Q-System Presentation - Bushveld Conference - Nov - Geohart ...

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CASE STUDIES Barton Formulas : Equivalent Dimension = 2 * Q 0.4 Unsupported Span = 2 * ESR * Q 0.4 Hartman Modified Formulas : Equivalent Dimension = 1,56 * Q 0.3442 Unsupported Span = 1,56 * ESR * Q 0.3442
CASE STUDIES Bolt Length Design for Permanent Mine Openings From Barton et al : L = 2 + 0.15*B ESR Where, L - bolt length; B - excavation width; ESR (Excavation Support Ratio) - a value related to the intended use of the excavation and the degree of security, which is demanded of the system - For permanent mine openings the ESR = 1.6.
Page 1 and 2: Impala Platinum Limited Rock Engine
Page 3 and 4: 1. Introduction 2. Locality Plan 3.
Page 11 and 12: PROBLEM FOG FATALITY ANALYSIS 95% C
Page 13 and 14: PROBLEM FOG FATALITY ANALYSIS - BOU
Page 15 and 16: PROBLEM Q - SYSTEM APPLICABILITY TO
Page 17 and 18: CASE STUDIES Q - INDEX METHODOLOGY
Page 19 and 20: 10 LEVEL CROSSCUT 23 LEVEL CONVEYOR
Page 21 and 22: CASE STUDIES NO. 9-SHAFT9 10 LEVEL
Page 23 and 24: CASE STUDIES NO. 14-SHAFT 23 LEVEL
Page 25: CASE STUDIES Rock Mass Quality, Q,
Page 29 and 30: FOG Analysis : Conclusions • 95%

Q-System Presentation - Bushveld Conference - Nov - Geohart ...

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