大断面开切眼一次成巷技术

Research on the once-tunneling technology of large section open-off cut

应用自稳隐形拱理论对董东煤矿50130开切眼顶板稳定性进行了分析,设计了开切眼一次成巷支护方案,确定了锚杆、锚索长度,锚杆直径和间排距。实测表明,采用全断面一次成巷技术减少了工序环节,缩短了开切眼施工时间,取得了较好的经济效益和社会效益。

By using the theory of self stabilizing invisible arch, the roof stability of No. 50130 open-off cut in Dongdong coal mine was analyzed,the once-tunneling supporting scheme of open-off cut was designed,and the supporting parameters were determined. The practice shows that using the once-tunneling technology can reduces the process links, shortens the construction time of the open-off cut,and achieves better economic and social benefits.