Japan Geoscience Union Meeting 2015

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Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG59] Rheology, fracture and friction in Earth and planetary sciences

Wed. May 27, 2015 4:15 PM - 6:00 PM 106 (1F)

Convener:*Osamu Kuwano(Japan Agency for Marin-Earth Science and Technology), Tomohiro Ohuchi(Geodynamics Research Center, Ehime University), Ichiko Shimizu(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Hidemi Ishibashi(Graduate School of Science, Shizuoka University), Chair:Ichiko Shimizu(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo)

5:00 PM - 5:15 PM

[SCG59-04] Non-equilibrium thermodynamical interpretation for rate- and state-dependent friction law

*Noa MITSUI1, Peter V?an1, Takahiro HATANO2 (1.Wigner Research Centre for Physics, Hungarian Academy of Sciences, 2.Earthquake Research Institute, University of Tokyo)

Keywords:friction, constitutive law, non-equilibrium thermodynamics, evolution law

The rate- and state-dependent friction law is based on the experimental results of rock sliding friction. This law unifies two types of rock experiment results; the first one is the time dependence of static coefficient of friction (Dieterich, 1972) and the second one is slip velocity dependence of the dynamic coefficient of friction (Dieterich, 1978). This law is reproduced by using two equations called as constitutive law and evolution law.
Several versions of evolution law have been proposed in order to reproduce the experimental data better. However, none of them are completely satisfied.
We analyze this rate- and state-dependent friction law for the velocity-step and the healing tests from a thermodynamic point of view. Assuming a logarithmic deviation from steady-state, both results are reproduced. The proposed system of equations is a unification of the classical models (Dieterich, 1979; Ruina, 1983).