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Sub-surface cracks due to to disc cutter spacing for improved rock breakage and ground control

Conference Paper


Abstract


  • The importance of using disc cutters for rock excavation is reflected by their wide application in hard rock cutting machines such as tunnel boring machines and raise borers. The forces involved in the cutting process are those due mainly to thrust and rolling forces and are greater than that required by cutting picks. An interesting feature of cutting with discs is the formation of surface crushing, surface and sub-surface chipping and primary crack formation. Experimental, as well as analytical, work has been carried out to determine the optimum spacing between the disc cutters to control primary crack orientation. Wedge bit indenters were used to simulate disc cutters. The paper concludes by proposing a new approach to rock excavation by hybrid cutting based on controlling the primary crack orientation.

Publication Date


  • 1992

Citation


  • Aziz, N. I., & Guo, H. (1992). Sub-surface cracks due to to disc cutter spacing for improved rock breakage and ground control. In Unknown Conference (pp. 667-675).

Scopus Eid


  • 2-s2.0-0027097327

Web Of Science Accession Number


Start Page


  • 667

End Page


  • 675

Abstract


  • The importance of using disc cutters for rock excavation is reflected by their wide application in hard rock cutting machines such as tunnel boring machines and raise borers. The forces involved in the cutting process are those due mainly to thrust and rolling forces and are greater than that required by cutting picks. An interesting feature of cutting with discs is the formation of surface crushing, surface and sub-surface chipping and primary crack formation. Experimental, as well as analytical, work has been carried out to determine the optimum spacing between the disc cutters to control primary crack orientation. Wedge bit indenters were used to simulate disc cutters. The paper concludes by proposing a new approach to rock excavation by hybrid cutting based on controlling the primary crack orientation.

Publication Date


  • 1992

Citation


  • Aziz, N. I., & Guo, H. (1992). Sub-surface cracks due to to disc cutter spacing for improved rock breakage and ground control. In Unknown Conference (pp. 667-675).

Scopus Eid


  • 2-s2.0-0027097327

Web Of Science Accession Number


Start Page


  • 667

End Page


  • 675