黄金科学技术 ›› 2020, Vol. 28 ›› Issue (2): 228-237.doi: 10.11872/j.issn.1005-2518.2020.02.154
Honglu FEI1(),Yu LIU1(),Qifei QIAN1,Qiang SU2,Xiaoyu SUN1
摘要:
根据爆炸应力波和爆生气体的理论,考虑地应力的作用,结合断裂力学中最大周向应力理论,推导出了偏心不耦合装药条件下初始裂隙和扩展裂隙的计算公式。选取2号岩石乳化炸药和3类典型岩石参数对偏心不耦合装药下的裂隙范围进行了计算,并分析地应力对爆炸应力波引起的初始裂隙的影响。结果表明:炮孔壁上各点的不耦合系数由偏转角度α、炮孔与药卷半径之差决定;炮孔上不耦合系数的不同,致使偏心不耦合装药结构下裂隙分布十分不均匀,耦合侧与不耦合侧裂隙长度存在较大差异;地应力的存在抑制了裂隙的扩展,随着地应力的不断增大,炮孔周边裂隙范围逐渐减小,不耦合侧最短裂隙对应角度α逐渐增大,且其裂隙范围接近粉碎区半径。当3类岩石爆破施工中遇到高地应力时,采用三角形布孔,考虑不耦合侧裂隙很短或者不产在的情况,炮孔间距应控制在0.45~0.70 m之间。
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80项成果获得中国黄金协会科学技术奖 |
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