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The adjusted RMR is 60 which is Class III “FAIR ROCK”. Based on the RMR rating...

The adjusted RMR is 60 which is Class III “FAIR ROCK”. Based on the RMR rating alone, a 12 m diameter tunnel being mined by drill and blast methods through this rock mass will have an approximate standup time of (a) 12 months or more (b) 1-week to 1-month (c) less than 1-week (d) less than 1-day

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Answer #1

Standup time is time for which rock can remains stable without any support after drill blast. It is generally based on Roof span. Roof span is distance between the nearest support to the face where excavation is going to done.

Based on RMR 60, this is fair rock and generally roof span is 10 m(standard value) Standup time is 1 week to 1 month measured from chart provided by beiniawski.

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