基于S-ALE算法的巷道孤石光面爆破围岩损伤规律研究OA

Isolated boulders in roadways present substantial safety risks in mining operations.This research in-vestigates the efficacy of blasting techniques for isolated boulder removal and their influence on adjacent rock dam-age,utilizing smooth blasting principles and the innovative S-ALE computational method.A precisely scaled 3D nu-merical model was developed based on a roadway project in a Yunnan underground metal mine to comprehensively examine how surrounding rock damage varies with different linear charge densities and borehole spacing configura-tions during smooth blasting of isolated boulders.The results indicate that:(1)surrounding rock damage follows an"inverse S-shaped"attenuation pattern with increasing distance from the blast center;(2)maximum damage depth demonstrates linear growth with higher linear charge density but shows fluctuating behavior with borehole spacing var-iations,peaking at 0.36 m and reaching minimum at 0.40 m spacing;(3)rock damage exhibits substantially greater sensitivity to linear change density adjustments compared to borehole spacing modifications.The optimal parameters balancing blasting efficiency and explosive consumption are determined to be a linear charge density of 0.30 kg/m(decoupling coefficient 1.43)and a borehole spacing of 0.40 m.The extensive free surface of isolated boulders re-sults in a significantly shallower maximum damage depth than with conventional smooth blasting,consistent with ob-served reductions in plastic strain both perpendicular to and along the tunnel contour toward the free face.These re-sults offer practical technical references for field applications.