Dependence of elastic properties of argillaceous rocks on moisture content investigated with optical full-field strain measurement techniques

Yang, Diansen; Bornert, Michel; Chanchole, S.; Gharbi, H.; Valli, P.; Gatmiri, Behrouz

doi:10.1016/j.ijrmms.2012.04.004

Cited by 60 publications

(54 citation statements)

References 24 publications

(49 reference statements)

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“…Although these papers develop elaborate constitutive laws, they provide very limited microstructural observations. The need for micromechanical observations was already recognised by Yang et al (2012) and Wang et al (2013Wang et al ( , 2015. From DIC applied to optical and environmental scanning electron microscope (ESEM) images, these authors showed how heterogeneous strain fields correlate with microstructure and recognised shear bands and tensile microcracks.…”

Section: Introductionmentioning

confidence: 99%

Deformation in cemented mudrock (Callovo–Oxfordian Clay) by microcracking, granular flow and phyllosilicate plasticity: insights from triaxial deformation, broad ion beam polishing and scanning electron microscopy

Desbois¹,

Höhne²,

Urai³

et al. 2017

Solid Earth

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Abstract. The macroscopic description of deformation and fluid flow in mudrocks can be improved by a better understanding of microphysical deformation mechanisms. Here we use a combination of scanning electron microscopy (SEM) and broad ion beam (BIB) polishing to study the evolution of microstructure in samples of triaxially deformed Callovo-Oxfordian Clay. Digital image correlation (DIC) was used to measure strain field in the samples and as a guide to select regions of interest in the sample for BIB-SEM analysis. Microstructures show evidence for dominantly cataclastic and minor crystal plastic mechanisms (intergranular, transgranular, intragranular cracking, grain rotation, clay particle bending) down to the nanometre scale. At low strain, the dilatant fabric contains individually recognisable open fractures, while at high strain the reworked clay gouge also contains broken non-clay grains and smaller pores than the undeformed material, resealing the initial fracture porosity.

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Section: Introductionmentioning

confidence: 99%

Deformation in cemented mudrock (Callovo–Oxfordian Clay) by microcracking, granular flow and phyllosilicate plasticity: insights from triaxial deformation, broad ion beam polishing and scanning electron microscopy

Desbois¹,

Höhne²,

Urai³

et al. 2017

Solid Earth

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“…e DICM was also used to test rock-like material cylinders [15][16][17][18] and blocks [19][20][21][22][23][24][25][26][27][28] in small scales. Dautriat et al [15,16] observed the deformation field evolution of limestone cylinders under different scales in compression experiment by the DICM.…”

Section: Introductionmentioning

confidence: 99%

Application of DICM on Similar Material Simulation Experiment for Rock-Like Materials

Kong

Wang

et al. 2018

Advances in Civil Engineering

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e digital image correlation method (DICM) has been applied to similar material simulation experiments for rock-like materials, to overcome the weakness of traditional measurements, for example, data discontinuous. In this paper, the movement and fracturing process of the overlying strata during excavation are observed and studied, and the distributions of stress, strain, and deformation in the overlying strata are obtained based on similar material simulation. e DICM is applied to improve the testing method and to optimize the discontinuity of testing points; of course, the difference of rock deformation in the overlying strata during excavation is considered. Full-field deformation and strain are analyzed by the DICM. To verify the accuracy of the DICM, results obtained from the DICM, numerical simulation and similar material simulation, are compared. e DICM can reflect the characteristics of locality and randomness of rock-like materials more real than numerical simulation, and comparing with similar material simulation, it can directly reproduce the movement and fracturing process of the overlying strata during full-field excavation. It shows that, the DICM is entirely feasible to using in the large scale full-field deformation measurement on complex rock structure, and it is of theoretical importance for testing for rock-like materials.

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“…Few studies exist in which the influence of cycles in RH on the drying-swelling characteristics of clay shales has been investigated (e.g. Grice, 1968;Van Eeckhout, 1976;Olivier, 1979;Pham et al, 2007;Farulla et al, 2010;Cardoso et al, 2011;Yang et al, 2012;Pineda et al, 2014). Grice (1968) noted that specimens of Utica shale that were immersed in water disintegrated completely after oven drying.…”

Section: Introductionmentioning

confidence: 99%

“…between 76 and 98 %) than for the same change at lower RH. Yang et al (2012) used digital image correlation techniques to study the deformation behaviour of Callovo-Oxfordian argillaceous rock specimens subjected to axial load (between 0.3 and 8.5 MPa) and RH cycles (between 39 and 85 %). A linear relationship between RH and strain has been observed for RH smaller than 75 %.…”

Section: Introductionmentioning

confidence: 99%

The response of Opalinus Clay when exposed to cyclic relative humidity variations

2017

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Abstract. Clay shale specimens were exposed to cyclic relative humidity (RH) variations to investigate the response of the material to natural environmental changes. Opalinus Clay, a clay shale chosen as host rock for nuclear waste disposal in Switzerland, was utilized. The specimens were exposed to stepwise relative humidity cycles in which they were alternately allowed to equilibrate at 66 and 93 % relative humidity. Principal strains were monitored throughout the experiments using strain gauges. After each relative humidity cycle, Brazilian tensile strength tests were performed to identify possible changes in tensile strength due to environmental degradation.Results showed that Opalinus Clay follows a cyclic swelling-shrinkage behaviour with irreversible expansion limited to the direction normal to bedding, suggesting that internal damage is restricted along the bedding planes. The Brazilian tensile strength in direction parallel and normal to bedding as well as the water retention characteristic remained unaffected by the RH variations.

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Dependence of elastic properties of argillaceous rocks on moisture content investigated with optical full-field strain measurement techniques

Cited by 60 publications

References 24 publications

Deformation in cemented mudrock (Callovo–Oxfordian Clay) by microcracking, granular flow and phyllosilicate plasticity: insights from triaxial deformation, broad ion beam polishing and scanning electron microscopy

Deformation in cemented mudrock (Callovo–Oxfordian Clay) by microcracking, granular flow and phyllosilicate plasticity: insights from triaxial deformation, broad ion beam polishing and scanning electron microscopy

Application of DICM on Similar Material Simulation Experiment for Rock-Like Materials

The response of Opalinus Clay when exposed to cyclic relative humidity variations

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