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Controlling roof beam failures from high horizontal stresses in underground stone mines.

Authors
Iannacchione-AT; Dolinar-DR; Crosser-LJ; Marshall-TE; Oyler-DC; Compton-CS
Source
International Conference on Geomechanics/Ground control in Mining and Underground Construction, 1998 Jul; :525-541
Link
NIOSHTIC No.
20000119
Abstract
The U.S. and Australian coal and the Canadian hard rock mining industries have long recognized the significance of high horizontal stresses as a factor affecting the stability of roof and rib conditions in underground mines. Recently, a growing segment of the U.S. underground stone mining industry has also begun to recognize that horizontal stresses occur in some of its more than 90 mines. Considering the typically high strength and massive nature of limestone, this fact is a revelation in itself. High horizontal stresses produce extensive and sudden rock failures and, in some cases, resulted in injuries to mine workers. Through the years diverse control strategies have been proposed and experimented with. Reorientation of mine entries to reduce stress concentrations have proven successful and are widely accepted in practice. Other solutions, like rock reinforcement, are poorly understood and less accepted in practice. It is the purpose of this National Institute for Occupational Safety and Health (NIOSH) study to develop a better fundamental understanding of these ground control strategies under high horizontal stress conditions through a series of field and laboratory studies. To this end a design technique is presented which provides stone miners with a method for making stability assessments. The consequences of widening rooms, changing geology and horizontal stresses, and different rock bolts on roof beam failures are discussed.
Keywords
Mining-industry; Underground-mining; Mine-safety; Rock-falls; Injury-prevention; Miners
Contact
National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, Pittsburgh, PA 15236
Publication Date
19980717
Document Type
Conference/Symposia Proceedings
Editors
Aziz-NI; Indraratna-B
Fiscal Year
1998
NTIS Accession No.
NTIS Price
NIOSH Division
PRL
Source Name
International Conference on Geomechanics/Ground control in Mining and Underground Construction
State
PA
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