Fractals, Fault-Gouge, and Friction
1989; Linguagem: Inglês
10.1007/978-3-0348-6389-6_14
AutoresC. G. Sammis, Ronald L. Biegel,
Tópico(s)Landslides and related hazards
ResumoThe particle-size distribution of a natural fault-gauge has been determined over the range from 5 μm to 40 cm. The gouge is self-similar over the range from 5 μm to 1 cm having a fractal dimension of 2.60 ± 0.11. The lower and upper fractal limits were also determined. The lower fractal limit occurs at a dimension of about 1–10 μm where mineral cleavage and intergranular porosity dominate the cataclasis. The upper fractal limit occurs at particle sizes on the order of 1 cm where the scaled particle density decreases abruptly by a factor of about three. By analogy to soil-mechanics shear box tests and laboratory rock friction experiments, it is argued that the upper fractal limit of the gouge determines the characteristic displacement parameter in stick-slip friction models. A characteristic displacement on the order of 1 cm is consistent with estimates based on numerical simulations of faulting.
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