Influence of vibration amplitude on dynamic triggering of slip in sheared granular layers

Griffa, Michele; Ferdowsi, Behrooz; Guyer, R. A.; Daub, E. G.; Johnson, P. A.; Marone, Chris; Carmeliet, Jan

doi:10.1103/physreve.87.012205

Cited by 35 publications

(30 citation statements)

References 79 publications

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“…As mentioned before, the nonlinear Hertzian contact model for the particle interaction force is applied in the normal direction, and the tangential contact force is limited using the Coulomb friction law. The interparticle friction coefficient equals 0.1, which is somewhat smaller than that generally used in the literature for numerical simulations and material used in experiments [ Griffa et al ., ; Ferdowsi et al ., ; Scuderi et al ., ], but allows for larger slip events and reduces the frequency of small fluctuations in macroscopic friction signal [ Ferdowsi , ]. The employed friction coefficient is the same for dry and saturated models and therefore does not play a role in the comparison between dry and saturated models.…”

Section: Numerical Setupmentioning

confidence: 98%

“…The nature of stress accommodation and the dynamics of the stick‐slip events have been well studied in laboratory experiments and numerical simulations primarily on dry granular fault gouge [ Marone , , ; Morgan , ; Mair et al ., ; Guo and Morgan , ; Anthony and Marone , ; Johnson and Jia , ; Mair and Hazzard , ; Johnson et al ., ; Samuelson et al ., ; Johnson et al ., ; Johnson et al ., ]. Recent 3‐D discrete element method (DEM) numerical simulations of dry granular fault gouge demonstrate both spontaneous and triggered stick‐slip [ Ferdowsi et al ., ; Griffa et al ., ; Ferdowsi et al ., , ] similar to experiments. There exist a few studies of fluid‐saturated granular fault gouge as well.…”

Section: Introductionmentioning

confidence: 99%

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On the role of fluids in stick‐slip dynamics of saturated granular fault gouge using a coupled computational fluid dynamics‐discrete element approach

et al. 2017

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The presence of fault gouge has considerable influence on slip properties of tectonic faults and the physics of earthquake rupture. The presence of fluids within faults also plays a significant role in faulting and earthquake processes. In this paper, we present 3‐D discrete element simulations of dry and fluid‐saturated granular fault gouge and analyze the effect of fluids on stick‐slip behavior. Fluid flow is modeled using computational fluid dynamics based on the Navier‐Stokes equations for an incompressible fluid and modified to take into account the presence of particles. Analysis of a long time train of slip events shows that the (1) drop in shear stress, (2) compaction of granular layer, and (3) the kinetic energy release during slip all increase in magnitude in the presence of an incompressible fluid, compared to dry conditions. We also observe that on average, the recurrence interval between slip events is longer for fluid‐saturated granular fault gouge compared to the dry case. This observation is consistent with the occurrence of larger events in the presence of fluid. It is found that the increase in kinetic energy during slip events for saturated conditions can be attributed to the increased fluid flow during slip. Our observations emphasize the important role that fluid flow and fluid‐particle interactions play in tectonic fault zones and show in particular how discrete element method (DEM) models can help understand the hydromechanical processes that dictate fault slip.

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Section: Numerical Setupmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

On the role of fluids in stick‐slip dynamics of saturated granular fault gouge using a coupled computational fluid dynamics‐discrete element approach

et al. 2017

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“…Such instabilities are often observed in laboratory experiments [1][2][3][4][5][6][7][8][9]. At much larger scales, these instabilities may explain how aftershocks can be triggered by acoustic waves from earthquakes elsewhere [10][11][12][13][14][15]. In the context of industrial processing, stick-slip could result in structural damage and problems in mixing, causing major problems in the quality control of products [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Stick-slip instabilities in sheared granular flow: The role of friction and acoustic vibrations

et al. 2015

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We propose a theory of shear flow in dense granular materials. A key ingredient of the theory is an effective temperature that determines how the material responds to external driving forces such as shear stresses and vibrations. We show that, within our model, friction between grains produces stick-slip behavior at intermediate shear rates, even if the material is rate-strengthening at larger rates. In addition, externally generated acoustic vibrations alter the stick-slip amplitude, or suppress stick-slip altogether, depending on the pressure and shear rate. We construct a phase diagram that indicates the parameter regimes for which stick-slip occurs in the presence and absence of acoustic vibrations of a fixed amplitude and frequency. These results connect the microscopic physics to macroscopic dynamics, and thus produce useful information about a variety of granular phenomena including rupture and slip along earthquake faults, the remote triggering of instabilities, and the control of friction in material processing.

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“…The imposed velocity introduces a shear load to the granular system. A ramp protocol is employed for gradually increasing the shear velocity from 0 to V X,0 [22,23,24]. We identified different regions in the σ n − V X,0 parameter space where the system follows either a stick-slip dynamics or is in steady sliding mode.…”

Section: Model Descriptionmentioning

confidence: 99%

“…We recently investigated the role of boundary vibration on slip triggering by analyzing the affine and non-affine deformation fields ( [20,21]) inside the granular layer and their spatial-temporal evolution [22,23]. The vibration amplitude is shown to have significant influence on the size of triggered slip events in a 2D DEM model of a sheared granular layer [24].…”

Section: Introductionmentioning

confidence: 99%

Effect of boundary vibration on the frictional behavior of a dense sheared granular layer

et al. 2014

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We report results of 3D Discrete Element Method (DEM) simulations aiming at investigating the role of the boundary vibration in inducing frictional weakening in sheared granular layers. We study the role of different vibration amplitudes applied at various shear stress levels, for a granular layer in the stick-slip regime and in the steady-sliding regime. Results are reported in terms of friction drops and kinetic energy release associated with frictional weakening events. We find that larger vibration amplitude induces larger frictional weakening events. The results show evidence of a threshold below which no induced frictional weakening takes place. Friction drop size 2 is found to be dependent on the shear stress at the time of vibration. A significant increase in the ratio between the number of slipping contacts to the number of sticking contacts in the granular layer is observed for large vibration amplitudes. These vibration-induced contact rearrangements enhance particle mobilization and induces a friction drop and kinetic energy release. This observation provides some insight into the grain-scale mechanisms of frictional weakening by boundary vibration in a dense sheared granular layer. In addition to characterizing the basic physics of vibration induced shear weakening, we are attempting to understand how a fault fails in the earth under seismic wave forcing. This is the well know phenomenon of dynamic earthquake triggering. We believe that the granular physics are key to this understanding.

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Influence of vibration amplitude on dynamic triggering of slip in sheared granular layers

Cited by 35 publications

References 79 publications

On the role of fluids in stick‐slip dynamics of saturated granular fault gouge using a coupled computational fluid dynamics‐discrete element approach

On the role of fluids in stick‐slip dynamics of saturated granular fault gouge using a coupled computational fluid dynamics‐discrete element approach

Stick-slip instabilities in sheared granular flow: The role of friction and acoustic vibrations

Effect of boundary vibration on the frictional behavior of a dense sheared granular layer

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