Geological Strength Index GSI Calculator

Estimate the Hoek Geological Strength Index from the 1976 Rock Mass Rating using the published relation GSI = RMR76 - 5 (valid for RMR76 > 23).

Description

Estimate the Hoek Geological Strength Index from the 1976 Rock Mass Rating using the published relation GSI = RMR76 - 5 (valid for RMR76 > 23).

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