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Experimental study on damage characteristics of Beishan granite under single loading and multiple loading with AE
Zihui Wang1,2, Guanglei Zhou3,4, Xinbo Ge3,4
1State Key Laboratory of Mining Disaster Prevention and Control Cofounded By Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, Shandong, People's Republic of China. skd996340@sdust.edu.cn.
Scientific Reports
|May 30, 2023
Summary
Understanding host rock damage is crucial for high-level radioactive waste (HLW) disposal. Acoustic emission (AE) analysis reveals distinct damage patterns under single and multiple loading conditions in granite.
Area of Science:
- Geotechnical Engineering
- Materials Science
- Nuclear Waste Management
Background:
- Permanent disposal of high-level radioactive waste (HLW) necessitates a thorough understanding of host rock behavior.
- Granite is a common host rock candidate, and its damage characteristics under stress are critical for repository safety.
- Acoustic emission (AE) is a valuable technique for monitoring rock damage evolution in real-time.
Purpose of the Study:
- To investigate the damage characteristics of Beishan granite under single and multiple loading conditions.
- To analyze the evolution of damage using acoustic emission (AE) monitoring.
- To correlate AE signal parameters with different loading stages and stress levels.
Main Methods:
- Conducted single and multiple loading tests on Beishan granite specimens.
- Employed an acoustic emission (AE) monitoring system to capture damage-induced signals.
- Analyzed AE signal characteristics, including dominant frequency, amplitude, and b-values, in relation to stress and loading history.
Main Results:
- Single loading showed sustained high AE activity post-dilatancy, decreasing as peak stress approached.
- Multiple loading generated significant AE signals during elastic loading and unloading phases in failure/residual stages.
- AE waveforms typically had dominant frequencies < 200 kHz and amplitudes < 80 dB; amplitude correlated with stress.
- AE b-values indicated a complex relationship between micro- to macro-crack proportions and confining pressure.
- AE a- and b-values confirmed rapid micro-crack development and subsequent macro-crack formation in multiple loading scenarios.
Conclusions:
- Distinct AE signal patterns differentiate single and multiple loading damage evolution in granite.
- Unloading periods in multiple loading contribute significantly to AE activity, highlighting complex crack propagation.
- AE parameters, particularly b-values, provide insights into micro- and macro-crack development crucial for HLW repository design.
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