Described are research efforts to obtain accurate data to verify previously developed equations for mechanical tunnel boring. Procedures pertinent to machine design and performance were also investigated. A laboratory indentation test procedure was designed to predict field boring performance. Extensive indentation tests were conducted in samples of three rock types, results of which confirmed the applicability of indentation tests as a reliable tool to predict disc cutting forces. Field boring data from an active tunneling site indicate that indentation tests can be used as a means of accurately estimating field boring performance. Prediction equations developed during the course of the first year's research were applied to boring data from four ongoing tunneling projects and actual machine performance. An automatic acquisition system was installed on a tunnel boring machine (TBM) to obtain extensive and accurate boring data. Laboratory linear cutting tests were performed to gain a preliminary understanding of the effect of a cutterhead profile on TBM performance. Good correlation was obtained between theoretical and laboratory results of forces involved in cutting with disc-button cutters. Comments and recommendations are offered concerning the design and operation of TBM. Extensive data, graphs, illustrations and equations are included.

  • Corporate Authors:

    Colorado School of Mines

    Excavation Engineering and Earth Mechanics Institute
    Golden, CO  United States  80401

    National Science Foundation

    Engineeing and Applied Science, 1800 G Street, NW
    Washington, DC  United States  20550
  • Authors:
    • Ozdemir, L
    • Wang, F D
  • Publication Date: 1979-2

Media Info

  • Pagination: 222 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00305429
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: EMI-427 Final Rpt., NSF/RA-790161
  • Contract Numbers: NSF-APR77-04183
  • Files: TRIS
  • Created Date: Feb 11 1980 12:00AM