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.

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  • Corporate Authors:

    JAPANESE NATIONAL RAILWAYS

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

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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