Study on Gradual Fracture of Rock and Key Precursor Information before Peak Stress Based on AE Monitoring under True Triaxial Loading
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 1
Abstract
The deep surrounding rock under true triaxial stress is easy to break at the new excavation face, which will induce engineering disasters to threaten personnel and equipment. Many studies have shown that the intermediate principal stress (IPS) has a great influence on rock failure. To accurately understand the influence of IPS on the gradual failure mechanism of the new excavation face under true triaxial stress and extract the key precursor information of rock failure, this study is based on true triaxial tests of acoustic emission (AE) monitoring, which provides a creative explanation to the phenomenon that sometimes the sudden increase of the AE counts rate (ACR) and the energy release rate (ERR) changes asynchronously. This paper analyzes the influence of IPS on the crack type in the failure process, studies the transitional behavior and gradual evolution of AE dominant frequency, and presents the precursor information index for rock failure. The results show that the sudden increase times of ACR and ERR under different IPS values are different. The rock under lower IPS is prone to produce intergranular fracture with low energy consumption, while the rock under higher IPS is prone to produce transgranular fracture with high energy consumption. Near the peak stress, the dominant frequency at lower IPS shows obvious downward transitional behavior, and the dominant frequency under higher IPS presents downward and upward transitional behavior. This study verified that can be used as the key precursor information for predicting rock failure.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research was supported by the Joint Program between National Natural Science Foundation of China and Shandong Province (U1806209) and Fundamental Research Funds for the Central Universities (TP-19-021A3 and FRF-IDRY-19-002).
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Journal of Materials in Civil Engineering
Volume 34 • Issue 1 • January 2022
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© 2021 American Society of Civil Engineers.
History
Received: Jan 23, 2021
Accepted: May 13, 2021
Published online: Oct 25, 2021
Published in print: Jan 1, 2022
Discussion open until: Mar 25, 2022
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