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

Authors
Whaite-RH; Allen-AS; Carlson-EJ
Source
NTIS: PB 241 118 :83 pages
Link
NIOSHTIC No.
10008020
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 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.)
Publication Date
19750101
Document Type
IH; Information Circular;
Fiscal Year
1975
NTIS Accession No.
PB-241118
NTIS Price
A06
Identifying No.
IC 8667
NIOSH Division
WO;
Source Name
NTIS: PB 241 118
State
PA;
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