MB OR DB? THE CHOICE FACING TUNNELLERS TODAY

Machine boring (mb) of tunnels in rock has developed so far during recent years that this method is under most rock conditions a technical alternative to traditional drilling and blasting (db). Thus, in many cases of rock tunnelling there is a choice between the two methods. The object of the whole workshop was to produce background for making this choice by collecting experience from various conditions. The object of this introductory paper is to define some of the concepts and terms involved and to suggest ways of comparing some of the limitations and properties of tunnelling methods in diagrams. Included are: geometric data (area, diameter, length, inclination, curve radii), rock properties (rock sample strength, abrasivity, rock mass standability time and span, average distance between cracks), excavation advance rate and slowness, linear cost, volume cost, specific energy consumption, specific power and thrust. Some other influencing factors are mentioned in suggested alternative statements: circular versus noncircular cross section, need for support and vibration disturbances. /TRRL/

  • Corporate Authors:

    Swedish Council for Building Research

    St Goergansgatan 66, Box 27063
    S-11230 Stockholm,   Sweden 
  • Authors:
    • Fischer, H C
  • Publication Date: 1977

Media Info

  • Features: Figures; References;
  • Pagination: p. 9-25
  • Serial:
    • ASFALT
    • Publisher: VERENIGING VOOR BITUMINEUZE WERKEN

Subject/Index Terms

Filing Info

  • Accession Number: 00174110
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Document D3: 1977 Monograph
  • Files: ITRD, TRIS
  • Created Date: Jun 28 1978 12:00AM