Abstract
Using acoustic emission (AE) technique to locate the microcracking of rock samples in the process of rock mechanics test is one of the most effective means to study the spatio-temporal evolution of rock failure. At present, the research on AE source localization method for layered rock considering anisotropic P-wave velocity is insufficient and the location methods are usually two-dimensional. This paper first analyses the characteristics of P-wave velocity of layered rocks, and a method for establishing anisotropic P-wave velocity model of layered rocks is introduced. Then, a three-dimensional AE source localization method for layered rocks is proposed based on the anisotropic P-wave velocity model and simplex algorithm. The influences of iterative initial value, iterative contraction length, number of iterations and P-wave velocity measurement error on the positioning accuracy of this method are studied. And selection methods of those iterative parameters are introduced. Finally, the numerical analysis and true triaxial compression tests for quartz mica schist, quartz schist and black shale are conducted to verify the high location accuracy and efficiency of the proposed method. Numerical tests show that the average absolute distance errors of AE location results are less than 1 mm when the P-wave velocity measurement error is less than 5%, which is much less than that arising from use of the traditional simplex method. And the AE location results are consistent with the failure modes of the true triaxial compression test rock samples.
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The data that support the findings of this study are available from the corresponding author.
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Acknowledgements
This study was financially supported by the National Natural Science Foundation of China under Grant No. 52079027. The authors also thank Dr. Xu-feng Liu at Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, China, for his assistance in paper revision.
Funding
National Natural Science Foundation of China, 52079027, Yangyi Zhou.
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Song, T., Zhou, Y. & Yu, X. Three-dimensional acoustic emission source localization method for layered rock considering anisotropic P-wave velocity. Bull Eng Geol Environ 83, 185 (2024). https://doi.org/10.1007/s10064-024-03692-z
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DOI: https://doi.org/10.1007/s10064-024-03692-z