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Roof span design for underground stone mines.

Authors
Esterhuizen-E; Dolinar-D; Ellenberger-J
Source
Proceedings of the 29th International Conference on Ground Control in Mining, Morgantown, West Virginia, July 27-29, 2010. Barczak T, ed., Morgantown, WV: West Virginia University, 2010 Jul; :318-324
NIOSHTIC No.
20037620
Abstract
Underground stone mines in the United States use the room-and- pillar method of mining. The stability of the roof between pillars determines the mining dimensions and size of equipment that can be used. The findings of a survey of roof span stability issues and design practices are presented, and the observed factors contributing to roof instability are discussed. Identified stability issues are evaluated, such as maximum roof span, horizontal stress, and roof beam stability. The results of field observations, roof monitoring, and numerical analyses are used in the evaluation. The importance of the first roof beam thickness and its impact on roof stability and support requirements is presented. An evaluation of the current experience with stone mine roof spans relative to international experience is presented. A step-by-step design procedure is suggested which emphazises the need to collect adequate geotechnical data, understand the immediate roof stability, select a mining direction, and meet support requirements.
Keywords
Underground-mining; Mining-equipment; Mining-industry; Ground-control; Ground-stability; Stone-mines; Geology
Publication Date
20100727
Document Type
Conference/Symposia Proceedings; Book or book chapter
Editors
Barczak-T
Fiscal Year
2010
NTIS Accession No.
NTIS Price
ISBN No.
9780978938338
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
Proceedings of the 29th International Conference on Ground Control in Mining, Morgantown, West Virginia, July 27-29, 2010
State
WV; PA
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