Page 88 - 《爆炸与冲击》2025年第5期

第 45 卷 左 庭，等： 冲击荷载下含铜矿岩能量耗散的数值模拟 第 5 期

达到 1.2 MPa 时，裂纹在约 50 μs 开始生成，拉伸裂纹数占比达到最大，平均值为 62.30%，表明拉伸破坏
在整个过程中始终占据主导作用。
(4) 含铜矿石试件破碎块度的分形维数随耗散能的增加呈线性增长，矿岩宏观破碎程度加剧，粒径
不断减小，破碎块度的数目明显增多，均匀性越好，当耗散能从 19.52 J 增至 105.72 J 时，含铜矿岩破碎块
度的分形维数 D 提升了 26.43%。
b

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