基于爆破漏斗试验的地下扇形中深孔爆破参数优化研究OA

Under the deep geostress environment,ore-rock masses exhibit distinct mechanical properties and fragmentation characteristics that markedly differ from those observed in shallow deposits.To optimize the blasting parameters for fan-shaped medium-deep holes in the deep stope of Tonglushan Copper-Iron Mine,crater blasting tests were conducted at the 9428 stope of the-485 level,following a comprehensive analysis of the ore-rock mechanical properties at this depth.Optimized medium-length hole blasting parameters were systematically derived from a thor-ough analysis of crater morphology and specific explosive consumption characteristics,with subsequent industrial-scale trials confirming their technical validity and operational feasibility.The research findings demonstrate that the rock mass integrity coefficient of the skarn in the 9428 stope of the-485 level at Tonglushan Mine measures 0.39,classifying it as relatively fragmented according to the Standard for Engineering Classification of Rock Mass.Single-hole carter blasting tests revealed optimal parameters including:charge center burial depth(0.400 m),critical burial depth(0.898 m),strain energy coefficient(1.69 m/kg1/3),optimal burial depth ratio(0.445),optimal crater radius(0.461 m),and optimal crater volume(0.014 m).Subsequent double-hole and inclined bench crater tests deter-mined an optimal hole spacing of 0.809 m and a minimum crater burden of 0.740 m.Applying blasting similarity theory to production-scale fan-shaped medium-deep holes(64 mm diameter),recommended parameters include:hole bottom spacing(1.3～1.6 m),hole mouth spacing(0.8～1.3 m),and row spacing(1.1～1.4 m).