Numerical investigation of fracture interface waves
作者:
Boliang Gu,
Kurt T. Nihei,
Larry R. Myer,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1997)
卷期:
Volume 102,
issue 1
页码: 120-127
ISSN:0001-4966
年代: 1997
DOI:10.1121/1.419769
出版商: Acoustical Society of America
关键词: ROCKS;CONCRETES;FRACTURE MECHANICS;WAVE PROPAGATION;INTERFACES;SIMULATION;RAYLEIGH WAVES;SHEAR
数据来源: AIP
摘要:
Two-dimensional boundary element simulations are conducted to investigate the properties of Rayleigh-type fracture interface waves generated by a line source located near a single fracture. The fracture is modeled as a displacement–discontinuity boundary condition between two elastic half-spaces with identical properties. Numerical simulations are performed for different fracture stiffnesses, source polarizations, and source depths. Symmetric and antisymmetric fracture interface waves are observed with amplitudes and velocities that are controlled by the ratio of the fracture impedance to the half-space shear wave impedance, as predicted by plane-wave theory [Gu et al., J. Geophys. Res.101, 827–835 (1996); Pyrak-Nolte and Cook, Geophys. Res. Lett.14, 1107–1110 (1987)]. When the source is located off the fracture, these waves develop at incidence angles that decrease with source depth.
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