Hao Tianxuan, Wang Guoqing, Li Fan, Tang Yiju, Yuan Meiqi
College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, Henan, China.
Collaborative Innovation Center of Coal Work Safety and Clean High-Efficiency Utilization, Jiaozuo, 454000, Henan, China.
Sci Rep. 2024 Oct 27;14(1):25661. doi: 10.1038/s41598-024-77170-7.
The instability and failure processes of coal-rock combinations are accompanied by the release of acoustic emission (AE) and infrared radiation (IR) signals. To investigate the characteristics of AE and IR signals during the failure process in coal-rock combinations with different ratios, and to analyze the effectiveness and applicability of the monitoring methods for these two signals in various specimen ratios. In this paper, the uniaxial compression tests were conducted on seven coal-rock combinations with different ratios by using the rock mechanics loading system and the cooperative monitoring platform of infrared and acoustic emission. The results show that (1) the AE counts for failure precursors in coal-rock combinations are positively correlated with the coal-rock ratio, whereas the AE peak counts are negatively correlated. Moreover, as the coal-rock ratio decreases, the slope of the cumulative AE count curve during the peak failure stage approaches 1. (2) During the elastic and yield stages, the maximum infrared radiation temperature (MIRT) curve fluctuates, and just before peak failure, the curve displays a distinctive "V" shape. This "V" shape becomes more pronounced as the coal-rock ratio decreases. (3) In the monitoring of damage precursors of coal-rock combinations, when the ratio of coal to rock is 1:3 or less, IR monitoring is better than AE monitoring. Conversely, when the ratio of coal to rock is greater than 1:3, AE monitoring is more suitable. Consequently, the combined monitoring of AE and IR signals can increase the reliability and precision of early warning signals for coal-rock assemblage damage precursors.
煤岩组合体的失稳破坏过程伴随着声发射（AE）和红外辐射（IR）信号的释放。为了研究不同配比煤岩组合体破坏过程中AE和IR信号的特征，分析这两种信号监测方法在不同试件配比中的有效性和适用性。本文利用岩石力学加载系统以及红外与声发射协同监测平台，对7种不同配比的煤岩组合体进行了单轴压缩试验。结果表明：（1）煤岩组合体破坏前兆的AE计数与煤岩比呈正相关，而AE峰值计数呈负相关。此外，随着煤岩比减小，峰值破坏阶段累积AE计数曲线的斜率趋近于1。（2）在弹性和屈服阶段，最大红外辐射温度（MIRT）曲线波动，在峰值破坏前，曲线呈现出独特的“V”形。随着煤岩比减小，这种“V”形变得更加明显。（3）在煤岩组合体损伤前兆监测中，当煤岩比为1:3及以下时，IR监测优于AE监测。相反，当煤岩比大于1:3时，AE监测更合适。因此，AE和IR信号的联合监测可以提高煤岩组合体损伤前兆预警信号的可靠性和精度。
