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What is RQD (Rock Quality Designation) and How to Calculate it? Rock Quality Designation (RQD) is a measure of quality of rock core taken from a borehole RQD signifies the degree of jointing or fracture in a rock mass measured in percentage, where RQD of 75% or more shows good quality hard rock and less than 50% show low quality weathered rocks
Rock Quality Designation - an overview | ScienceDirect Topics Rock quality designation (RQD) is a standard technique in the mining industry for the qualitative and quantitative assessment of rock quality and degree of jointing, fracturing, and shearing in a rock mass