Introduction:　Cavability　issues　often　arise　in　hard　rock　mines　employing　the　block　caving　mining　method.　Hydraulic　fracturing　stands　out　as　a　promising　pre-conditioning　technology　for　hard　rock　masses,　with　its　pre-conditioning　effects　dependent　on　variable　parameters.Methods:　The　impact　of　cluster　number,　injection　rate,　and　liquid　volume　on　fracture　propagation　was　investigated　through　on-site　hydraulic　fracturing　practices.　Fracturability　was　initially　verified　via　true　triaxial　fracturing　tests,　and　preconditioning　parameters　were　subsequently　optimized　using　numerical　simulations.　The　optimized　on-site　construction　was　monitored　using　electromagnetic　methods.Results:　The　study　revealed　a　negative　correlation　between　fracture　radius　and　the　number　of　clusters,　gradually　decreasing　with　an　increase　in　cluster　number.　However,　the　fracture　weakening　area　increased　with　the　rise　in　the　number　of　clusters.　The　fracture　weakening　area　also　increased　with　the　injection　rate.　Additionally,　the　fracture　radius　initially　increased　and　then　decreased.　Both　fracture　weakening　area　and　radius　increased　with　an　increase　in　liquid　volume.　The　optimized　parameters　were　identified　as　four　clusters,　an　injection　rate　of　4　m3/min,　and　a　liquid　volume　of　500　m3.Discussion:　Building　upon　these　findings,　on-site　experiments　were　conducted　and　monitored　using　electromagnetic　methods.　The　monitored　results　demonstrated　that　the　optimized　parameters　effectively　achieved　hydraulic　fracturing　expansion,　accomplishing　the　goal　of　weakening　hard　rock.