Shear-enhanced compaction band identification at the laboratory scale using acoustic and full-field methods

Charalampidou, Elli-Maria Christodoulos; Hall, Stephen A.; Stanchits, Sergei; Viggiani, Gioacchino; Lewis, Helen

doi:10.1016/j.ijrmms.2013.05.006

Cited by 42 publications

(21 citation statements)

References 39 publications

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“…The previous analysis in this paper indicates that the stress drops during discrete compaction band formation are larger compared to diffuse compaction bands. It can be confirmed by observing the experiments of other researches [2,20,22,[36][37][38][39][40]. So, the development of discrete compaction bands is more instable.…”

Section: Relationship Between Different Types Of Compaction Bandsmentioning

confidence: 57%

Experimental study on formation mechanism of compaction bands in weathered rocks with high porosity

Han

Liu

Wang

2013

Sci. China Technol. Sci.

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Since Mollema and Antonellini observed compaction bands in the field in 1996, different patterns of compaction bands have been found in laboratory experiments. There are some discrepancies between the laboratory experiments and the field observations: compared to the field observation, the stress levels required to induce compaction bands in laboratory experiments are usually higher than the inferred in the field, and the grain crushing are more intense in the laboratory experiments. In this paper, compaction bands were observed at the maximal principal stresses below 8 MPa, which is lower than the stress level inferred in the field, and there was no severe comminution inside the compaction bands. Experimental results indicate that the porosity and confining pressure have great impacts on the types of localization bands. Lower porosity and confining pressure can promote the growth of shear bands and high-angle shear bands. Higher porosity and confining pressure can promote the growth of discrete compaction bands. Intermediate porosity and confining pressure are favorable for the growth of hybrid modes involving two of the three, i.e., discrete compaction band, diffuse compaction band and high-angle shear band. The formation of discrete compaction bands is more unstable compared to diffuse compaction bands. The two types of compaction bands can appear in the same type rocks, and diffuse compaction bands are formed under lower confining pressure compared to discrete compaction bands. The reduction of permeability was within 2 orders of magnitude in this study, and it is 23 orders of magnitude lower than those obtained by other researchers. porous rock, compaction band, permeability evolution Citation:Han G F, Liu X L, Wang E Z. Experimental study on formation mechanism of compaction bands in weathered rocks with high porosity.

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Section: Relationship Between Different Types Of Compaction Bandsmentioning

confidence: 57%

Experimental study on formation mechanism of compaction bands in weathered rocks with high porosity

Han

Liu

Wang

2013

Sci. China Technol. Sci.

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“…However, creating a 3D volumetric speckle pattern is a much more complicated endeavor. One can either artificially introduce markers into the studied material (Huang et al, 2011), or just use the material's internal microstructure itself as the speckle pattern (Bay et al, 1999;Lenoir et al, 2007;Hall et al, 2010a, b;Charalampidou et al, 2011Charalampidou et al, , 2014. In this study, we use the natural microstructure of red sandstone as the volumetric speckle pattern.…”

Section: Discussionmentioning

confidence: 99%

“…Bay et al (1999) developed a 3D strain mapping technique using 3D digital image volume correlation, called digital volume correlation (DVC), and have measured displacement and strain fields in trabecular bones under compression. By combining in situ CT scanning and DVC, some studies have been carried out on a number of geomaterials, such as rocks (Lenoir et al, 2007;Charalampidou et al, 2011Charalampidou et al, , 2014 and granular materials (Hall et al, 2010a, b;Adam et al, 2013). In the DVC method, a cubic subset surrounding the interrogated point located in the reference volume image is selected and correlated with the corresponding location in the deformed volume image.…”

Section: Introductionmentioning

confidence: 99%

Full-field mapping of internal strain distribution in red sandstone specimen under compression using digital volumetric speckle photography and X-ray computed tomography

Mao

Zuo

Yuan

et al. 2015

Journal of Rock Mechanics and Geotechnical Engineering

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a b s t r a c tIt is always desirable to know the interior deformation pattern when a rock is subjected to mechanical load. Few experimental techniques exist that can represent full-field three-dimensional (3D) strain distribution inside a rock specimen. And yet it is crucial that this information is available for fully understanding the failure mechanism of rocks or other geomaterials. In this study, by using the newly developed digital volumetric speckle photography (DVSP) technique in conjunction with X-ray computed tomography (CT) and taking advantage of natural 3D speckles formed inside the rock due to material impurities and voids, we can probe the interior of a rock to map its deformation pattern under load and shed light on its failure mechanism. We apply this technique to the analysis of a red sandstone specimen under increasing uniaxial compressive load applied incrementally. The full-field 3D displacement fields are obtained in the specimen as a function of the load, from which both the volumetric and the deviatoric strain fields are calculated. Strain localization zones which lead to the eventual failure of the rock are identified. The results indicate that both shear and tension are contributing factors to the failure mechanism.

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“…Pore collapse and grain fragmentation are the main mechanisms associated with compaction band formation [63,64], and compactiontype events also dominate in shear banding [63] as well as in fracture zone formation (the polarity and focal mechanism analysis in Table S2 [37] gives 68% compaction-type events for sample Wgrn07 and even higher values for trigger and triggered events). Hence, our work proves conclusively that the occurrence of these empirical laws extends well beyond purely frictional sliding events, with potential applications in other types of crackling noise as well [65][66][67][68][69][70].…”

Section: Prl 119 068501 (2017) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Triggering Processes in Rock Fracture

et al. 2017

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We study triggering processes in triaxial compression experiments under a constant displacement rate on sandstone and granite samples using spatially located acoustic emission events and their focal mechanisms. We present strong evidence that event-event triggering plays an important role in the presence of large-scale or macrocopic imperfections, while such triggering is basically absent if no significant imperfections are present. In the former case, we recover all established empirical relations of aftershock seismicity including the Gutenberg-Richter relation, a modified version of the Omori-Utsu relation and the productivity relation-despite the fact that the activity is dominated by compaction-type events and triggering cascades have a swarmlike topology. For the Gutenberg-Richter relations, we find that the b value is smaller for triggered events compared to background events. Moreover, we show that triggered acoustic emission events have a focal mechanism much more similar to their associated trigger than expected by chance.

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Shear-enhanced compaction band identification at the laboratory scale using acoustic and full-field methods

Cited by 42 publications

References 39 publications

Experimental study on formation mechanism of compaction bands in weathered rocks with high porosity

Experimental study on formation mechanism of compaction bands in weathered rocks with high porosity

Full-field mapping of internal strain distribution in red sandstone specimen under compression using digital volumetric speckle photography and X-ray computed tomography

Triggering Processes in Rock Fracture

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