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Effects of Structural Faults on Ground Control in Selected Coal Mines in Southwestern Virginia.

Authors
Molinda-GM; Ingram-DK
Source
MISSING :25 pages
Link
NIOSHTIC No.
10007407
Abstract
Large structural faults create serious ground control hazards, as well as adversely affect coal mine production. Two faults related to the Pine Mountain overthrust sheet in Buchanan County, Virginia, were investigated by the Bureau of Mines to determine their effect on ground control and to develop recognition criteria for prediction. Five underground mines encountering these faults were visited and mapped for structural information. This information, along with surface mapping, indicated that the Pistol Gap and Keen Mountain faults show right-lateral, strike-slip faulting and bedding planes slippage, which can be projected linearly and vertically. These fault zones are up to 200 ft wide, with coalbed offsets up to 18 ft vertically, coalbed swags (depressions) up to 15 ft, and roof falls up to 20 ft high. Recognition criteria include bedding plane slips, coalbed offsets, fault gouge, coalbed swag (depressions or synclines), and disturbed bedding. These recognition criteria will help an informed operator realize that many sudden coalbed discontinuities are related to larger geologic events (in this case thrust faulting) and can be projected linearly and vertically. Ground control strategies include mine designs that minimize fault exposure. Mining plans can be adjusted based on type and extent of fault movement.
Publication Date
19890101
Document Type
IH; Report of Investigations;
Fiscal Year
1989
NTIS Accession No.
NTIS Price
Identifying No.
RI 9289
NIOSH Division
PRC;
Source Name
MISSING
State
VA;
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