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Analysis and design considerations for superimposed longwall gate roads.

Authors
Chekan-GJ; Listak-JM
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9305, 1992 Jan; :1-14
NIOSHTIC No.
10011183
Abstract
The U.S. Bureau of Mines is investigating longwall panel layouts to maximize coal recovery and minimize interactive problems in multiple-seam operations. When coalbeds are longwall-mined in descending order, the transfer of stress from overlying gate roads is a major design constraint affecting pillar stability in the lower mine. The lower mine gate road pillars must be properly designed to withstand the additional load transfer if gate roads are superpositioned in successive seams. The Bureau's MULSIM/NL model, a boundary element computer program, was used to analyze load transfer mechanics for superpositioned gate road pillars. Analysis of longwall pillar stability (ALPS), an empirically based design method for longwall gate road pillars, was used to calibrate model input parameters. ALPS provided a basis to verify model trends and to recommend limits for safe pillar design when superpositioning longwall gate roads. The attributes of the MULSIM/NL model and ALPS were combined to develop a modified method for estimating pillar stress for multiple-seam cases. The modified method uses a multiple-seam factor (MS) to estimate the stress on superpositioned lower mine gate road pillars. Numerical analysis shows that MS depends on the interburden thickness and pillar width.
Keywords
Mining-industry; Underground-mining; Coal-mining; Mine-safety; Ground-control; Longwall-mining
Contact
Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
Publication Date
19920101
Document Type
IH; Information Circular
Fiscal Year
1992
NTIS Accession No.
PB92-169986
NTIS Price
A03
Identifying No.
IC-9305
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9305
State
PA
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