Li Bo, Shi Zhen, Jiang Mengsheng, Zhang Junxiang, Li Li
College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, China.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo, 454003, Henan, China.
Sci Rep. 2024 Jun 18;14(1):14055. doi: 10.1038/s41598-024-65029-w.
To investigate the characteristics of destabilization damage in coal-rock complexes. Mechanical property tests were conducted on coal, rock, and their complexes. An infrared thermal camera was employed to real-time monitor the infrared (IR) radiation response signals during the destabilization damage process. A numerical model of coal-rock destabilization damage was developed, and its validity was verified. Deformed stress fields and displacement contours were obtained during the destabilization damage process. Upon destabilization, numerous cracks form at the base of the "coal" section, extending towards the interface, resulting in the formation of a wave-like deformation region. The differentiation in infrared thermal images is more pronounced in the "coal" section compared to the "rock" section. A high-stress region is evident at the interface, resulting in an area of high stress differentials. However, the bottom of the "coal" section also exhibits a region with high stress differentials and a more pronounced tendency towards destabilization damage. Displacement contours revealed that numerous units at the bottom of the "coal" section had slipped and misaligned, leading to the accumulation of damage and an elevation in the local damage level. It is a crucial factor contributing to the notable phenomenon of IR thermal image differentiation.
为研究煤岩复合体失稳破坏特征，对煤、岩石及其复合体进行了力学性能试验。采用红外热像仪实时监测失稳破坏过程中的红外（IR）辐射响应信号。建立了煤岩失稳破坏的数值模型，并验证了其有效性。得到了失稳破坏过程中的变形应力场和位移等值线。失稳时，“煤”段底部形成大量裂纹，向界面延伸，形成波浪状变形区。与“岩石”段相比，“煤”段红外热像图的差异更为明显。界面处存在高应力区，导致应力差较大的区域。然而，“煤”段底部也表现出应力差较大的区域和更明显的失稳破坏趋势。位移等值线显示，“煤”段底部许多单元发生了滑动和错位，导致损伤累积，局部损伤水平升高。这是导致红外热像图差异显著现象的关键因素。
