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Design parameters of roof support systems for predriven longwall recovery rooms.

Authors
Tadolini-SC; Barczak-TM
Source
Trans Soc Min Metal Explor 2006 Jan; 318:87-96
NIOSHTIC No.
20030597
Abstract
Reduction in the recovery time required and improvements in safety during a longwall face move have compelled coal mine operators to examine and use predriven longwall recovery rooms. The recovery entry is developed at the longwall stop position and supported ahead of time so that the required combinations of standing and internal supports can be installed before the longwall face approaches. A calibrated three-dimensional finite-element model, developed in conjunction with an underground test area, provided the critical component and design principles for a comprehensive parametric study. The study indicates that vertical, horizontal, and shear stresses concentrated on the outby abutment pillar corner of the recovery room, resulting in deformations in the immediate roof above the primary roof support anchorage level. The results of the numerical model and field site observations indicated that the combination of the internal bolting system and the standing concrete supports are critical for the successful and safe extraction of the longwall equipment. Cable supports installed at and angled over the pillars can help stabilize the disturbed zone above the adjacent fender and outby pillars; however, standing supports are required in most sedimentary roof conditions to increase stability and assure a safe longwall extraction.
Keywords
Mining-industry; Coal-mining; Underground-mining; Longwall-mining; Ground-control; Ground-stability; Geology; Injuries; Safety-research
Contact
NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
CODEN
TMENAE
Publication Date
20060101
Document Type
Journal Article
Editors
Yernberg-WR
Fiscal Year
2006
NTIS Accession No.
NTIS Price
ISBN No.
0873352513
ISSN
1075-8623
NIOSH Division
PRL
Source Name
Transactions of the Society for Mining, Metallurgy, and Exploration
State
PA
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