The discussion covered the subjects related to the selection of the most profitable areas for standardization, the function of the ANSI, the development of international standards, standardization of tunnel boring machines and lining, and standardization of rock testing. The point is made that ANSI is a federation of standards-developing organizations and a coordinating body with the ability to develop a standard following guidelines from members, and presenting that for domestic and international acceptance. Tunnel liners must first be standardized and then the responsibility of ordering the lining be placed upon the owner of the system. Laboratory and in situ rock testing is in the process of being standardized by the International Society of Rock Mechanics. It was pointed out that drafting of standards must go through the ISO. The standardization of tunneling sizes and the issue of whether steel sections should encroach on the concrete line are also considered. The question is discussed whether plain concrete lining would not serve the purpose of circular or almost circular tunnels as well as a reinforced concrete design. Comments are made on the assessment of tunnel bore diameter versus capital equipment cost. The importance of flexibility in tunnel design, and equipment is emphasized.

  • Supplemental Notes:
    • Report of a symposium conducted by Standing Subcommittee No. 5, International Activities of the U.S. National Committee on Tunneling Technology, held on May 21-22, 1974 in Washington, D.C.
  • Corporate Authors:

    National Research Council

    National Committee on Tunneling Technology
    Washington, DC  United States  20418
  • Authors:
    • Deere, Du
  • Publication Date: 1975

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Filing Info

  • Accession Number: 00127940
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 21 1976 12:00AM