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Roof control of stress-relief jointing near outcrops in Central Appalachian drift coal mines.

Authors
Sames-GP; Moebs-NN
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9313, 1992 Jan; :1-11
Link
NIOSHTIC No.
10011340
Abstract
This report discusses some practical applications of a geotechnical investigation conducted by the U.S. Bureau of Mines that can help mine operators meet revised federal regulations in their roof control plans. The investigation, designed to characterize roof conditions near the coalbed outcrop in drift coal mines in eastern Kentucky, revealed that weathered stress-relief joints near outcrop are crucial ground control factors in the region. The joints' origin and character were determined through underground mapping of many joints in coal mine roof and detailed observations and measurement of joint trends and physical characteristics in widely separated strip mine highwalls and roadcuts. This resulted in an understanding of stress-relief-joint patterns and the effect of various rock types on the intensity of weathering in the joints. That information is used in this report to show how stress-relief joints contribute to roof failure and how, through improved roof support and mine planning, safer roof support plans can be developed.
Keywords
Rock-mechanics; Geologic-investigations; Roofs; Mining-engineering; Stress-relieving; JointsJunctions; Subsurface-investigations; Weathering; Topographic-features; Design; Coal-mines; Underground-supporting
Publication Date
19920101
Document Type
IH; Information Circular
Fiscal Year
1992
NTIS Accession No.
PB92-201045
NTIS Price
A03
Identifying No.
IC-9313
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9313
State
KY; PA
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