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| Acoustic emission characterization of uniaxial compression failure characteristics of mudstone based on Micro-CT |
| DUAN Dong1,2,ZHAO Yuting1,2,ZHANG Ruizhe1,2,ZHAO Kailei1,2 |
1.College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2.Key Laboratory of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China |
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Abstract A loading control system based on real-time acoustic emission acquisition and real-time loading CT scanning synchronization was developed.The experimental system and experimental method for acoustic emission characterization of rock damage and destruction process were constructed.The research shows that: ① Before 28% of the peak load, the width of the primary crack is basically unchanged, and then the process is narrowed and then widened.Before 47% of the peak load, the length of the primary crack does not change substantially, and then begins to grow, the primary crack first expands in width to cause the growth of the primary crack in length.② Before 65% of the peak load, the extension of the crack occurs in the weak medium at the crack tip, and then the true primary crack starts and spreads rapidly.③ New cracks are likely to occur at the junction of soft and hard interlayers, and the load at the time of new crack generation is about 56% to 75% of the peak load.Before 84% of the peak load, the crack is in a stable expansion phase, and the three cracks develop at the same time.④ The crack width becomes larger, the primary crack extends in the weak medium of the tip, and the acoustic emission is less during the generation of the new crack at the soft and hard junction.When these processes are connected together, the acoustic emission calm period is formed.⑤ The characterization equations between rock porosity, crack length and width, acoustic emission energy and ringing count are established, and the criteria for rock state evaluation in different loading stages are proposed.
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Received: 02 September 2019
Published: 15 August 2020
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