Microscopic Origin of Nonlocal Rheology in Dense Granular Materials

Gaume, Johan; Chambon, Guillaume; Naaïm, Mohamed

doi:10.1103/physrevlett.125.188001

Cited by 26 publications

(13 citation statements)

References 28 publications

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“…We further showed that in the quasi-static shearing regime (V ≲ 1 m/s, for a normal stress of 5 MPa), the fluctuating kinetic energy becomes nearly constant, which would suggest a nearly constant magnitude of the direct effect, consistent with most laboratory rock and gouge friction experiments (Bhattacharya et al, 2015;Kilgore et al, 1993). A nearly constant value of effective granular temperature in the quasi-static regime has also been previously reported in experimental granular physics studies (Corwin et al, 2005;Song et al, 2005), although more recent studies of granular systems with different loading geometries (i.e., other than tabular gouge layers between parallel plates) shows that this behavior could be influenced by localized deformation close to driving boundaries (Gaume et al, 2020;Kim & Kamrin, 2020;P. Richard et al, 2020).…”

Section: Energetics Of Granular Slide-holdssupporting

confidence: 86%

Slide‐Hold‐Slide Protocols and Frictional Healing in Discrete Element Method (DEM) Simulations of Granular Fault Gouge

Ferdowsi

Rubin

2021

JGR Solid Earth

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Section: Energetics Of Granular Slide-holdssupporting

confidence: 86%

Slide‐Hold‐Slide Protocols and Frictional Healing in Discrete Element Method (DEM) Simulations of Granular Fault Gouge

Ferdowsi

Rubin

2021

JGR Solid Earth

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“…Also, as shown recently in ref. [18] and [19], the granular temperature also plays a key role in determining the rheology of such systems and hence, along with µ and I, the granular temperature also needs to be considered,especially for the region where I > 0.03. Fig.…”

Section: Resultsmentioning

confidence: 99%

DEM simulations of quasi-two-dimensional flow of spherical particles on a heap without sidewalls

Ray

Khakhar

2021

EPJ Web Conf.

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Surface flows of granular materials find several important applications in both nature as well as industry. The effect of sidewalls on such flows is known to be large. Here, we study the rheology of such flows on a quasi two-dimensional heap without sidewalls, at different mass flow rates. It is seen that the surface angle of the heap, for all the mass flow rates, is the same and corresponds to the neutral angle. System variables such as the velocity, volume fraction and stresses are reported as a function of depth from the free surface of the heap. The friction coefficient and volume fraction are also studied as a function of the scaled local shear rate and these are also found to be independent of the mass flow rate. The behaviour observed in the present work is different from that reported in previous studies of surface flows with side walls.

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“…The observed difference hints the effect of terrain irregularity on the flow regime transition. Indeed, a more complex terrain can induce significant local velocity variations, leading to a different rheology (Gaume et al 2020 ). The avalanche simulated in case IV is apparently a plug flow as identified in the 2D modeling, which shares similarity with real avalanches in the warm plug regime.…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional and real-scale modeling of flow regimes in dense snow avalanches

Sovilla²,

Jiang

et al. 2021

Landslides

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Snow avalanches cause fatalities and economic loss worldwide and are one of the most dangerous gravitational hazards in mountainous regions. Various flow behaviors have been reported in snow avalanches, making them challenging to be thoroughly understood and mitigated. Existing popular numerical approaches for modeling snow avalanches predominantly adopt depth-averaged models, which are computationally efficient but fail to capture important features along the flow depth direction such as densification and granulation. This study applies a three-dimensional (3D) material point method (MPM) to explore snow avalanches in different regimes on a complex real terrain. Flow features of the snow avalanches from release to deposition are comprehensively characterized for identification of the different regimes. In particular, brittle and ductile fractures are identified in the different modeled avalanches shortly after their release. During the flow, the analysis of local snow density variation reveals that snow granulation requires an appropriate combination of snow fracture and compaction. In contrast, cohesionless granular flows and plug flows are mainly governed by expansion and compaction hardening, respectively. Distinct textures of avalanche deposits are characterized, including a smooth surface, rough surfaces with snow granules, as well as a surface showing compacting shear planes often reported in wet snow avalanche deposits. Finally, the MPM modeling is verified with a real snow avalanche that occurred at Vallée de la Sionne, Switzerland. The MPM framework has been proven as a promising numerical tool for exploring complex behavior of a wide range of snow avalanches in different regimes to better understand avalanche dynamics. In the future, this framework can be extended to study other types of gravitational mass movements such as rock/glacier avalanches and debris flows with implementation of modified constitutive laws.

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Microscopic Origin of Nonlocal Rheology in Dense Granular Materials

Cited by 26 publications

References 28 publications

Slide‐Hold‐Slide Protocols and Frictional Healing in Discrete Element Method (DEM) Simulations of Granular Fault Gouge

Slide‐Hold‐Slide Protocols and Frictional Healing in Discrete Element Method (DEM) Simulations of Granular Fault Gouge

DEM simulations of quasi-two-dimensional flow of spherical particles on a heap without sidewalls

Three-dimensional and real-scale modeling of flow regimes in dense snow avalanches

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