Applying the Extended Mathews stability graph to stress relaxation, site specific effects and narrow vein stoping

Stewart, Penny and Trueman, Robert (2003). Applying the Extended Mathews stability graph to stress relaxation, site specific effects and narrow vein stoping. In: B.K. Hebblewhite, Ground control in mining : technology & practice : proceedings of the inaugural conference of the Australasian Mining Rock Mechanics Society, held by the School of Mining Engineering, UNSW, in conjunction with the Eastern Australia Ground Control Group. 1st Australasian Ground Control in Mining Conference - Ground Control in Mining: Technology and Practice, Scientia, UNSW, (55-61). 10-13 Nov, 2003.

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Author Stewart, Penny
Trueman, Robert
Title of paper Applying the Extended Mathews stability graph to stress relaxation, site specific effects and narrow vein stoping
Conference name 1st Australasian Ground Control in Mining Conference - Ground Control in Mining: Technology and Practice
Conference location Scientia, UNSW
Conference dates 10-13 Nov, 2003
Proceedings title Ground control in mining : technology & practice : proceedings of the inaugural conference of the Australasian Mining Rock Mechanics Society, held by the School of Mining Engineering, UNSW, in conjunction with the Eastern Australia Ground Control Group
Place of Publication [N.S.W.]
Publisher UNSW School of Mining Engineering
Publication Year 2003
Sub-type Fully published paper
ISBN 0733420850
9780733420856
Editor B.K. Hebblewhite
Start page 55
End page 61
Total pages 7
Language eng
Abstract/Summary The original Mathews method for predicting stope stability has been extended and now contains 483 open stoping and caving case histories over a wide range of geotechnical conditions and stope dimensions. The mathematical framework upon which the Extended Mathews stability graph is based and the large database has facilitated examination of a number of outstanding issues surrounding the application of empirical stability graphs. This paper summarises how the framework of the Extended Mathews stability graph framework has been applied to quantify the effect of stress relaxation upon excavation stability, examine site-specifi c effects and highlight the poor correlation between stability graph parameters for narrow stope stability. Back-analysis of case studies where stope surfaces were relaxed has enabled the effect of stress relaxation upon excavation stability to be quantified and bounded. Detailed statistical analyses have demonstrated that a reliable stable-failure boundary requires at least 150 case histories, of which a minimum of 10% should be unstable stope surfaces. Marginal site-specifi c effects were observed for the operating conditions captured within the database. Apparent site-specifi c effects noted in previous literature were found to be attributable to operating conditions inadequately represented in the database. Statistical analysis of overbreak from 115 narrow-vein case studies has demonstrated that operating conditions in narrow-vein mines differ suffi ciently to warrant changes in the model framework to account for undercutting of stope walls and drill and blast parameters. Backfi ll abutments were found to behave the same as solid rock abutments.
Subjects E1
0601 Biochemistry and Cell Biology
0904 Chemical Engineering
Keyword Mathematical framework
Stope
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Tue, 02 May 2006, 22:50:32 EST