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A unique approach to determining the time dependent in situ strength of coal pillars.

Authors
Biswas-K; Mark-C; Peng-SS
Source
1999 SME Annual Meeting, March 1-3, 1999, Denver, Colorado, Preprint 99-184. Littleton, CO: Society for Mining, Metallurgy, and Exploration, 1999 Mar; :1-7
Link
NIOSHTIC No.
20027592
Abstract
In general, it cannot be assumed that the strength of coal pillars remains constant over long time periods. Field observations indicate that a coal seam, especially when it contains a parting layer, deteriorates over time, reducing load-bearing capacity of the pillars. This paper discusses a unique approach to determine the time dependent strength of coal pillars in the field. Three coal pillars that were developed 5, 15 and 50 years ago were chosen for the study. Holes were drilled in coal and parting layers in each pillar and the strength profiles were determined for each hole using the Borehole Penetrometer. The strength data were treated statistically to establish time dependent strength equations for different layers. The results can be used to help estimate the loss of pillar capacity over time.
Keywords
Mining-industry; Underground-mining; Room-and-pillar-mining; Ground-control; Ground-stability; Statistical-analysis; Longwall-mining; Extended-cut-mining
Publication Date
19990301
Document Type
Conference/Symposia Proceedings
Fiscal Year
1999
NTIS Accession No.
NTIS Price
NIOSH Division
PRL
Source Name
1999 SME Annual Meeting, March 1-3, 1999, Denver, Colorado, Preprint 99-184
State
PA; CO; WV
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