Impact Hazard of Strip Filling Mining in Upward Mining Faces

Coal resources serve as a fundamental pillar for global economic development and remain the dominant energy source in China. To improve coal resource utilization and assess the impact hazards related to strip filling mining, this study selects the No. 3-3 coal seam of a mine in Tuokexun as its engineering context. By integrating theoretical investigation and numerical modeling, a comparative evaluation was performed between the conventional mining approach and the strip filling mining technique in terms of impact hazard. The results reveal that during the first phase of strip filling mining—characterized by a high filling ratio—the level of impact hazard remains minimal. Relative to the traditional method, the peak advance abutment pressure during the second phase of strip filling mining is reduced by as much as 17.8%. Moreover, significant reductions are observed in stress concentration, deformation intensity, and the extent of plastic zone propagation along the retreat roadway. Under the conventional method, the influence range is approximately 70 m, whereas under strip filling mining, it decreases to about 60 m. These insights confirm that strip filling mining can effectively diminish impact-related hazards and enhance the safety of underground coal extraction operations.