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Investigation of the stability of a pillar retreat section at the Fletcher Mine.

Authors
Tesarik-DR; Seymour-JB; Martin-LA; Jones-FM; Yanske-TR
Source
Proceedings of the 25th International Conference on Ground Control in Mining, August 1-3, 2006, Morgantown, West Virginia. Peng SS, Mark C, Finfinger GL, Tadolini S, Khair AW, Heasley KA, Luo Y, eds., Morgantown, WV: West Virginia University, 2006 Aug; :374-381
Link
NIOSHTIC No.
20031357
Abstract
Researchers nom the National Institute for Occupational Safety and Health (NIOSH), together with employees from The Doe Run Company, are monitoring and evaluating the stability of a pillar retreat section at the Fletcher Mine, a lead/zinc, room-and-pillar mine near Bunker, MO. Cemented rockfill is being used to provide roof support as high-grade, remnant ore pillars are mined. Earth pressure cells and deformation meters placed in backfill panel pillars monitor stress change and vertical deformation, respectively, as nearby ore-bearing pillars are extracted. Similarly, biaxial stressmeters and borehole extenso meters are used to monitor mining-induced stress change and deformation, respectively, in long-term support pillars. Data from these instruments indicate that when ore-bearing pillars were mined, stress was redistributed from support pillars to a backfill panel pillar. The data also indicate that the backfill and support pillars have remained stable for two years after pillar extraction was completed in the area. This research demonstrates the importance of using reliable instruments to document the geomechanical behavior of pillars and backfill. Gaining a better understanding of roof support and stress redistribution mechanisms is a fundamental part of NIOSH's goal to reduce and/or predict rockfalls, which are still among the leading causes of injuries in metal/nonmetal underground mines.
Keywords
Geology; Ground-control; Ground-stability; Mining-industry; Underground-mining; Coal-mining; Coal-miners; Underground-miners; Miners; Room-and-pillar-mining
Publication Date
20060801
Document Type
Conference/Symposia Proceedings
Editors
Peng-SS; Mark-C; Finfinger-GL; Tadolini-SC; Khair-AW; Heasley-KA; Luo-Y
Fiscal Year
2006
NTIS Accession No.
NTIS Price
ISBN No.
0939084569
NIOSH Division
SRL
Source Name
Proceedings of the 25th International Conference on Ground Control in Mining, August 1-3, 2006, Morgantown, West Virginia
State
WA; WV; CO
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