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针对塔山煤矿15 m特厚煤层综放开采留宽煤柱(38~45 m)护巷所带来的矿压显现强烈,煤炭损失严重等问题,提出15 m特厚煤层综放窄煤柱沿空掘巷技术。以8204面为工程背景,采用理论计算和钻孔窥视,确定基本顶断裂线位置距采空区煤壁为4 m,并对掘巷前基本顶弧形三角块结构稳定性进行分析,得到巷道应布置在基本顶断裂线以外及悬臂梁平衡结构保护下的应力降低区内,综合确定煤柱宽度为6 m。基于巷道的控制难点,提出高强度高预应力锚杆索、多锚索-钢带桁架、梯级锚固束锚索、钢筋混凝土防护墙、向窄煤柱和相邻面采空区注浆的强力联合支护技术。现场实践表明,巷道围岩控制效果较好,说明采用窄煤柱和强力联合支护技术是可行的。
Aiming at the problems such as the strong underground pressure brought by retaining wide pillar (38 ~ 45 m) in fully mechanized top coal caving mining of 15 m thick coal seam in Tashan Coal Mine and the serious loss of coal, Roadway driving technology. Based on the engineering background of 8204 surface, the theoretical calculation and drilling peering were used to determine the location of the basic top fault line and the coal wall of the goaf with a thickness of 4 m. The stability of the basic top arc triangular block before excavation was analyzed, Should be arranged in the area of stress reduction outside the basic top fault line and under the protection of the cantilever balance structure, and the coal pillar width is determined to be 6 m. Based on the difficult control of roadway, this paper puts forward that the strength of high strength and high prestressed anchor cable, multi-anchor cable-truss, cascade anchor cable, reinforced concrete protective wall, grouting to narrow pillar and adjacent goaf Joint support technology. Field practice shows that the surrounding rock control effect is good, indicating that the use of narrow coal pillars and strong joint support technology is feasible.