaviour of the dredged soil is analysed and methods for quickly predicting the admixed-soil behaviour are presented.

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Section: Behavioural Trends In Compression Of the Treated Claysmentioning

confidence: 99%

On the mechanical behaviour of dredged submarine clayey sediments stabilized with lime or cement

2015

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“…Vitone et al (2013) observed that pre-existing fissures play an important role in the strain localisation while shearing samples of scaly clay in a plane strain apparatus. Vitone & Cotecchia (2011) introduced a fissuring characterisation chart, in order to classify and evaluate the fissuring identity (F-ID) of the fissured clays with respect to those features that affect their mechanical behaviour, such as intensity (I) and orientation (F) of fissures.…”

Section: Introductionmentioning

confidence: 98%

The inter-scale behaviour of two natural scaly clays

Nardelli

Coop

Vitone

et al. 2016

Géotechnique Letters

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This paper describes the results of an experimental investigation of the inter-scale behaviour of two natural scaly clays. These have been tested by means of a custom-made inter-particle loading apparatus, which has enabled their mechanical response to be studied in both compression and shearing. The main features of the micromechanical behaviour of these clays have been compared, focusing on the influence of their composition, and the results are compared with those obtained testing the same materials using other devices (triaxial and ring shear apparatus). The results have shown that, contrary to expectations, the surfaces of the scales are not residual shear surfaces and the inter-scale angle of shearing resistance is actually closer to critical state or post-peak angles measured in conventional tests.

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“…In particular, the fissures are organized into a peculiar intense network that splits the clay into millimetre lens-shaped elements (known as scales -which is the origin of their being referred to as scaly clays in the literature). This paper reports a further step of a long lasting experimental research, which entails the experimental investigation of the geomechanical properties of several differently fissured clays, aiming at their modelling as a single class of geomaterials [8][9][10][11][12][13]. During previous laboratory studies, the SCM scaly clay [9][10][11] were tested in plane strain compression tests at zero confining pressure in the plane of deformation.…”

Section: Introductionmentioning

confidence: 99%

“…This paper reports a further step of a long lasting experimental research, which entails the experimental investigation of the geomechanical properties of several differently fissured clays, aiming at their modelling as a single class of geomaterials [8][9][10][11][12][13]. During previous laboratory studies, the SCM scaly clay [9][10][11] were tested in plane strain compression tests at zero confining pressure in the plane of deformation. The experiments have shown that, when the fissure orientation in the specimen is either random or horizontal, i.e., normal to the direction of the maximum principal stress, the development of localized deformation throughout plane strain compression tests, is not dictated by pre-existing fissures.…”

Section: Introductionmentioning

confidence: 99%

Influence of fissure inclination and confining pressure on the local behaviour of natural clays

et al. 2019

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In this experimental study the influence of fissuring orientation and confinement pressure on the mechanical behaviour of natural clays is investigated. The tested material, the scaly clay from Santa Croce di Magliano (south of Italy), is characterised by an intense network of pre-existing fissures of single orientation. Several plane strain compression tests have been conducted, under different confinement pressures (i.e., from 50 to 600 kPa), on specimens having fissures with vertical, medium and horizontal inclination. Digital Image Correlation has been used to follow the deformation processes of the specimens throughout the tests by measuring incremental shear and volumetric strain maps. The results showed a strong coupling between the total confinement and the fissure inclination, that is controlling both the onset and the development of the patterns of the localisation processes. The new results have been compared with previous ones carried out on the same material without confinement. The comparison shed light on the role of total confinement that becomes particularly relevant from certain levels of pressures and fissuring inclination.

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Localized deformation in intensely fissured clays studied by 2D digital image correlation

Cited by 36 publications

References 21 publications

On the mechanical behaviour of dredged submarine clayey sediments stabilized with lime or cement

On the mechanical behaviour of dredged submarine clayey sediments stabilized with lime or cement

The inter-scale behaviour of two natural scaly clays

Influence of fissure inclination and confining pressure on the local behaviour of natural clays

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