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Yield pillar sizing: an empirical approach. With an appendix on the pillar size program.

Authors
Kneisley-RO; Rock-AD
Source
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9593, 1995 Jan; :1-29
Link
NIOSHTIC No.
10005498
Abstract
An empirical method, based on U. S. Bureau of Mines field studies in several Western U.S. coal mines, is presented for sizing gate road yield pillars. Discriminant analysis was used to generate functions separating successful from unsuccessful case studies. These functions relate the pillar width-height and extraction ratios and a pillar development factor to the Coal Mine Roof Rating System (CMRR), and are assumed to establish three criteria that other entry systems, under similar conditions, must satisfy. A program, Pillar Sizer, from user-provided inputs, generates a range of pillar sizes that meets the proposed criteria. Although the analysis is based on a sample consisting primarily of two-entry systems, the derived expressions generate pillar sizes closely agreeing with observed, two-entry and three-entry in situ pillars. It is concluded that the proposed approach should assist mine operators estimate entry system yield pillar dimensions.
Keywords
Mining-industry; Underground-mining; Mine-shafts; Ground-control; Analytical-processes; Computer-software; Computer-models
Publication Date
19950101
Document Type
Report of Investigations
Fiscal Year
1995
NTIS Accession No.
NTIS Price
Identifying No.
RI-9593
NIOSH Division
DRC
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, RI 9593
State
CO
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