区段煤柱下巷道修复加固技术

Repair and Reinforcement Technology of Mine Roadway under Sectional Coal Pillar

北峪煤矿3-101运输平巷从上覆2#煤层区段煤柱下方的一侧斜穿到另一侧,斜穿煤柱段距上覆煤柱垂直距离约为1.0～3.5m。2#煤层区段煤柱宽度为18m。斜穿煤柱段两帮相对移近量达2m左右、煤体破碎,巷道变形严重。针对这种情况,在分析巷道变形破坏原因及修复加固机理的基础上提出了修复加固技术,即采用水力膨胀锚杆支护两帮破碎煤体,顶板补打高强螺纹钢锚杆和锚索进行加强支护。工程实践表明,该技术能够使锚固区煤帮形成整体承载结构,使顶板形成组合梁承载结构,并与深部围岩相连,有效地控制了巷道围岩变形,取得了显著的技术经济效益。

No. 3 - 101 haulage roadway in Beiyu Mine was inclined passed from one bottom side to other bottom side under the sectional coal pillars overlying No. 2 seam and the vertical distance between the crossed pillar and the overlying coal pillar was about 1.0 ~ 3.5m. The width of the sectional pillar in No. seam was 18m. the convergence between the two side ribs of the inclined passed coal pillar section was about 2m, the coal mass was broken and the deformation of the gateway was serious. According to the conditions, base on the analysis on the deformation failure causes of the gateway and the repair and reinforcement mechanism, the repair and reinforcement technology of the gateway was provided. The hydraulic swelling bolt support was applied to the broken coal mass of the two side ribs and the high strength steel bar bolt and anchor was applied to the reinforced support to the roof. The engineering results showed that the support technology could make the coal ribs in the anchored area to be an integrated loading structure and could make the roof to be a combined beam loading structure and to be connected with deep surrounding rock. Thus the deformation of the surrounding rock could be effectively controlled with obvious technical and economic benefits.