Characteristic Fracture Pattern and Fragment Size Distribution in Rocks due to Stress Waves in Blasting

爆破应力波引起的岩石破裂特征及碎片尺寸分布

• 批准号: 46413-2012
• 负责人: Mohanty, Bibhuti
• 金额: $ 1.53万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=545016
• 关键词: Characteristic; Fracture; Pattern; Fragment; Size

Rock fragmentation by explosive is the preferred method of extraction of valuable minerals. It is also the preferred method for most civil excavation operations. However, despite overwhelming prevalence of the practice, accurate prediction of blast results for a given explosive-rock combination has remained exceedingly difficult, as it involves a very large number of variables whose effect on blast results is yet to be quantified. Prediction of fragment size distribution and its control would be a very significant improvement in all mining and quarrying operations. They affect all 'downstream' operations such as loading, crushing, grinding and milling. These have direct bearing not only on the economics of the operations but also on their safety. It is not possible at this time to predict all aspects of a large blast, but incremental improvement in our understanding of interrelationship between explosive type, blast design and relevant properties of the target rock would go a long way to meeting the ultimate objective. Considerable progress in our understanding of the blasting process has been made however during the last few decades by several research groups including this author's own in identifying the key variables. One of these is the link between fracture process due to explosive action in the borehole and the eventual fragment size distribution in a blast. However, systematic investigation of all the interconnecting parameters in large-scale operations is not feasible, hence the need for controlled tests and advanced analysis on well characterized rocks and explosives. This proposed research is aimed at developing one such 'building block' in our attempt to develop a predictive and reliable fragment prediction model.

用炸药破碎岩石是开采有价值矿物的首选方法。它也是大多数土木开挖作业的首选方法。然而，尽管这种做法非常普遍，但对于给定的炸药-岩石组合，准确预测爆炸结果仍然非常困难，因为它涉及到非常多的变量，这些变量对爆炸结果的影响尚未量化。预测破碎粒度分布及其控制将对所有采矿和采石作业产生重大影响。它们影响所有的“下游”操作，如装载、破碎、研磨和碾磨。这不仅直接关系到作业的经济性，也关系到作业的安全性。目前还不可能预测一次大爆炸的所有方面，但我们对炸药类型、爆炸设计和目标岩石相关性质之间相互关系的理解的逐步改进将大大有助于实现最终目标。然而，在过去的几十年里，我们对爆破过程的理解已经取得了相当大的进展，包括本作者自己的研究小组在内的几个研究小组在确定关键变量方面取得了进展。其中之一是由井内爆炸作用引起的破裂过程与爆炸中最终破片尺寸分布之间的联系。然而，在大规模操作中系统地研究所有相互关联的参数是不可行的，因此需要对特征良好的岩石和爆炸物进行控制试验和高级分析。本研究的目的是开发一个这样的“构建块”，我们试图开发一个预测和可靠的碎片预测模型。