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针对剧烈采动下大断面沿空煤巷围岩破坏突出的难题,以王家岭矿20321沿空煤巷为研究对象,综合钻孔窥视监测、结构力学分析、数值模拟研究以及现场工业性试验等方法,探究大断面沿空煤巷采动影响下非对称矿压显现的规律。结果表明:典型沿空煤巷围岩破坏具有明显的不对称性,顶板结构不对称是围岩非对称破坏的直接诱因;实测基本顶断裂位置始于巷道上方距煤柱1.1 m处,并斜向采空侧延伸;沿空煤巷围岩收敛呈斜“一”字形,沿空煤巷两侧载荷的差异性,促使巷道围岩呈不对称破坏发展趋势。提出高预应力锚杆索桁架非对称控制技术,有效控制了典型沿空煤巷围岩变形,丰富了大断面沿空煤巷围岩控制理论及实践经验。
Aiming at the problem of surrounding rock destruction of gob-side entry coal under severe mining, taking the mine roadway of 20321 Wangjialing mine as the research object, comprehensive drilling peep monitoring, structural mechanics analysis, numerical simulation research and on-site industrial experiment Method to explore the law of the emergence of asymmetrical rock pressure under the influence of the mining of large-area gob-side entry. The results show that the failure of the surrounding rock of typical goaf has obvious asymmetry and the unsymmetrical roof structure is the direct inducement of the asymmetric failure of the surrounding rock. The measured position of the basic roof rupture starts at 1.1 m above the coal pillar and is inclined Extending to the gob side; the convergence of the surrounding rock of the roadway along the coal seam is oblique “a ” shape, the difference of load on both sides of the roadway along the air, prompting the development trend of the surrounding rock is asymmetric. The asymmetric control technology of high prestressed anchor cable trusses is proposed to effectively control the deformation of surrounding rock of typical goaf roadways and to enrich the surrounding rock control theory and practical experience of large section coal roadways.