Effects of nozzle position and waterjet pressure on rock-breaking performance of roadheader

Z.H. Liu, C.L. Du, Y.L. Zheng, Q.B. Zhang, J. Zhao

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17 Citations (Scopus)


The performance of roadheaders in cutting hard rocks can be improved using high-pressure waterjet technology. The optimum position of waterjet nozzles and the threshold pressure in rotary cutterheads have not been well studied. This study investigates the effects of the waterjet-nozzle position and waterjet pressure on the cutting torque and thrust force of scaled roadheaders with point-attack picks. The experimental results show that the waterjet helps in significantly reducing the cutting torque and thrust force. Moreover, the rock-breaking performance is the best when the nozzles are positioned at the center of the pick. For the center-positioned configuration with a pressure of 40 MPa, the specific energies of three types of rocks are reduced by 41.3, 28.3, and 20.1%. The effects of the nozzle position and waterjet pressure on the dust suppression and pick wear are also examined and a fine-dust suppression coefficient of over 70% is achieved.

Original languageEnglish
Pages (from-to)18-27
Number of pages10
JournalTunnelling and Underground Space Technology
Publication statusPublished - 1 Oct 2017


  • Conical pick
  • Roadheader
  • Rock breaking
  • Waterjet

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