MODIFIED BASIC ROCK MASS RATING (MBR)Cummings et al. (1982)

Kendorski et al. (1983)

PARAMETER YANG DIGUNAKAN

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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