针对深井厚煤层综放大跨度7 m宽开切眼变形严重、施工支护困难的情况,采用新型高预应力锚杆锚索联合支护方式,合理选择支护参数,采用高强度高预应力锚杆锚索一次成巷施工工艺。试验结果表明:该施工支护技术可使开切眼变形得到有效控制,顶板下沉量小于160 mm,两帮移近量小于150 mm,施工时间缩短50 d,实现了快速安全施工。

According to the serious deformation, difficult construction and support of the large span 7 m wide open-off cut for fully mechanized top coal caving mini ng face in thick seam of a deep mine, a new high pre-stressed bolt and anchor combined support method was applied, rational support parameters were selected and b olt and anchor of high strength and high prestress technique of the mine roadway was applied. The experiment results showed that the construction and support technol ogy could effectively to control the deformation of the open-off cut, the roof subsidence value was less than 160 mm, the convergence between the two sidewalls of the gateway was less than 150 mm and the construction time was reduced by 50 days.Thus a rapid and safe construction was realized.