岩石微破裂震源参数反演高保真声发射传感器研制、校准与应用

doi:10.3724/1000-6915.jrme.2025.0447

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Abstract High-frequency acoustic emission (AE) signals generated during rock microcracking contain essential source parameters—such as moment magnitude, source radius, and stress drop—that characterize the underlying rupture process. To facilitate their quantitative inversion, this study develops and calibrates a broadband, high-fidelity AE sensor, AcouSeek, which exhibits a flat displacement response across the frequency range of 10 to 1000 kHz. Two standard sources—steel ball impact and capillary glass rupture—are employed to establish an absolute calibration methodology, grounded in Hertzian contact theory and a step-loading model, respectively. In a three-point bending test with controlled crack opening, 24 AcouSeek sensors are utilized to record AE signals. A total of 561 microcracking events are analyzed through displacement-based spectral fitting and physical source models, resulting in moment magnitudes ranging from –8.6 to –7.2, source radii between 1.6 and 2.9 mm, and stress drops between 30 and 82 kPa. The obtained parameters are consistent with those reported for mining-induced and natural earthquakes, demonstrating cross-scale compatibility. This study establishes a comprehensive workflow—from broadband sensing to absolute calibration and source parameter inversion—providing a standardized and extensible approach for integrating laboratory AE studies into the framework of quantitative seismology.

Key words： rock mechanica acoustic emission sensor response absolute calibration moment magnitude stress drop source parameter inversion

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	Articles by authors
	WU Rui1
	2
	GAO Fuqiang1
	2
	DONG Shuangyong1
	2
	PENG Xiangyuan1
	2
	ZHAO Chenxi1
	2

Cite this article:

WU Rui1,2,GAO Fuqiang1, et al. Development, calibration and application of high-fidelity acoustic emission sensors for source parameter inversion during rock microcracking[J]. , 2026, 45(4): 1079-1094.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0447 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I4/1079

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