Discrete element simulation for investigating fragmentation mechanism of hard rock under ultrasonic vibration loading,Energy Science & Engineering

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Discrete element simulation for investigating fragmentation mechanism of hard rock under ultrasonic vibration loading
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-06-21 , DOI: 10.1002/ese3.768
Qiongqiong Tang _{1,

2} , Dajun Zhao _{1,

2} , Yu Zhou _{1,

2} , Zengzeng Zhang _{1,

2}

Affiliation

Assisted ultrasonic vibration technique can significantly improve the efficiency of hard rock drilling in petroleum and mineral engineering. In this study, to determine the fragmentation mechanism of rocks under ultrasonic vibration, numerical simulations using the discrete element method (DEM) were performed. A novel flat‐joint model (FJM), combined with an ultra‐high‐frequency loading boundary condition, was used to model the damage process of the hard rock under ultrasonic vibration loading. The numerical results demonstrated that the evolution of local strain and fragmentation were in good agreement with the experimental results. Based on the established model, the influence of loading parameters was investigated. Furthermore, by analyzing the development of the full strain field, crack orientations, and crack distribution, the fragmentation mechanism was revealed for the rock under ultrasonic vibration. Under ultra‐high‐frequency loading, the rock deformed in a heterogeneous manner and produced both compressive and tensile strain zones. The compressive zones were mainly distributed in the fringe and tensile zones in the top center. The generated tensile cracks caused by compression and tension in these two strain zones led to the rock failure.

中文翻译：

超声振动载荷作用下硬岩破碎机理研究的离散元模拟

辅助超声振动技术可以显着提高石油和矿物工程中硬岩钻进的效率。在这项研究中，为了确定岩石在超声振动下的破碎机理，使用离散元方法（DEM）进行了数值模拟。结合超高频载荷边界条件，采用新颖的平接头模型（FJM）对超声振动载荷作用下的硬岩破坏过程进行建模。数值结果表明，局部应变的演化和断裂与实验结果吻合良好。基于建立的模型，研究了载荷参数的影响。此外，通过分析完整应变场，裂纹取向和裂纹分布的发展，揭示了岩石在超声振动作用下的破碎机理。在超高频载荷下，岩石以非均质方式变形并产生压缩应变区和拉伸应变区。压缩带主要分布在顶部中心的边缘带和拉伸带。在这两个应变区域中，由压缩和拉伸引起的拉伸裂纹导致岩石破裂。

更新日期：2020-06-21

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