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Pillar strength and design methodology for stone mines.

Authors
Esterhuizen-GS; Dolinar-DR; Ellenberger-JL
Source
Proceedings of the 27th International Conference on Ground Control in Mining, July 29-31, 2008, Morgantown, West Virginia. Peng SS, Mark C, Finfinger GL, Tadolini SC, Khair AW, Heasley KA, Luo-Y, eds., Morgantown, WV: West Virginia University, 2008 Jul; :241-253
NIOSHTIC No.
20034271
Abstract
Underground stone mines in the United States make use of the room-and-pillar method of mining. A prerequisite for a safe working environment is that the pillars should adequately support the overburden and the pillar ribs and rooms should remain stable during mining. At present pillar dimensions are either based on experience at neighboring mines or on strength equations that were developed for metal or non-metal mines. This paper presents a pillar design methodology that was developed from a study of pillar performance in operating stone mines. Data were collected that describe the rock mass quality, pillar conditions, mining dimensions and intact rock strength. The results showed that current mining practices have resulted in generally stable pillar layouts with no recent cases of extensive pillar collapses. However, a small number of single failed or failing pillars were observed in otherwise stable layouts. Numerical analyses were used to supplement the observations and develop a pillar strength equation that describes the stable and small number of failed pillars observed. The developed strength equation can be used to design stable pillar layouts provided the factor of safety is greater than 1.8 and the width-to-height ratio of the pillars is greater than 0.8. The paper concludes with guidelines for applying the developed equation and selecting appropriate input parameters.
Keywords
Ground-control; Ground-stability; Mining-industry; Underground-mining; Mine-shafts; Stone-mines; Room-and-pillar-mining
Publication Date
20080729
Document Type
Conference/Symposia Proceedings
Editors
Peng-SS; Mark-C; Finfinger-GL; Tadolini-SC; Khair-AW; Heasley-KA; Luo-Y
Fiscal Year
2008
NTIS Accession No.
NTIS Price
ISBN No.
9780978938338
NIOSH Division
PRL
Priority Area
Mining
Source Name
Proceedings of the 27th International Conference on Ground Control in Mining, July 29-31, 2008, Morgantown, West Virginia
State
PA; WV
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