Dynamic instabilities under isotropic drained compression of idealized granular materials

Doanh, T.; Abdelmoula, Nouha; Gribaa, Lassad; Nguyen, Thi Thu Tra; Hans, Stéphane; Boutin, Claude; Bot, Alain Le

doi:10.1007/s11440-016-0514-0

Cited by 8 publications

(3 citation statements)

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“…2 ); and an equally fast reduction in due to the spontaneous outburst of pore fluid pressure occurring at constant solid fraction, followed by a slow recovery of . Since the cylindrical shape of the sample is preserved, these events are referred to as local stick-slip-like isotropic collapses 45 .…”

Section: Resultsmentioning

confidence: 99%

“…In a recent series of careful laboratory experiments using triaxial equipment, we detected, with a high level of confidence, a new spectrum of dynamic instabilities in saturated granular materials. These instabilities include unconventional observed behaviors such as irreversible damage in isotropic compression, termed isotropic collapse, up to the destruction of the granular skeleton, termed isotropic liquefaction 39 , 45 . In this paper, we extend the range of the observed spontaneous behaviors in triaxial compression and discover some new facets of stick-slip phenomena, including some of the largest laboratory earthquakes with the highest observed frictional stress drop to date and even, surprising, rare liquefaction during first stick-slip events under moderate stress loadings.…”

Section: Discussionmentioning

confidence: 99%

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High-temporal-resolution quasideterministic dynamics of granular stick-slip

Nguyen

Doanh

Bot

et al. 2021

Sci Rep

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We report high-temporal-resolution observations of the spontaneous instability of model granular materials under isotropic and triaxial compression in fully drained conditions during laboratory tests representative of earthquakes. Unlike in natural granular materials, in the model granular materials, during the first stage of the tests, i.e., isotropic compression, a series of local collapses of various amplitudes occurs under random triggering cell pressures. During the second stage, i.e., shearing under triaxial compression, the model granular samples exhibit very large quasiperiodic stick-slip motions at random deviatoric triggering stresses. These motions are responsible for very large stress drops that are described by power laws and are accurate over more than 3 decades in logarithmic space. Then, we identify the quasideterministic nature of these stick-slip events, assuming that they are fully controlled by the cell pressure and solid fraction. Finally, we discuss the potential mechanisms that could explain these intriguing behaviors and the possible links with natural earthquakes.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

High-temporal-resolution quasideterministic dynamics of granular stick-slip

Nguyen

Doanh

Bot

et al. 2021

Sci Rep

Self Cite

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show abstract

“…However, for larger strains, irreversible events occur that involve some dynamics (motion, rearrangement) of the particles. 23–28 In analysis of these events, in addition to classical measures (pressure, energy, coordination number), we find it insightful to consider explicitly also the force networks, describing the interparticle interactions on a scale between particles and system size. By now it is well accepted that the static and dynamic properties of these networks are closely related to mechanical properties of the whole granular sample; the examples include granular samples exposed to vibrations/tapping 29,30 or pullout of an intruder from a granular sample.…”

Section: Introductionmentioning

confidence: 99%