THE PARTICLE SIZE DISTRIBUTIONS OF DEBRIS PRODUCED DURING TUNNELLING TRIALS

This report presents data on the particle-size distributions of debris and the amounts of energy expended while cutting chalk with drag picks and disc cutters during the tunnelling trials at Chinnor, Oxfordshire. Samples of debris were sieved and generalised relations were found between the coarseness index and the specific energy values. However there was considerable scatter in the results much of it attributable to variations in rock strength. Because of this only primary trends could consistently be distinguished and it was concluded that a debris-size distribution approach is unlikely to provide a useful method of assessing tunnel boring machine performance.

• Corporate Authors:

  Transport and Road Research Laboratory (TRRL)

  Wokingham, Berkshire  United Kingdom 
• Authors:
  • TOOMBS, A F
  • SNOWDON, R A
  • O'REILLY, M P
• Publication Date: 1976

Media Info

• Features: Appendices; Figures; Photos; References;
• Pagination: 20 p.

Subject/Index Terms

• TRT Terms: Boring; Chalks; Coarse grained materials; Debris removal; Scattering; Specific energy; Tunneling; Tunneling machines
• Uncontrolled Terms: Debris; Particle size distribution
• Old TRIS Terms: Coarse materials
• Subject Areas: Bridges and other structures; Energy; Geotechnology; Highways;

Filing Info

• Accession Number: 00139735
• Record Type: Publication
• Report/Paper Numbers: TRRL LR 714
• Files: TRIS
• Created Date: Sep 21 1976 12:00AM