Accounting For Micro-Defects In Rock Mass Rating

In 2001, Laubscher’s Mining Rock Mass Rating (MRMR) classification system (Laubscher and Jakubec, 2001) introduced the rock block strength concept to account for scale effects and the influence of closed defects on intact rock strength (IRS). Almost two decades later, rock mechanics practitioners are still challenged by how to appropriately incorporate defects, other than open

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