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Acoustic Emission b Value Characteristics of Granite under True Triaxial Stress

Author

Listed:
  • Longjun Dong

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Lingyun Zhang

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Huini Liu

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Kun Du

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Xiling Liu

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

Abstract

The acoustic emission b value is an important and widely used parameter for the early prediction of rock fractures. In this study, five groups of true triaxial compression tests were conducted on granite specimens to analyze changes in b value during the process of rock failure, and to investigate the b value characteristics of acoustic emission events. First, the acoustic emission events that simultaneously triggered at least four sensors were located using P-wave arrivals and sensor coordinates. Then, considering various intervals of acoustic emission event counts, stress magnitude, and stress proportion, b values were calculated using the values of the maximum amplitude, average amplitude, maximum absolute energy, and average absolute energy of the acoustic emission events. In addition, the goodness of the fitting curves was used to evaluate the fitting reliability of the b values. The results indicated higher accuracy of b value when calculated using the average amplitude setting for intervals of acoustic emission event counts of 200 or greater, stress magnitude of 20 MPa or greater, and stress proportion of 10% or greater. Moreover, the interval of event counts of 200 is suggested as a window parameter for b value calculations, and the b values are observed to exhibit a decreasing trend before fracture for more than 80% of the specimens. Furthermore, the b value tends to decrease with an increase in confining pressure. Thus, the b value can be used as an indicator for validating the stress concentration area, including magnitudes and accumulative probability density distribution of events, which is a beneficial complement to clarifying precursor information of rock mass instability.

Suggested Citation

  • Longjun Dong & Lingyun Zhang & Huini Liu & Kun Du & Xiling Liu, 2022. "Acoustic Emission b Value Characteristics of Granite under True Triaxial Stress," Mathematics, MDPI, vol. 10(3), pages 1-16, January.
  • Handle: RePEc:gam:jmathe:v:10:y:2022:i:3:p:451-:d:738820
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    Citations

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    Cited by:

    1. Weiguang Ren & Chaosheng Wang & Yang Zhao & Dongjie Xue, 2023. "Research on Precursor Information of Brittle Rock Failure through Acoustic Emission," Mathematics, MDPI, vol. 11(19), pages 1-16, October.
    2. Changgen Xia & Daolong Chen & Wei He & Huini Liu & Xiling Liu, 2022. "Research on Maximum Likelihood b Value and Confidence Limits Estimation in Doubly Truncated Apparent Frequency–Amplitude Distribution in Rock Acoustic Emission Tests," Mathematics, MDPI, vol. 10(14), pages 1-13, July.
    3. Shaofeng Wang & Xin Cai & Jian Zhou & Zhengyang Song & Xiaofeng Li, 2022. "Analytical, Numerical and Big-Data-Based Methods in Deep Rock Mechanics," Mathematics, MDPI, vol. 10(18), pages 1-5, September.
    4. Daolong Chen & Changgen Xia & Huini Liu & Xiling Liu & Kun Du, 2022. "Research on b Value Estimation Based on Apparent Amplitude-Frequency Distribution in Rock Acoustic Emission Tests," Mathematics, MDPI, vol. 10(17), pages 1-17, September.
    5. Qinghe Zhang & Weiguo Li & Liang Yuan & Tianle Zheng & Zhiwei Liang & Xiaorui Wang, 2024. "A review of tunnel rockburst prediction methods based on static and dynamic indicators," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 120(12), pages 10465-10512, September.

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