In the hard-rock mining industry, the generation of fines during blasting is an important issue because it has a significant effect on production processes. Although various approaches have been used to estimate fines generation in recent decades, as a practical matter, measuring the amount of fines is nearly impossible given the technical limitations and the scale of mine blasts. In this study, a dynamic PPV damage model was developed and applied to predict fines generation as a result of blasting. This modified version of the crushed zone model (CZM) considers dynamic rock properties and peak particle velocity (PPV), which represents the induced stress in blasting. Dynamic rock-fracturing tests were conducted using a split Hopkinson pressure bar (SHPB) to determine the parameters that represent the relationships between rock strength and strain rate as well as the relationships between fines amount and strain rate in the model. A case study was conducted that entailed determining the radius of the crushed zone for given blast designs and rock properties and then measuring the fines amount within this crushed zone. This case study indicated that the dynamic PPV model can provide a rough estimate of fines generation for given dynamic rock properties and blast design parameters and that this method has the potential to be a useful indicator, or index, of fines generation.

中文翻译：

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使用动态岩石特性和近场 PPV 损伤模型估计爆破中的细粉生成

在硬岩采矿业中，爆破过程中产生的细粉是一个重要问题，因为它对生产过程有重大影响。尽管近几十年来已使用各种方法来估算细粉生成量，但实际上，考虑到技术限制和矿山爆破的规模，测量细粉量几乎是不可能的。在这项研究中，开发了一种动态 PPV 损伤模型，并将其应用于预测爆破产生的细粉。这种破碎区模型 (CZM) 的修改版本考虑了动态岩石特性和峰值粒子速度 (PPV)，它代表了爆破中的诱导应力。使用分裂式霍普金森压力棒 (SHPB) 进行动态岩石压裂试验，以确定代表岩石强度与应变率之间关系以及模型中细粒量与应变率之间关系的参数。进行了一项案例研究，需要确定给定爆破设计和岩石特性的破碎区半径，然后测量该破碎区内的细粉量。该案例研究表明，动态 PPV 模型可以粗略估计给定动态岩石特性和爆破设计参数的细粉生成，并且该方法有可能成为细粉生成的有用指标或指数。进行了一项案例研究，需要确定给定爆破设计和岩石特性的破碎区半径，然后测量该破碎区内的细粉量。该案例研究表明，动态 PPV 模型可以粗略估计给定动态岩石特性和爆破设计参数的细粉生成，并且该方法有可能成为细粉生成的有用指标或指数。进行了一项案例研究，需要确定给定爆破设计和岩石特性的破碎区半径，然后测量该破碎区内的细粉量。该案例研究表明，动态 PPV 模型可以粗略估计给定动态岩石特性和爆破设计参数的细粉生成，并且该方法有可能成为细粉生成的有用指标或指数。