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Coal Pillar Strength Study (The Design of Production Pillars in Coal Mines).

Authors
Pariseau-WG; Hustrulid-WA; Swanson-SR; Van Sambeek-LL
Source
NTIS: PB 274-900 Available for Reference At Bureau Libraries :442 pages
Link
NIOSHTIC No.
10000860
Abstract
Laboratory tests for unconfined compressive strength and young's modulus on 371 test cylinders of coal at length-to-diameter ratios of 1/2, 1, 1-1/2, and 2, and nominal diameters of 1, 2, 4, 6, 8, and 12 inches are reported. Field measurements at 117 closure pin stations and 119 vibrating wire stress gage sites in the vicinity of two 60- by 60-foot test pillars separated by 20-foot entries and crosscuts show approximately 1 to 2 inches closure and 2,000 to 4,000 psi stress change prior to mining of the pillars to failure. Finite element analysis of the test section from development through pillar mining and retreat using laboratory rock properties as input shows good agreement with the measured closures.
Publication Date
19770101
Document Type
CP; Final Contract Report;
Fiscal Year
1977
NTIS Accession No.
PB-274900
NTIS Price
A20
Identifying No.
OFR 166-77
NIOSH Division
DRC;
Source Name
NTIS: PB 274-900 Available for Reference At Bureau Libraries
State
UT;
Performing Organization
University of Utah
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