Journal of Northeastern University:Natural Science ›› 2017, Vol. 38 ›› Issue (6): 839-844.DOI: 10.12068/j.issn.1005-3026.2017.06.016

• Mechanical Engineering • Previous Articles     Next Articles

Study on Characteristics of Breaking Rock by Double Edge Central Disc Cutter Under Confining Pressure

ZHANG Xu-hui1, XIA Yi-min1, LIU Jie2, TAN Qing1   

  1. 1. College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; 2. College of Resources and Safety Engineering, Central South University, Changsha 410083, China.
  • Received:2016-04-20 Revised:2016-04-20 Online:2017-06-15 Published:2017-06-11
  • Contact: XIA Yi-min
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Abstract: In order to study the law of rock-breaking by double edge central disc cutter under different confining pressure, a numerical simulation model was established based on particle discrete element. The change laws of crack propagation and specific energy were analyzed. The results show that, as the double edge central disc cutter invades into the rock, the crack propagation along the vertical direction will be constrained with the increase of confining pressure. The influence of confining pressure on the crack propagation is different between the two cutter edge when the cutter spacing is different. There exists three kinds of breaking modes as the confining pressure and cutter spacing change. The increase of confining pressure will change the breaking mode when cutter spacing is moderate. There exists an optimal cutter spacing and the optimal cutter spacing tends to increase with the increase of confining pressure. The experimental results show that the double edge central disc cutter invaded into rock under different confining pressure is in good agreement with the simulation results in the effect of crack propagation and the change of breaking mode.

Key words: double edge central disc cutter, confining pressure, cutter spacing, crack, specific energy

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