Lan Tianwei, Liu Yonghao, Yuan Yongnian, Fang Ping, Ling Xiangdong, Zhang Chuang, Li Yabin, Li Yang, Feng Wei
College of Mining, Liaoning Technical University, Fuxin, China.
Ordos Institute of Liaoning Technical University, Ordos, China.
Sci Rep. 2024 May 30;14(1):12419. doi: 10.1038/s41598-024-63352-w.
This article conducts a comprehensive study on the activation characteristics of faults in the mine and analyzes the distribution patterns of the original rock stress field. Through quantitative research and analysis, we determine the partitioning characteristics of tectonic stress in the mine field under the dual effects of fault activation and original rock stress. The study also reveals the significant impact of different fault activation characteristics and different tectonic stress partitions on the stability of roadway surrounding rock. Using the Mohr-Coulomb strength criterion as a foundation, we investigate the mechanisms of fault activation and establish a mathematical model for fuzzy comprehensive evaluation. This model enables us to determine the strength level of fault activation in coal seam 9 of the Limin coal mine and construct a geological structure model. It has realized the transformation of fault activation degree from qualitative evaluation to quantitative evaluation. The stress state analysis software is used to draw the division of tectonic stress dangerous areas under the synergistic effect of fault activation and original rock stress. We then analyze the impact on the stability of roadway surrounding rock in these different hazardous areas. Utilizing the fuzzy comprehensive evaluation method, we take into account the impact of faults on the distribution characteristics of stress fields and the stability of roadway surrounding rock. This approach enables us to more accurately and comprehensively determine the hazardous areas of tectonic stress in the mine field under the dual effects of faults and original rock stress.
本文对矿井断层活化特征进行了全面研究，分析了原岩应力场的分布规律。通过定量研究与分析，确定了在断层活化与原岩应力双重作用下井田构造应力的分区特征。研究还揭示了不同断层活化特征和不同构造应力分区对巷道围岩稳定性的显著影响。以莫尔-库仑强度准则为基础，研究了断层活化机制，建立了模糊综合评价数学模型。该模型能够确定利民煤矿9号煤层断层活化的强度等级，并构建地质构造模型。实现了断层活化程度从定性评价到定量评价的转变。利用应力状态分析软件绘制了断层活化与原岩应力协同作用下构造应力危险区的划分图。然后分析了这些不同危险区域对巷道围岩稳定性的影响。运用模糊综合评价方法，考虑断层对应力场分布特征和巷道围岩稳定性的影响。这种方法使我们能够更准确、全面地确定在断层和原岩应力双重作用下井田构造应力的危险区域。
