Generalized equation for calculating rock cutting efficiency by pulsed water jets

One of the promising methods for rock cutting technology is the use of high-speed water jets.In order to improve the cutting capacity of water jets without increasing the hydraulic power of equipment,pulsed water jets are basically used to increase the rock cutting efficiency.However,there are no mature recommendations for selection of rational parameters,and the relationship between indicators of rock cutting efficiency and parameters of pulsed water jet is still not established.In this context,we aimed at developing a generalized equation for calculating rock cutting efficiency,in which all the major parameters in consideration of rock cutting process are included.Then,a calibration of the rational parameters of rock cutting by pulsed water jets was conducted.The results are likely helpful for increasing productivity and reducing energy consumption.

Universal Method for the Prediction of Abrasive Waterjet Performance in Mining

极端采矿条件下的硬岩破碎可采用磨料水射流(AWJ)技术,这种技术能够在不产生粉尘的条件下有效切割难以机械加工的材料。这种技术还可用于爆破、本安和消防安全。就断裂力学而言,每一种可被破坏的材料均可被视为韧性或脆性材料。因此,需要找到一种无论使用AWJ对何种材料进行切割都能精确预测其效率的方法。该问题可通过能量守恒法加以解决,它显示了材料去除量与AWJ动能之间的比例。本文介绍了基于能量守恒法的预测方法,并提出如何达到最有效破坏水平的建议,以及关于涉及磨料流量与水流量、靶距和磨料颗粒粒径关系值的合理范围的建议。本文还提供了基于断裂力学的临时结构法确定材料破坏起始阈值条件的参数。