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: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=568962
• 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.

爆炸性的岩石破碎是提取有价值的矿物质的首选方法。 它也是大多数民用发掘操作的首选方法。然而，尽管实践的盛行率过多，但对于给定的爆炸岩合组合的爆炸结果的准确预测仍然非常困难，因为它涉及大量变量，这些变量对爆炸结果的影响尚未量化。碎片尺寸分布及其控制的预测将是所有采矿和采石作业的极大改善。它们会影响所有“下游”操作，例如装载，压碎，磨削和铣削。这些直接依赖于行​​动的经济学，而且依赖于他们的安全。目前不可能预测大型爆炸的所有方面，但是我们对爆炸性类型，爆炸设计和目标岩石相关性能之间相互关系的增量有所改善将有很长的路要达到实现最终目标。在过去的几十年中，包括该作者自己在识别关键变量（包括该作者）的几个研究小组中，我们对爆破过程的理解取得了长足的进步。其中之一是由于钻孔中的爆炸性作用与爆炸中最终的片段分布引起的断裂过程之间的联系。但是，对大规模操作中所有互连参数的系统研究是不可行的，因此需要对良好表征的岩石和爆炸物进行控制测试和高级分析。这项拟议的研究旨在开发一个这样的“构建基础”，以开发一种预测性可靠的碎片预测模型。