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2015 ; 5
(ä): 13455
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Granular friction: Triggering large events with small vibrations
#MMPMID26334133
Lastakowski H
; Géminard JC
; Vidal V
Sci Rep
2015[Sep]; 5
(ä): 13455
PMID26334133
show ga
Triggering large-scale motion by imposing vibrations to a system can be
encountered in many situations, from daily-life shaking of saltcellar to silo
unclogging or dynamic earthquakes triggering. In the well-known situation of
solid or granular friction, the acceleration of imposed vibrations has often been
proposed as the governing parameter for the transition between stick-slip motion
and continuous sliding. The threshold acceleration for the onset of continuous
slip motion or system unjamming is usually found of the order of the
gravitational acceleration. These conclusions are mostly drawn from numerical
studies. Here, we investigate, in the laboratory, granular friction by shearing a
layer of grains subjected to horizontal vibrations. We show that, in contrast
with previous results, the quantity that controls the frictional properties is
the characteristic velocity, and not the acceleration, of the imposed mechanical
vibrations. Thus, when the system is statically loaded, the typical acceleration
of the vibrations which trigger large slip events is much smaller than the
gravitational acceleration. These results may be relevant to understand dynamic
earthquake triggering by small ground perturbations.
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