Cooperative evolution of the mining stress field-fracture field and disaster-forming mechanism in steeply inclined and extra-thick coal seam
LAI Xingping1, 2, WANG Hao1, 2, CUI Feng1, 2, LI Haodang3, LIU Xudong3, FENG Panfei3
(1. College of Energy and Mining Engineering, Xi?an University of Science and Technology, Xi?an, Shaanxi 710054, China; 2. Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi?an University of Science and Technology, Xi?an, Shaanxi 710054, China; 3. Xinjiang Energy Co., Ltd., State Energy Group, Urumqi, Xinjiang 830002, China)
Abstract： In response to the engineering challenges posed by unclear disaster-causing mechanisms and inadequate control effectiveness for roadway surrounding rock in steeply dipping and extra-thick coal seams, this study focuses on the +400 mB3 roadway in Wudong Coal Mine. A comprehensive research methodology was employed, integrating on-site monitoring, theoretical analysis, numerical simulation, and industrial testing. The investigation examined the evolution and rotation characteristics of the principal stress path under excavation disturbance in steeply dipping and extra-thick coal seams. Additionally, the study elucidated the driving mechanisms behind mining-induced stress evolution, which leads to fracturing in the coal and rock mass, and revealed the mechanism of roadway surrounding rock disasters induced by the coupling effects of the stress field and fracture field. The results indicate that the surrounding rock in the lower section of the roadway is significantly influenced by mining activities, undergoing a stress evolution process characterized by ?1 loading followed byσ3 unloading. The principal stress axis exhibits spatially differential rotation, deviating from its initial orientation. Notably, the degree of stress rotation is most pronounced in the roadway roof, with rotation angles ranging from 16.7° to 20.8°. Due to the impact of mining activities, the stress level within the coal and rock mass reaches its strength threshold, leading to the formation of mining-induced fractures. The angle of stress rotation determines the predominant propagation direction of these fractures, while the presence of the mining-induced fracture field compromises the mechanical integrity and strength of the surrounding rock in the roadway. After the unloading associated with roadway excavation, mining-induced cracks continue to propagate, primarily characterized by Mode I tensile failure. As the inclination angle of these cracks increases, the anti-unloading failure resistance of the coal and rock mass gradually strengthens, resulting in a transition of the failure mode from crack-dominated to matrix material-dominated. The disaster-causing mechanism of the roadway surrounding rock can be summarized as follows: the orientation of stress rotation governs crack propagation, the formation of a crack network weakens the load-bearing structure, and strength degradation leads to large deformation. Under the coupled effects of the stress field and fracture field, the roadway experiences deformation and failure. To address these challenges, a surrounding rock stability control strategy combining “overall reinforcement with key point strengthening” has been developed for roadways in steeply inclined and extra-thick coal seams. Following the implementation of the reinforcement support, the stability of the roadway?s surrounding rock has been significantly enhanced. The findings of this research provide a solid scientific foundation for the control of surrounding rock in steeply inclined and extra-thick coal seams, as well as in similar roadways.
来兴平1，2，王 昊1，2，崔 峰1，2，李浩荡3，刘旭东3，冯攀飞3. 急倾斜巨厚煤层采动应力场–裂隙场协同演化及孕灾机制[J]. 岩石力学与工程学报, 2025, 44(10): 2533-2550.
LAI Xingping1, 2, WANG Hao1, 2, CUI Feng1, 2, LI Haodang3, LIU Xudong3, FENG Panfei3. Cooperative evolution of the mining stress field-fracture field and disaster-forming mechanism in steeply inclined and extra-thick coal seam. , 2025, 44(10): 2533-2550.
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2025, Vol. 44 
