深部大跨度切眼顶板分区控制技术

针对深部大跨度切眼顶板自稳能力差、变形剧烈、支护困难等问题,以赵固二矿1105大采高工作面切眼支护为工程背景,综合现场调研、理论分析、顶板探测等方法,分析了深部大跨度切眼冒顶机理和不同顶板的控制关键,提出了以接长锚杆支护为主导的顶板分区控制技术,阐明了不同顶板分区的控制原理。据此,对赵固二矿1105切眼二次成巷进行了支护设计,并进行了顶板下沉量和顶板失稳垮落规律监测,结果表明：接长锚杆与中部层位顶板共同形成的“锚固体岩梁”呈现出较好的稳定性,各层位顶板均得到了有效控制,保证了切眼顶板安全与正常服务。

Hierarchical control technology for large-span set-up room roof in deep

The large-span set-up room roof in deep usually has poor self-stability, acute deformation and supporting difficulties. We took the set-up room support of 1105 large-mining-height panel in Zhaogu No.2 mine as research background, analyzed the roof failure mechanism and the key of roof control in different layers through field research, theoretical analysis and roof detection, put forward a hierarchical control technology dominated by lengthened bolt support, and stated the hierarchical control principle. According to this principle, the second tunneling supporting design of 1105 set-up room in Zhaogu No.2 mine was made, and the roof convergence as well as the roof fall and failure were monitored. The results indicate that the "anchor roof beam", which is collectively formed by lengthened bolt and middle layer roof, shows good stability. And roof of every layer is controlled effectively, which well ensures the safety of set-up room roof and normal service.