Determination and experimental study on technical parameters of bolt-shotcrete support for deep rock roadway

In order to solve the problem of deep rock roadway stability control, a large-size three-dimensional numerical calculation model of “bolt support and concrete shotcrete layer” was established by means of numerical simulation and field industrial test. The control effect of bolt and shotcrete support parameters on roadway deformation was systematically studied. The research showed that: with bolt pre-tightening force, spacing, the increase of the anchorage length, to effectively control the deformation of surrounding rock of roadway, and is subject to the control of pre-tightening force and the anchoring length is more significant, and the appropriate anchor length can effectively control the deformation of roadway, the strength of spraying layer and the thickness is small, the structure of spray layer will cause the deformation of roof and floor of roadway to shift to two sides, when the spray layer reaches a certain strength and thickness, spray layer structure can improve the overall control effect of surrounding rock of roadway. Based on research results, we design the spray anchor net supporting technology and parameters, and the industrial test its rationality was verified.