Abstract:To solve the technical problem of long-span continuous broken roof support in the Jinchanghe polymetallic mine, the rock mechanics test and engineering geological survey were carried out, and the rock mass quality classification of large-diameter long-hole stope was obtained. Based on the construction of the three-dimensional numerical model of a typical mining area, the numerical simulation analysis of three support schemes was carried out, and the top structure layout of the "roof support wall + point column" of the roof cutting chamber and the combined support scheme of anchor cable and anchor bolt were determined. Combined with the field application, the stress value of the roof area after support was reduced by 61.6%, and the displacement of the roof was reduced by 59.4%, which greatly improved the safety of the broken roof and ensures the safe and efficient mining of the mine. The multi-scale coordinated control technology of anchor cable and bolt could greatly improve the safety of the broken roof and ensured safe and efficient mining of mines. The research results could provide guidance for the optimal design of roof support schemes in similar mines.