黄金科学技术 ›› 2019, Vol. 27 ›› Issue (4): 565-572.doi: 10.11872/j.issn.1005-2518.2019.04.565
Weihua WANG1(),Tengfei SUN1(),Xitao LIU2
摘要:
对于地下开采,预留光爆层进行二次爆破可以保证巷道掘进面轮廓成形效果,减少围岩损伤。基于地应力、应力波和爆生气体等共同作用理论,对预留光爆层二次爆破进行参数优化。分析预留光爆层厚度对地应力重分布的影响以及二次应力对爆生裂纹扩展的影响,可知二次应力会抑制爆生裂纹扩展,且预留光爆层厚度与二次应力大小呈正相关;分析在不考虑损伤、考虑一次损伤和考虑二次损伤条件下,轴向不耦合系数及炮孔间距大小的变化,可知考虑损伤可以适当增大轴向不耦合系数和炮孔间距。以焦家金矿深部开采工程为背景,对比爆破参数优化前后爆破效果,可知在深部开采时考虑地应力和损伤,能提高半孔率和节约成本。研究结果为地下开采爆破标准化提供了理论依据。
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