IMPORTANCE OF GROOVE SPACING IN TUNNEL BORING MACHINE OPERATIONS

The spacing between two neighboring grooves created by the travel of the cutters affects the interaction between the grooves and thus the advance rate and overall efficiency of the tunnel boring machine. Selecting the correct spacing for each specific job requires a thorough understanding of the cutting characteristics of the rock material. Results of cutting experiments with a seven-inch (180-mm) rolling disk cutter in marble, limestone, granite, and quartzite are presented and examined. The values of muck weight per unit length, groove depth, cutting coefficient, and specific energy are taken as indicators of the cutter performance for each test condition. Determination of the optimum and critical groove spacing for field operations can easily be performed with values of any one of the performance indicators based on the interrelation between rock strength indices and cutter performance indicators. /Author/

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Filing Info

  • Accession Number: 00125518
  • Record Type: Publication
  • Report/Paper Numbers: ASCE #11589 Proceeding
  • Files: TRIS
  • Created Date: Dec 16 1976 12:00AM