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- Title
Analysis of quality factors for Rayleigh channel waves.
- Authors
Yang, Xiao-Hui; Cao, Si-Yuan; Li, De-Chun; Yu, Peng-Fei; Zhang, Hao-Ran
- Abstract
To facilitate investigation of the effect of imperfect elastic dissipation on the propagation of Rayleigh-type channel waves and use of their quality factors in investigations of the properties of coal seams, a simple method for calculating the quality factor Q is proposed in this paper. Introduction of complex velocities into the dispersion function allows calculation of the dispersion function of Rayleigh-type channel waves in coal seams. By the control variable method, we analyzed changes in Q with changes in coal seam thickness and P- and S-wave Q-factors within the coal seam and adjacent rock layers. The numerical results show that the trend of the Q curve is consistent with the group velocity curve. The minimum Q value occurs at the Airy phase frequency; the Airy phase frequency decreases as coal seam thickness increases. The value of Q increases with increasing Q (quality factor for S wave in coal seam). We can compensate for the absorption of Rayleigh-type channel waves using the computed Q curve. Inversion of the Q curve can also be used to predict the thicknesses and lithologies of coal seams.
- Subjects
SEDIMENTS; RAYLEIGH waves; QUALITY factor; MATHEMATICAL functions; MATHEMATICAL variables; NUMERICAL analysis
- Publication
Applied Geophysics: Bulletin of Chinese Geophysical Society, 2014, Vol 11, Issue 1, p107
- ISSN
1672-7975
- Publication type
Article
- DOI
10.1007/s11770-014-0409-5