MODIFIED BASIC ROCK MASS RATING (MBR)Cummings et al. (1982)
Kendorski et al. (1983)
RATING FOR INTACT ROCK STRENGTH
RATING FOR DISCONTINUITY DENSITY
THEORETICAL RELATIONSHIP BETWEEN RQD AND DISCONTINUITY SPACING
DISCONTINUITY CONDITION RATINGS
GROUNDWATER CONDITION RATINGS
MBR SUPPORT CHART FOR ISOLATED OR DEVELOPMENT DRIFTS
Penjelasan
BLASTING DAMAGE ADJUSTMENT
ADJUSTMENT FOR INDUCED STRESSES DUE TO MULTIPLE OPENINGS
FRACTURE ORIENTATION RATING
ADJUSTMENT FOR DISTANCE TO CAVE LINE
ADJUSTMENT FOR BLOCK/PANEL SIZE
MBR PERMANENT SUPPORT CHART FOR PRODUCTION
DRIFTS
PENJELASAN
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