Tunnel boring machines have been used in increasing numbers over the past few years. They seem to be taking over a large segment of underground work which was reserved until recently for drill and blast methods. Some contractors that are now using boring machines would have used drill-blast methods for the same job only five years ago. This is indicative of a continuous rate of improvement in boring machine technology. Yet in Scandinavian countries where very hard rock types predominate, the introduction of mechanical boring has been much slower. Is this because they know more about how to make an inexpensive tunnel by blasting, or are the machines not yet capable of boring economically in Scandinavian rock? These are questions which need to be clarified before more is learned about the development trends in tunnel boring machines for hard rock applications. The paper deals with the main constraints to mechanical boring progress, and indicates the development in the next few years. The number of the covering abstract of the conference is IRRD 231024. /TRRL/

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  • Corporate Authors:

    Swedish Council for Building Research

    St Goergansgatan 66, Box 27063
    S-11230 Stockholm,   Sweden 
  • Authors:
    • Robbins, R J
  • Publication Date: 1977

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Filing Info

  • Accession Number: 00174077
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Document D3:1977
  • Files: ITRD, TRIS
  • Created Date: Jun 28 1978 12:00AM