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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Impact of blast design parameters on rock fragmentation in building stone quarries
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Impact of blast design parameters on rock fragmentation in building stone quarries

机译：爆炸设计参数对建筑石头矛盾岩石碎片的影响

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摘要

Crushed stone aggregates are indispensable construction material which is produced by crushing of raw stone boulders raised from stone quarries through the process of drilling and blasting. Proper size of boulders fed to the crusher is important to eliminate congestion in the crushing circuit and obtaining the desired productivity. Drill-blast design parameters have a considerable effect on the degree of post-blast fragmentation. Bench height, spacing, burden, stemming, bench stiffness ratio and powder factor are controllable blast design parameters which considerably influence the fragmentation. By controlling these design parameters, optimum fragmentation can be achieved. Extensive field trials followed by scientific analysis have been done in this study which reveals the relation between drill-blast design parameters and post-blast fragmentation. Burden, spacing, stemming, bench stiffness ratio and powder factor were varied over a range of 30-45% which in turn caused distinctions in the mean fragment size in the range of 50-200% approximately. For optimum mean fragment size, the burden was found to be 21 times the blast hole diameter. Spacing dimension of 1.3 times the burden produced the optimum mean fragment size. Stemming length of 0.91 times of burden generated the optimum fragmentation. Mean fragment size was most optimum at powder factor of 1.02 kg/cum.
机译：碎石骨料是不可或缺的建筑材料，通过钻孔和爆破过程中碾碎从石头采石场中提出的原石巨石制造。馈送到破碎机的适当尺寸的巨石对于消除破碎电路中的拥塞并获得所需的生产率是重要的。钻探式设计参数对爆破后碎片的程度具有相当大的影响。台高，间距，负荷，茎，卧位刚度比和粉末因子是可控的爆破设计参数，可显着影响碎片。通过控制这些设计参数，可以实现最佳的碎片。在本研究中已经进行了广泛的实地试验，然后进行了科学分析，揭示了钻爆设计参数与爆破后碎片之间的关系。在30-45％的范围内变化的负荷，间距，茎，卧位刚度和粉末因子，这反过来又在平均片段大小范围内造成的区别在50-200％范围内。对于最佳平均片段大小，发现负担是爆破孔直径的21倍。间距尺寸为1.3倍的负担产生了最佳平均片段大小。茎长为0.91次负担，产生了最佳的碎片。平均片段大小在1.02千克/暨粉末因子下最佳。

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