Evolution of Overlying Strata Bed Separation and Water Inrush Hazard Assessment in Fully Mechanized Longwall Top-Coal Caving of an Ultra-Thick Coal Seam

作者：Shun Liang, Xuepeng Zhang, Fang Ke, Jinhui Liu, Qiangling Yao, Hongye Luo, Xuehua Li, Yingnan Xu · 发表于：Water · 年份：2025 · DOI：10.3390/w17060850 · 被引用次数：12 · 研究领域：Geoscience and Mining Technology、Geomechanics and Mining Engineering、Rock Mechanics and Modeling

Bed-separation water hazards are a common and very harmful mining disaster in the mining areas of western China in recent years, which seriously threatens the safe mining of rich and thick coal seam resources in the West. The Yonglong mining area has become a high-risk area for bed-separation water hazards due to its particularly thick coal seams and strong water-rich overlying strata. In view of this, this paper investigates the development height of a water-flowing fractured zone in the fully mechanized caving mining of an ultra-thick coal seam in the Yonglong mining area, the evolution law of the bed separation of overlying strata, and the process of water inrush from a bed separation. Based on the measured water-flowing fractured zone height data of the Yonglong mining area and several surrounding mines, a water-flowing fractured zone height prediction formula suitable for the geological conditions of the Yonglong mining area was fitted. By using discrete element numerical simulation and laboratory similarity simulation, the evolution law of overlying strata separation under the conditions of fully mechanized caving mining in the study area was analyzed, and the space was summarized into “four zones, three arches, and five zones”. Through the stress-seepage coupling simulation of the water inrush process of the roof separation in the fully mechanized caving mining of an ultra-thick coal seam, the migration, accumulation, and sudden inrush of water in the aquifer in overly...