高频微幅冲击振动作用下岩石破碎行为计算方法

针对现有岩石破碎研究的现状以及不足,进行高频微幅冲击振动作用下的岩石破碎行为计算方法研究。首先建立高频微幅冲击振动模型,在此基础上建立求解破岩体积、破岩比功、岩石裂纹长度的计算方法,并分析冲击频率、幅值对岩石破岩效率的影响。通过对比试验与算例结果,验证了计算方法的可靠性。结果表明:当冲击频率增加到2 000 Hz时,冲击时间的周期将减小到0.001 s,冲击力将会增加到12 900 N,钻头吃入岩石的深度以及冲击末速度也对应增加;并且高冲击频率、低幅值能够增加破岩体积、减小破岩比功、增加岩石裂纹长度。研究结论对于提高破岩效率,进行高频微幅冲击振动破岩的技术研究与工具研制具有参考价值。

Calculation Method of Rock-Breaking Behavior Under Impact Vibration of High Frequency and Micro Amplitude

To improve the existing technology of rock breaking, this paper presents one method for calculating rock-breaking behavior under shock vibration of high frequency and micro amplitude. Firstly, a shock vibration model of high frequency and micro amplitude is established. On this basis, rock-breaking volume, rock crushing work ratio, and crack length are calculated. And then, the impact of frequency and amplitude on the rock-breaking efficiency are analyzed. The results show that the circle of impact time decreases to 0.001 s when the frequency increases to 2 000 Hz; while the impact force increases to 12 900 N, and the bit penetration and final impact velocity are also increased. High frequency and low amplitude can increase the rock-breaking volume, reduce the rock crushing work ratio, and increase the rock crack length. The reliability of the calculation method is verified through comparison of the calculation results with the experimental tests. The study results are useful to improve the rock-breaking technology, efficiency, as well as the tool development for rock breaking under shock vibration of high frequency and micro amplitude.