Preavalanche Instabilities in a Granular Pile

Staron, Lydie; Vilotte, J. P.; Radjaï, Farhang

doi:10.1103/physrevlett.89.204302

Cited by 97 publications

(109 citation statements)

References 12 publications

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“…One can wonder if these collapse events are directly or indirectly related to the pre-avalanche precursors which have been previously studied [5][6][7][8][9]. Kabla et al…”

Section: Discussionmentioning

confidence: 99%

“…Note that even if the solid volume fraction is used as a control parameter it reflects only partially the complexity of the granular microstructure from which originate the local mechanisms responsible for the micro-failures described in [5][6][7][8][9]. Other quantities should be more relevant than the solid volume fraction as for instance the dilatancy angle [12,23] or the mean coordination number.…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

“…-The first category has revealed occurrence of pre-avalanche precursors due to intermittent collective grains rearrangements whose mean size and frequency progressively increase as the granular slope approaches the stability limit [5][6][7][8][9].…”

mentioning

confidence: 99%

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Sensitivity to solid volume fraction of gravitational instability in a granular medium

Bonnet¹,

Richard²,

Philippe³

2010

Granular Matter

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We report experimental results on incipient dynamics of gravitational destabilization in an immersed granular medium. Two protocols have been used to reach instability: a progressive loading and a dam-break situation. The instability triggering, analyzed by high-speed imaging and CIV post-processing, reveals distinct dynamical behaviours depending on the initial packing fraction of the medium. Two destabilisation modes have been observed: a surface avalanche and a deeper phenomenon that we called circular collapse.

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“…One can wonder if these collapse events are directly or indirectly related to the pre-avalanche precursors which have been previously studied [5][6][7][8][9]. Kabla et al…”

Section: Discussionmentioning

confidence: 99%

Section: Conclusion and Prospectsmentioning

confidence: 99%

See 1 more Smart Citation

Sensitivity to solid volume fraction of gravitational instability in a granular medium

Bonnet¹,

Richard²,

Philippe³

2010

Granular Matter

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“…In CD, an iterative algorithm based on nonlinear Gauss-Seidel iterations is used to determine the contact forces and particle velocities simultaneously at all potential contacts. The CD method has been extensively employed for the simulation of granular materials in 2D and 3D [55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72].…”

Section: Bonded Cell Modelmentioning

confidence: 99%

Bonded-cell model for particle fracture

et al. 2015

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Particle degradation and fracture play an important role in natural granular flows and in many applications of granular materials. We analyze the fracture properties of two-dimensional disklike particles modeled as aggregates of rigid cells bonded along their sides by a cohesive Mohr-Coulomb law and simulated by the contact dynamics method. We show that the compressive strength scales with tensile strength between cells but depends also on the friction coefficient and a parameter describing cell shape distribution. The statistical scatter of compressive strength is well described by the Weibull distribution function with a shape parameter varying from 6 to 10 depending on cell shape distribution. We show that this distribution may be understood in terms of percolating critical intercellular contacts. We propose a random-walk model of critical contacts that leads to particle size dependence of the compressive strength in good agreement with our simulation data.

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“…Important non equilibrium effects of structurally disordered granular systems, beside the slow relaxation to equilibrium [12,22,23], are : bistability and hysteresis [24,25,26] as the result of a memory effect due to the internal history dependence of systems out of equilibrium and the lack of an unique metastable state [2] ; and a jerky response to the external driving force with impulselike events (local rearrangements of grains or avalanches), as the result of the exploration of local minimal energy configurations [27,28]. A related important question is whether a diverging length-scale exists on the jammed side of the transition [29].…”

Section: Introductionmentioning

confidence: 99%

Memory of the unjamming transition during cyclic tiltings of a granular pile

et al. 2005

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Discrete numerical simulations are performed to study the evolution of the micro-structure and the response of a granular packing during successive loading-unloading cycles, consisting of quasi-static rotations in the gravity field between opposite inclination angles. We show that internal variables, e.g., stress and fabric of the pile, exhibit hysteresis during these cycles due to the exploration of different metastable configurations. Interestingly, the hysteretic behaviour of the pile strongly depends on the maximal inclination of the cycles, giving evidence of the irreversible modifications of the pile state occurring close to the unjamming transition. More specifically, we show that for cycles with maximal inclination larger than the repose angle, the weak contact network carries the memory of the unjamming transition. These results demonstrate the relevance of a two-phases description -strong and weak contact networks-for a granular system, as soon as it has approached the unjamming transition.

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Preavalanche Instabilities in a Granular Pile

Cited by 97 publications

References 12 publications

Sensitivity to solid volume fraction of gravitational instability in a granular medium

Sensitivity to solid volume fraction of gravitational instability in a granular medium

Bonded-cell model for particle fracture

Memory of the unjamming transition during cyclic tiltings of a granular pile

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