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