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Improved Design and Support Techniques for Coal Mine Entry Intersections.

Authors
Hanna-K; Conover-DP
Source
Proc 8th Int'l Strata Control Conf Dusseldorf 1989 May; :20 pages
Link
NIOSHTIC No.
10007205
Abstract
This U.S. Bureau of Mines paper describes the development of improved design and ground support techniques for coal mine entry intersections to reduce the severity of ground control problems associated with high horizontal stresses and variable geological conditions. Through field investigations and numerical modeling studies, four major parameters that influence the failure behavior of entry intersections were identified: in situ stresses, geological discontinuities, intersection geometry, and diagonal roof span. Three primary design criteria are emphasized: prompt installation of support, control of failure progression, and minimization of diagonal roof span. Conceptual and proven implementations are also discussed.
Publication Date
19890501
Document Type
OP;
Fiscal Year
1989
NTIS Accession No.
NTIS Price
Identifying No.
OP 153-89
NIOSH Division
DRC;
Source Name
Proc. 8th Int'l Strata Control Conf., Dusseldorf, May, 1989; Federal Republic of Germany, 20 Pp
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