Shuai Yunlin, Ma Zhenqian, Feng Xiaolei
College of Mining, Guizhou University, Guiyang, 550025, Guizhou, China.
School of Mining, Guizhou University, Guiyang, China.
Sci Rep. 2025 Jan 21;15(1):2631. doi: 10.1038/s41598-024-79218-0.
In order to solve the problems of serious deformation and difficult support of roadway surrounding rock in the process of gob-side entry driving, taking 230,708 working face of Huopu Mine as the engineering background, the migration characteristics of overburden rock and the stress distribution of surrounding rock before and after roof cutting in the process of gob-side entry driving were studied by means of theoretical analysis, similar simulation test and field measurement. The results show that: ① the establishment of lateral suspension mechanical model analysis found that, with the increase of coal seam dip angle, the reduction of the coal pillar bearing capacity before and after cutting the top gradually decreases, the dip angle of coal seam is 30°, Compared with the reduction of coal pillar bearing capacity before roof cutting is 2164 KN; with the increase of the overburden rock caving angle, the reduction of the coal pillar bearing capacity before and after cutting the top increases continuously, the caving angle of overburden rock is 63°, Compared with the reduction of coal pillar bearing capacity before roof cutting is 2218 KN. ② After the implementation of roof cutting and cutting off the overhanging roof structure, the stress of the surrounding rock of the coal pillar gang in the roadway has significantly decreased by 18.87%, and the stress of surrounding rock of roadway solid coal gang, roof and floor is reduced by 8.48%,5.79% and 4.81% respectively, which relieved the concentration in the surrounding rock stress of the roadway and improves the stress condition of the roadway. The study concludes that roof cutting can not only change the stress environment of the surrounding rock in the roadway, but also increase the filling degree of the goaf, realizing that the coal pillar and the gangue in the goaf jointly bear the overburden rock pressure, ensuring the stability of the roadway.
为解决沿空掘巷过程中巷道围岩变形严重、支护困难等问题，以火铺矿230708工作面为工程背景，采用理论分析、相似模拟试验和现场实测等方法，研究了沿空掘巷过程中覆岩移动特征及切顶前后围岩应力分布规律。研究结果表明：①建立侧向悬伸力学模型分析发现，随着煤层倾角增大，切顶前后煤柱承载能力降低值逐渐减小，煤层倾角为30°时，切顶前煤柱承载能力降低值为2164kN；随着覆岩垮落角增大，切顶前后煤柱承载能力降低值不断增大，覆岩垮落角为63°时，切顶前煤柱承载能力降低值为2218kN。②实施切顶切断悬顶结构后，巷道煤柱帮围岩应力显著降低18.87%，巷道实体煤帮、顶板和底板围岩应力分别降低8.48%、5.79%和4.81%，缓解了巷道围岩应力集中，改善了巷道应力状况。研究得出，切顶不仅能改变巷道围岩应力环境，还能提高采空区充填程度，实现煤柱与采空区矸石共同承载覆岩压力，保证巷道稳定性。
