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A company is requested to assess rock mass condition in a newly exposed surface of an underground tunnel. The tunnel is excavated in sandstone

A company is requested to assess rock mass condition in a newly exposed surface of an underground tunnel. The tunnel is excavated in sandstone by tunnel boring machine with excellent condition. The rock mass has a GSI of 72, intact compressive strength of 86MPa and Hoek-Brown intact rock mass constant mi of 20. Determine the rock mass 'global' compressive strength in MPa using Marinos-Hoek equation.

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