Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (6): 1808-1816.doi: 10.13278/j.cnki.jjuese.201506204

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

Tian Jialin1,2, Yang Zhi1, Fu Chuanhong1, Yang Lin1, Li You1, Zhu Yonghao1   

  1. 1. School of Mechanical Engineering, Southwest Petroleum University, Chengdu 610500, China;
    2. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2015-03-28 Published:2015-11-26

Abstract:

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.

Key words: high frequency, micro amplitude, vibration, frequency, rock breaking, crack

CLC Number: 

  • P634.5

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