This article reviews a report entitled Pneumatic-Hydraulic Material Transport System for Rapid Excavation of Tunnels which was prepared at the Colorado School of Mines under contract to the U.S. Department of Transportation. The principal authors were Robert F. Faddick and James W. Martin. The report covers in detail the methods, costs, advantages, and disadvantages of pneumatic-hydraulic slurry muck removal from tunnels. In this article the findings presented in the original report are summarized. The advantages of the slurry muck removal method include high volume transport capacities, compact lateral configuration, few moving parts resulting in high availability, the ability to work continuously in gaseous areas, low manpower requirements, minimal damage to the environment outside of the tunnel (when the muck is transported through buried pipe to the spoil area), removal of tunnel water inflow can be used to advantage by the system, and automated control. The disadvantages include the reduced rock size requirements for optimum transport through the line, it cannot be extended without shutdown of the entire system, a secondary transport system is required for materials and supplies, it requires sufficient water which is not always available, and dewatering is required to remove solids at the discharge in most cases requiring settling ponds or some other type of drying area. Estimated production figures under average conditions indicate the slurry method is capable of removing 300 tons of muck per hour over a 1000 ft. or 1250 ft. distance. However, 14 in. and 16 in. pipe is required for this amount of tonnage demanding 1350 to 1600 hp.

  • Corporate Authors:

    Westamerica Publication

    609 Mission Street
    San Francisco, CA  United States  94105
  • Publication Date: 1975-8

Media Info

  • Features: Figures;
  • Pagination: p. 38-39
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00125009
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 18 1975 12:00AM