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Yang Zhifang
During underground rock excavation at the Jintao Gold Mine, ground pressure issues have led to occur-rences of roof caving and sidewall spalling at the tunnel face and formed roadways, particularly in fractured zones where roof caving and sidewall spalling are more frequent. This study evaluates the support effectiveness for roofs of varying classes using numerical simulation and field application. Results indicate that although the underground rock mass quality at the Jintao Gold Mine is generally good, stress concentration tends to occur at the arch shoulder during roadway excavation. By reinforcing the arch shoulder and adopting appropriate support methods and parameters for roofs of varying classes, favorable outcomes have been achieved in the production process.