›› 2016, Vol. 37 ›› Issue (8): 2172-2179.doi: 10.16285/j.rsm.2016.08.007

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of breakage mechanisms of rock induced by a pick and associated cutter spacing optimization

ZHANG Qian-qian1, HAN Zhen-nan1, ZHANG Meng-qi2, ZHANG Jian-guang2   

  1. 1. College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China; 2. Taiyuan Institute of China Coal Technology and Engineering Group, Taiyuan, Shanxi 030006, China
  • Received:2014-07-22 Online:2016-08-11 Published:2018-06-09
  • Supported by:

    This work was supported by the Basic Research Project Program of Shanxi (No. 2015011061), the National High-tech R&D Program of China (863 Program) ( 2012AA06A405) and the Coal Mine Equipment Research of Postgraduate Education Innovation Center of Shanxi Province (MKY2011-004).

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Abstract: According to fracture characteristics of rock caused a pick and its related data, breakage mechanisms and breaking effects of rocks influenced by different cutter spacing are analyzed. Cutting tests with different cutting depths and cutter spacing are performed using a rotary cutting machine with a single pick. The cutter spacing is optimized by three indicators, i.e. specific energy, coarseness index and cutting force, and the optimum ratio of cutter spacing to cutting depth for one type of sandstone is determined. Experimental results show that breaking process of the sandstone is divided into five phases, i.e. the generation of fine chips in a primary crushed zone, the formation of nucleus and its energy accumulation, the extension and connection of cracks, the falling of fracture and the regeneration of fine chips in a secondary crushed zone. The fracture is dominated by tensile failure and meanwhile accompanied by squeezing and shearing failure. Under the optimum cutting conditions, the higher coarseness index occurred when the rate of blocks is increased, and specific energy is lower. Through analyzing rock breaking process and the optimization of cutter spacing, it provides reference for breakage mechanism of rock by the roadheader and its pick arrangement.

Key words: rotary cutting, rock breakage mechanism, cutter spacing optimization, specific energy, coarseness index

CLC Number: 

  • TU 454

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