基于显微CT的泥岩单轴压缩破坏特征的声发射表征

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摘要研制了基于实时声发射采集和实时加载CT扫描同步进行的加载控制系统，组建了对岩石损伤、破坏过程进行声发射表征的实验系统和实验方法。研究表明：①在峰值载荷28%前，原生裂纹宽度基本无变化，而后经历先变窄再变宽的过程。在峰值载荷47%前，原生裂纹长度基本无变化，而后开始增长，原生裂纹在宽度上先进行扩展从而引起原生裂纹在长度上的增长；②在峰值载荷65%前，裂纹的延伸发生在裂纹尖端的软弱介质中，而后才是真正的原生裂纹起裂，并快速延伸扩展；③新生裂纹易产生在软硬夹层交界处，新生裂纹产生时的载荷约为峰值载荷的56%~75%，在峰值载荷84%前，裂纹处于稳定扩展阶段，三条裂纹同时各自发展；④裂纹宽度变大、原生裂纹在其尖端软弱介质中延伸、软硬交界处新生裂纹的产生过程中声发射较少，当这些过程连在一起时，便形成了声发射平静期；⑤建立了岩石孔隙率、裂纹长度和宽度与声发射能量、振铃计数之间的表征方程，并提出不同加载阶段岩石状态评价的判据。

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	段东1
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	赵钰铤1
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	张睿哲1
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	赵凯雷1
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关键词 ：实时加载, 显微CT扫描, 裂纹演化过程, 声发射表征, 评价判据

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.

Key words： real-time loading Micro-CT scanning crack evolution process acoustic emission characterization evaluation criteria

收稿日期: 2019-09-02 出版日期: 2020-08-15

引用本文:

段东1,2，赵钰铤1,2，张睿哲1,2，赵凯雷1,2. 基于显微CT的泥岩单轴压缩破坏特征的声发射表征[J]. 振动与冲击, 2020, 39(16): 163-170.
DUAN Dong1,2,ZHAO Yuting1,2,ZHANG Ruizhe1,2,ZHAO Kailei1,2. Acoustic emission characterization of uniaxial compression failure characteristics of mudstone based on Micro-CT. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(16): 163-170.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I16/163

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