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Russian Geology and Geophysics

2003 year, number 7


E.B. Sibiryakov, V.A. Kulikov, and G.V. Egorov
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Microheterogeneity, microstructure, sand, elastic waves, mean number of grain contacts, mean grain size, attenuation, dry friction
Pages: 673-682


Seismic wave propagation in dry friable sands is described on the basis of a new approach by equations including grain interaction rather than the standard equation of state. If grains interact according to the Hertz law, one-dimensional propagation of shear waves in a channel with stiff walls is accompanied by secondary orthogonal motion described by a system of two related equations.
The theoretical results were tested by experiments in which physical parameters of sand were estimated from seismic data, P and S velocities were analyzed as a function of microstructure, and strain propagation in friable sand was measured for grains of different sizes.
The theoretical and experimental elastic constants of the medium showed good agreement.