乌山铜钼矿预裂爆破成缝与减振效果试验研究
Experimental Study on Crack Formation and Vibration Reduction Effect of Pre-splitting Blasting in Wushan Copper-molybdenum Mine
杨晓光 1朱磊2
作者信息
- 1. 中国黄金集团内蒙古矿业有限公司
- 2. 马鞍山矿山研究院爆破工程有限责任公司
- 折叠
摘要
爆破振动是露天矿山生产过程中常见的爆破公害.为降低爆破振动对矿山固定帮边坡的影响,以乌山铜钼矿为背景,通过理论计算,得出了矿区南矿段花岗岩、北矿段花岗岩、角砾熔岩、次斜长花岗斑岩4种典型岩性预裂孔开裂及贯通时的线装药密度值,并开展典型岩性不同线装药密度的预裂爆破现场试验.结果表明:采用理论计算的线装药密度参数,在预裂缝完全开裂时,4种岩性的测点减振率可分别达到37.15%、43.77%、42.86%、48.36%;且随着预裂缝开裂程度的加剧,测点降振率明显提高;而当预裂缝完全开裂后,开裂程度继续加剧对降振率的提高效应逐渐降低.合理的临帮预裂爆破参数可以有效降低临近固定帮的爆破振动速度,对矿山安全具有重要参考意义.
Abstract
Blasting vibration is a common blasting hazard in the production process of open-pit mines.In order to reduce the influence of blasting vibration on the fixed slope of the mine,taking Wushan Copper-molybdenum Mine as the background,through theoretical calculation,the linear charge density values of pre-splitting holes in four typical lithology of granite in the south section,granite in the north section,brec-cia lava and sub-plagioclase granite porphyry were obtained,and the pre-splitting blasting field tests with different linear charge densities of typical lithology were carried out.The results show that when the pre-crack is completely cracked,the vibration reduction rates of the measuring points of the four lithology can reach 37.15%,43.77%,42.86%and 48.36%respectively by using the theoretically calculated line charge density parameters.And with the increase of pre-crack cracking degree,the vibration reduction rate of the measuring point is obviously improved.When the pre-crack is completely cracked,the effect of increasing the degree of cracking on the vibration reduction rate is gradually reduced.Reasonable pre-splitting blasting parameters can effectively reduce the blasting vibration velocity near the fixed side,which has important ref-erence significance for mine safety.
关键词
爆破振动/预裂爆破/线装药密度/减振Key words
blast vibration/pre-splitting blasting/linear charge density/vibration reduction引用本文复制引用
出版年
2024
NETL
NSTL
万方数据