A composite rate- and state-dependent law for rock friction

Details A composite rate- and state-dependent law for rock friction A composite rate- and state-dependent law for rock friction

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1103k&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 6, p. 1103-1106

Physics

19

Physical Properties Of Rocks: Fracture And Flow, Seismology: Earthquake Dynamics And Mechanics

Scientific paper

Existing constitutive laws of rock friction cannot describe both observed strengthening in the absence of slip and frictional behavior around steady-state sliding. Combining existing rate- and state-dependent friction laws, we propose a new friction law, which expresses logarithmically time-dependent healing at sliding velocities smaller than a cut-off velocity Vc and approaches the so-called slip law at velocities larger than Vc. Numerical simulations show that the new friction law adequately explains experimental results of velocity stepping tests and slide-hold-slide tests, which have widely been used to examine velocity-, time-, and displacement-dependent property of rock friction. Because the new friction law has a simple form and appears appropriate for a wide range of conditions, it is useful for application to numerical modeling of seismic cycles.

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