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Analysis of pillar design practices and techniques for U.S. limestone mines.

Authors
Iannacchione-AT
Source
Inst Min Metall, Trans, Sect A: Min Ind 1999 Dec; 108():A152-A160
NIOSHTIC No.
20022108
Abstract
Underground stone mining is an emerging sector of the U.S. mining industry. As this expansion takes mines under deeper cover, and as more efficient mining methods are utilized, effective stone pillar design methods will become even more important. Current design practices are examined and a discussion of safe mine layouts is presented as a first approach towards weighing the demands for increased production against increased risk. Risks to underground stone-mine workers include rib instabilities, pillar failures and roof falls. Seventy-two stone-mine pillar designs were examined. Pillars with width to height ratios of less than 1.5 appear more likely to fail when subjected to excessive stress levels. When width to height ratios fall below 1.0, defects in the pillars, such as through-running discontinuities, can have a significant influence on stability. Discontinuity persistence, dip, material properties and orientation are also important determining factors in pillar strength.
Keywords
Mine-workers; Mining-industry; Miners; Accident-prevention; Accident-analysis; Accidents; Underground-mining; Underground-miners
CODEN
TIMNAQ
Publication Date
19991201
Document Type
Journal Article
Fiscal Year
2000
NTIS Accession No.
NTIS Price
ISSN
0371-7844
NIOSH Division
PRL
Priority Area
Control Technology & Personal Protective Equipment; Research Tools and Approaches
Source Name
Transactions. Section A, Mining Industry / Institution of Mining & Metallurgy
State
PA
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