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.

通过炸药破碎岩石是提取有价值矿物的首选方法。 这也是大多数土木挖掘作业的首选方法。 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.碎片尺寸分布的预测及其控制将是所有采矿和采石作业中非常显着的改进。它们影响所有“下游”操作，例如装载、破碎、研磨和铣削。这些不仅直接关系到运营的经济性，而且还关系到其安全性。 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.