Japanese contractors will be using the world's largest-diameter pressurized slurry shield tunnel boring machine to cut a stormwater detention tunnel. Bentonite slurry is pumped into a bulkhead behind the machine's rotating turret at a constant pressure higher than the water pressure of the surrounding strata. The slurry prevents the soil from collapsing and the water from infiltrating at the face. The slurry is then pumped out of the bulkhead with the spoil to the rear of the machine for separation. The bentonite is recycled back to the bulkhead and the spoil is piped to the surface in slurry form.

  • Availability:
  • Corporate Authors:

    McGraw-Hill, Incorporated

    330 West 42nd Street
    New York, NY  United States  10036
  • Publication Date: 1984-3

Media Info

  • Pagination: p. 19
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00392604
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Apr 29 1985 12:00AM