MORE MUCKING METHODS FOR EXCAVATION EFFICIENCY

This article presents a review of the most up-to-date mucking out methods and equipment beyond the traditional rudimentary rail-based system or trucks. Open-face loading when a tunnel face comprises fairly homogeneous material of medium to soft strength can be done with a conventional hydraulic excavator, but it is usually more efficient to use a dedicated loader because it will be more mobile between headings. They can have crawler-track or wheeled chassis and be equipped with side-tipping buckets. Load-haul-dump vehicles designed for mining, can also be used in tunnel construction where there is low headroom, multiple faces and partial extraction systems. Muck trucks are generally high powered to produce fast cycle times and maneuver steep slopes or drifts. There are also cassette trucks where the muck pan is felt behind near the face while the drive unit goes to the dump with the other. Belting out can be extremely productive if the system is well-designed and maintained and integrated with TBM backup assemblies. A table is provided to calculate volume and capacity of different conveyor configurations. Slurry systems use pumps, usually centrifugal, and media, often plain water, though clay can produce difficulties unless the system is carefully design. Additives usually need to be added to muck produced by EPBMs. Muck handling is also an important consideration on the surface location where space is often at a premium and bottlenecks have to be avoided. Treatment and classification of tunnel waste is also often required.

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  • Corporate Authors:

    Polygon Media Limited

    Tubs Hill House, London Road
    Sevenoaks, Kent TN13 1BY,   United Kingdom 
  • Authors:
    • Jones, M
  • Publication Date: 2005-4

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01001674
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS
  • Created Date: Jul 7 2005 12:00AM