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Information Circular 8667: Pumped-Slurry Backfilling of Inaccessible Mine Workings for Subsidence Control

Public Domain


Details

  • Personal Author:
  • Description:
    In undermined urban areas, new solutions to subsidence problems are being sought. The Bureau of Mines is investigating a hydraulic backfilling technique whereby fill material is pumped as a slurry through a closed system and widely distributed in inaccessible mine workings from a single borehole. A full-scale demonstration was completed in 1973 in Scranton, Pennsylvania, which is underlain by abandoned anthracite mines in several coalbeds superposed one above another. A 30-acre residential area was stabilized by injecting about 450,000 cubic yards of crushed mine refuse into two coalbeds through five injection boreholes. Nearly 200,000 cubic yards was injected through one borehole from which the material moved into the mine workings on all sides; the injected material reached a maximum lateral distance of 640 feet and filled mine openings from floor to roof. In the gravity-feed method formerly used to backfill inaccessible mine workings, quantities of fill injected per borehole averaged about 300 cubic yards. The gravity-feed method required many closely spaced injection holes and provided incomplete filling. The new method, designed for inundated mines, proved successful also in mine workings about mine-water pool level. Distribution of slurry through a buried pipeline minimized disturbance to the community. (Out of print.) [Description provided by NIOSH]
  • Subjects:
  • Series:
    Mining Publications
  • Subseries:
    Information Circular
  • Document Type:
    Text
  • Genre:
    Report
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    WO - Washington Office
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    126 pdf pages
  • Contributor:
    Carlson, E. J.
  • NIOSHTIC Number:
    nn:10008020
  • NTIS Accession Number:
    PB-241118
  • Citation:
    NTIS: PB 241 118 :83 pages
  • Federal Fiscal Year:
    1975
  • Peer Reviewed:
    False
  • Source Full Name:
    NTIS: PB 241 118
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:20af03d245fd0c0c6fc06f2308a12a2763a1835bacb4419433dcd16bceb55b467709a6b6836e720fde5418e1d10d927232355852bfde807f0c67bb66841b4df6
  • Download URL:
  • File Type:
    Filetype[PDF - 6.89 MB ]
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