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Pumped-Slurry Backfilling of Inaccessible Mine Workings for Subsidence Control.


PB241118

Publication Date 1975
Personal Author Whaite, R. H.; Allen, A. S.
Page Count 126
Abstract 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 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, using five injection boreholes. Nearly 200,000 cubic yards was injected through one borehole from wich the material moved into the mine workings on all sides, reaching a maximum lateral distance of 640 feet, and filling mine openings from floor to roof. In the gravity-feed method formerly used to backfill inaccessible mine workings, quantities of fill per borehole averaged about 300 cubic yards, requiring many closely spaced injection holes and providing incomplete filling.
Keywords
  • Mining engineering
  • Subsidence
  • Backfills
  • Control
  • Slurries
  • Injection
  • Pumping
Source Agency
  • Bureau of Mines
NTIS Subject Category
  • 48A - Mineral Industries
  • 50B - Civil Engineering
Corporate Authors BUREAU OF Mines, Washington, D.C.
Document Type Technical Report
Title Note Information circular.
NTIS Issue Number 197513
Pumped-Slurry Backfilling of Inaccessible Mine Workings for Subsidence Control.
Pumped-Slurry Backfilling of Inaccessible Mine Workings for Subsidence Control.
PB241118

  • Mining engineering
  • Subsidence
  • Backfills
  • Control
  • Slurries
  • Injection
  • Pumping
  • Bureau of Mines
  • 48A - Mineral Industries
  • 50B - Civil Engineering
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