Reference is made to the requirements for a full face tunnel machine for operational use in the British mining industry in connection with the need to drive arterial roadways in hard rock to open up new working districts, or inter-mine connections. Negotiations within the industry and appropriate government departments is described which led to the design and construction of a prototype machine whereby data could be obtained on the operational behaviour of disc cutter types and configurations, and on the characteristics of main and ancillary bearings and environmental control techniques. Designed on a modular basis so that no single piece exceeded 1.5 M by 1.5 M by 2.35 M, and with no single piece exceeding 6 tons in weight, the installation of the machine in dawdon colliery for operational trials is discussed. The results of the operational trials over A distance of more than 1000 M are presented and discussed. On the basis of performances achieved, the author suggests that it would seem that a tunnel of some 3000 M continuous length is needed to arrive at a break-even cost per metre when compared with conventional drivages. However, a rise in wages of some 30 per cent would reduce this figure by 700 M. This comparison is based on the assumption of an average weekly advance of 15 M using conventional mechanised methods, roadheaders or mechanical loading in strata containing less than 50 per cent coal. The author considers that future developments, based on the experiences gained from driving the 3.65 M diameter tunnel in dawdon colliery, and the benefits that arise due to the earlier completion of arterial roadway systems will improve the economic justification for the use of such machines. /TRRL/


  • English

Media Info

  • Pagination: p. 21-25

Subject/Index Terms

Filing Info

  • Accession Number: 00183374
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Proceeding
  • Files: ITRD, TRIS
  • Created Date: Dec 29 1978 12:00AM