Statistics – Computation
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29s..22f&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 19, pp. 22-1, CiteID 1916, DOI 10.1029/2002GL015709
Statistics
Computation
8
Physical Properties Of Rocks: Fracture And Flow, Seismology: Earthquake Dynamics And Mechanics, Structural Geology: Fractures And Faults
Scientific paper
To match the boundary conditions of numerical models and to examine the effect of particle dimensionality on granular friction, we conducted laboratory experiments on rods sheared in 1-D and 2-D configurations, glass beads (3-D), and angular quartz sand (rough 3-D). The average coefficient of friction during stable sliding for 1-D, 2-D, smooth 3-D, and rough 3-D particles is 0.15, 0.3, 0.45, and 0.6, respectively. Frictional strength of 2-D layers exceeds 1-D friction by an amount associated with dilatancy and the additional contact plane in 2-D. We show that 3-D granular friction exceeds 2-D friction by the amount of interparticle friction on the out-of-plane particle contacts that do not exist in 2-D. Data from our 2-D experiments are remarkably similar to numerical results based on 2-D particle dynamic simulations. Our data indicate that application of numerical models of granular friction to tectonic faults will require computations involving rough, 3-D particles.
Frye Kevin M.
Marone Chris
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