The conventional drill-blast-muck system uses an inexpensive energy source (chemical explosive) to break the hardest rocks. The main disadvantage is the cyclic nature of the operation, which restricts the daily advance to approximately 30 ft/day (9 m/day). The bureau of mines has sponsored three research contracts on the development of continuous drill-blast-muck systems that offer the potential of high advance rates by changing the frequency of the cycles or by performing some of the operations simultaneously. One of these systems has been abandoned after a preliminary feasibility study; the second is still in the conceptual stage; and the third shows considerable promise after a series of successful underground tests. This report presents a summary of these contracts with results to data. /TRRL/

  • Availability:
  • Corporate Authors:

    Swedish Council for Building Research

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

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00174174
  • 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