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New approach to evaluate the stability of yield pillars.

Authors
Morsy-K; Peng-S
Source
Proceedings of the 22nd International Conference on Ground Control in Mining, August 5-7, 2003, Morgantown, West Virginia. Peng SS, Mark C, Khair AW, Heasley KA, eds., Morgantown, WV: West Virginia University, 2003 Aug; :371-377
Link
NIOSHTIC No.
20024635
Abstract
In this paper a new method to evaluate the stability of yield pillars was introduced. The evaluation of yield pillar stability was conducted in three steps: (1) Estimation of pillar loading numerical modeling is a good tool to estimate the pillar loading for most of the geological, geometrical and mining conditions. In this study, finite elemel1t technique was used to estimate the state of stress, strain, elastic strain energy and plastic energy, etc. at every point within the pillar. (2) Defining the yield pillar loading zones. The proposed method considered the non-uniform stress distribution of yield pillars by dividing the area of the yield pillar into three loading zones, namely core, transition and rib zones. (3) Estimation of stability indicators - an appropriate stability measure was proposed for each loading zone, such as; Core Stability Factor, CSF, Pillar Bump Index, PBI and Rib Instability Index, RIF. A case study of successful and unsuccessful yield pillar application was used to assess the applicability of the proposed method.
Keywords
Coal-mining; Mining-industry; Occupational-hazards; Engineering-controls; Engineering; Models; Case-studies; Rock-bursts; Rock-falls; Rock-mechanics; Geology; Ground-control; Ground-stability
Publication Date
20030805
Document Type
Conference/Symposia Proceedings
Editors
Peng-SS; Mark-C; Khair-AW
Funding Amount
328500
Funding Type
Grant
Fiscal Year
2003
NTIS Accession No.
NTIS Price
ISBN No.
0939084569
Identifying No.
Grant-Number-R01-OH-004238
Source Name
Proceedings of the 22nd International Conference on Ground Control in Mining, August 5-7, 2003, Morgantown, West Virginia
State
WV
Performing Organization
West Virginia University Research Corporation, Morgantown, West Virginia
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