Damage evolution, acoustic emission and electromagnetic radiation of rock under uniaxial cyclic loading

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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Abstract

Uniaxial cyclic loading compression experiments are conducted with synchronous monitoring of acoustic emission (AE) and electromagnetic radiation (EMR). The AE and EMR characteristics of rocks during cyclic loading are analyzed. Subsequently, the Kaiser and Felicity effects of AE and EMR are disclosed. Moreover, the b-value and fractal dimension are calculated to explore the cracking mechanism of rock materials. These results show that the AE and EMR are active during the 1st and 2nd loading cycles, and sparse during the 3rd and 4th loading cycles where the AE and EMR are only generated when the stress exceeds the previous peak stress due to the Kaiser effect. In the 5th loading cycle, AE and EMR accelerate and peak at rock failure. The variation of EMR-based FR is consistent with that for AE under cyclic loading. Hence, the FR associated with EMR is also well correlated with stress memory. The AE and EMR-based FR is greater than 1 in the 2nd-4th loading cycles, and less than 1 in the 5th cycle, indicating that FR can be used to reflect the damage evolution of rocks. The b-value and fractal dimension increase in the 1st-4th loading cycles, and turn to decrease in the 5th loading cycle. This pattern serves as a precursor to identify the rock failure.

单轴循环加载下岩石的损伤演变、声发射和电磁辐射
通过同步监测声发射(AE)和电磁辐射(EMR),进行了单轴循环加载压缩实验。分析了循环加载期间岩石的声发射和电磁辐射特征。随后,揭示了 AE 和 EMR 的 Kaiser 和 Felicity 效应。此外,还计算了 b 值和分形维度,以探索岩石材料的开裂机理。这些结果表明,在第 1 和第 2 个加载周期,AE 和 EMR 比较活跃,而在第 3 和第 4 个加载周期,由于凯撒效应,AE 和 EMR 只在应力超过之前的峰值应力时才产生。在第 5 个加载周期,AE 和 EMR 加速产生,并在岩石破坏时达到峰值。基于 EMR 的 FR 变化与循环加载下 AE 的变化一致。因此,与 EMR 相关的 FR 也与应力记忆密切相关。基于 AE 和 EMR 的 FR 在第 2 至第 4 个加载循环中大于 1,而在第 5 个循环中小于 1,这表明 FR 可用来反映岩石的损伤演化。b 值和分形维数在第 1 至第 4 个加载循环中增加,在第 5 个加载循环中转为减少。这种模式是识别岩石破坏的先兆。
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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