厚煤层工作面切眼支护设计与应用分析

Design and Application of Open-off Cut Support in Thick-coal-seam Working Face

以古城矿N1306工作面切眼为工程背景进行支护系统研究分析;基于围岩自稳平衡拱理论和悬吊理论分别确定切眼巷道顶板和两帮破坏深度分别为2.28 m和2.39 m,计算确定锚杆和锚索有效支护长度分别2.4 m和10.3 m,并确定支护系统的有效性。得到数值模拟得到,在两帮位置应力较为集中,应力集中系数1.92,底板变形较大,最大变形量为140 mm。设计的支护系统通过工业性试验确定切眼巷道围岩变形快速增长周期为60天,其中两帮变形量和顶板下沉量最大值分别为162 mm和200 mm,说明支护系统能有效控制切眼巷道围岩变形要求。

By analysis of the open-off cut support system in N1306 working face of Gucheng Colliery,the paper proposes the effective support system with 2.4 m support length of bolt and 10.3 m support length of anchor based on the 2.28 m failure depth of roadway roof and 2.39 m failure depth of two sides obtained through surrounding rock auto-balanced arch theory and suspension theory,whose industrial testing shows that the period of the rapid growth of surrounding rock is 60 days with the maximum deformation of 162 mm in two sides and maximum roof subsidence of 200 mm,effectively controlling the surrounding rock deformation of open-off cut roadway.