The acoustoelastic effect on Rayleigh waves in elastic--plastic deformed layered rocks |
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Authors: | Liu Jin-Xi Cui Zhi-Wen and Wang Ke-Xie |
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Institution: | Department of Acoustics and Microwave Physics, School of Physics, Jilin University, JieFang Road 2519, Changchun 130021, China |
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Abstract: | On the basis of the acoustoelastic theory for elastic--plastic
materials, the influence of statically deformed states including both
the elastic and plastic deformations induced by applied uniaxial
stresses on the Rayleigh wave in layered rocks is investigated by
using a transfer matrix method. The acoustoelastic effects of
elastic--plastic strains in rocks caused by static deformations, are
discussed in detail. The Rayleigh-type and Sezawa modes exhibit
similar trends in acoustoelastic effect: the acoustoelastic effect
increasing rapidly with the frequency-thickness product and the phase
velocity change approaching a constant value for thick layer and high
frequency limit. Elastic--plastic deformations in the Castlegate
layered rock obviously modify the phase velocity of the Rayleigh wave
and the cutoff points for the Sezawa modes. The investigation may be
useful for seismic exploration, geotechnical engineering and
ultrasonic detection. |
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Keywords: | acoustoelastic Rayleigh wave elastic--plastic |
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