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Performance characteristics for welded wire screen used for surface control in underground coal mines.

Authors
Dolinar-DR
Source
2009 SME Annual Meeting and Exhibit, February 22-25, Denver, Colorado, Preprint 09-104. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2009 Feb; :1-8
Link
NIOSHTIC No.
20035151
Abstract
The fall of small pieces of rock between roof bolts causes over 80 pct of the ground fall injuries in underground coal mines. Roof screen, if installed on the bolting cycle, can significantly reduce the number of these injuries. As the surface of the roof fails, the screen will have to retain the broken rock without failing or excessive deformation. Welded wire screen is the most common type of screen material used for roof surface control in underground coal mines. The load-deformation characteristics and the load capacity of welded wire screen were evaluated in the laboratory in a specially built test frame. In the frame, the square screen sections were held in place by bolts and bearing plates at the four corners while a center load was applied to the screen. The parameters evaluated included the wire gauge and configuration, the bearing plate loads and bolt spacing. The wire gauge of the tested screen was 4, 6, 8, 9 and 10. Maximum screen capacities for both load and displacement were developed for each of the wire gauge sizes along with the screen stiffness. This information can be used for screen selection and for the evaluation and determination of screen performance.
Keywords
Mining-industry; Ground-control; Ground-stability; Rock-falls; Rock-bursts; Rock-mechanics; Underground-mining; Injury-prevention; Accident-prevention; Coal-mining
Publication Date
20090222
Document Type
Conference/Symposia Proceedings
Fiscal Year
2009
NTIS Accession No.
NTIS Price
NIOSH Division
PRL
Priority Area
Mining
Source Name
2009 SME Annual Meeting and Exhibit, February 22-25, Denver, Colorado, Preprint 09-104
State
PA; CO
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