ESTIMATING METHODS OF IN SITU ROCK - STRENGTH BY NON-CORE BORING

This report describes the investigation of three methods of non-core boring: Correlation of cutting speed and thrust; Correlation of boring power and cutting speed; Use of a cutting coefficient. The first and third methods agree with results determined by actual core drilling. It is proposed that to further refine the non-core method, it would be necessary to correct for abrasion of the bit, to speed up the analysis by using digital data management; and to correlate results with actual tunneling rather than merely with core drilling.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3127232
• Supplemental Notes:
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• Corporate Authors:

  JAPANESE NATIONAL RAILWAYS

  TOKYO,   Japan 
• Authors:
  • Misawa, S
  • TAKAHASHI, A
• Publication Date: 1974-12

Media Info

• Features: Figures;
• Pagination: p. 217-218
• Serial:
  • Railway Technical Research Institute, Quarterly Reports
  • Volume: 15
  • Issue Number: 4
  • Publisher: Railway Technical Research Institute/Tetsudo Gijutsu Kenkyujo
  • ISSN: 0033-9008
  • Serial URL: http://www.rtri.or.jp/eng/

Subject/Index Terms

• TRT Terms: Physical properties; Rock drilling; Rocks; Soil mechanics; Structural design; Tunneling; Tunnels
• Uncontrolled Terms: Tunnel design
• Old TRIS Terms: Rock properties
• Subject Areas: Bridges and other structures; Geotechnology; Railroads;

Filing Info

• Accession Number: 00084933
• Record Type: Publication
• Source Agency: Railway Technical Research Institute
• Report/Paper Numbers: Quart Rpt.
• Files: TRIS
• Created Date: May 29 1975 12:00AM