Design and numerical simulation of rock bolting and shotcrete for deep tunnels with high stress in Jinchuan Mine

Considering the deformation characteristics of deep tunnels with high stress in Jinchuan Mine,a synthetic controlling technology composed of pre-stressed cables was put forward.In order to forecast supporting effect and parameter optimization,numerical simulation technology was studied and executed for rock bolting and shotcrete tunnels with high stress and jointed creeping rock masses.Two supporting types and their parameters were given first.Then subsectional softening model and parameter of dilatancy were adopted based on crash creep characteristics of joined rock masses and supporting strength index of anchorage body were put forward.Finally,1178 subsections of tunnels with high stress were analyzed and evaluated with the above-mentioned numerical method and technology,and parameters were optimized.