Experiment Study of Stemming Length and Stemming Material Impact on Rock Fragmentation and Dynamic Strain

Stemming length and stemming materials are crucial factors in blasting design, which affect the sustainability of mining. This study investigates influence material on rock fragmentation, recoil, surface strain response through 15 small-scale model tests. The results indicate that when using clay as a material, increasing facilitates fragmentation reduces recoil area. measurements show both tensile compressive peaks crater increase with growth length, while upper decrease. A comparative analysis different reveals performs best, exhibiting highest total weight fragments, size, energy utilization. Strain generates more significant higher loading rates surface, favoring concentrated application explosive improving fragmentation. Sand + yields fragments medium-sized particles than stemming. If goal is to utilization efficiency reduce hazards it recommended use In addition, if uniform desired (reducing large fine particles), combination sand can be used. These findings have practical implications for optimizing design engineering applications.