To　address　the　distribution　characteristics　of　rock　fragmentation　and　energy　utilization　efficiency　under　explosive　loading　in　decoupling　charge　structures,　this　study　employed　methods　including　fracture　mechanics,　fractal　theory　analysis,　model　experiments,　and　numerical　simulations.　The　findings　are　as　follows:　(1)　Under　model　test　conditions,　both　the　fractal　dimension　of　fragmentation　and　the　energy　consumption　of　rock　fragmentation　first　increase　and　then　decrease　with　the　radial　air　decoupling　coefficient　(K).　The　fractal　dimension　of　fragmentation　ranges　between　1.05　and　1.67,　while　the　explosive　energy　utilization　efficiency　ranges　between　2.08　%　and　3.62　%;　(2)　The　trends　of　fragmentation　and　energy　utilization　efficiency　are　generally　consistent,　and　when　the　K　value　is　approximately　1.5,　both　fragmentation　and　energy　utilization　efficiency　achieve　optimal　states;　(3)　The　numerical　simulation　results　align　with　the　indoor　model　test　outcomes,　with　the　correlation　coefficient　of　the　obtained　fragment　size　distribution　to　the　G-G-S　function　exceeding　0.90.　This　demonstrates　that　the　Smoothed　Particle　Hydrodynamics　(SPH)　method　can　effectively　predict　rock　fragmentation　distribution　under　non-coupled　charges;　(4)　Field　tests　verify　the　accuracy　of　the　research　results,　and　the　results　show　that　the　average　pass　rate　of　blasting　can　be　significantly　improved　when　the　K　value　is　1.5　∼　1.8,　which　is　consistent　with　the　model　test　and　numerical　simulation　results.　©　2024