RQD (Rock Quality Designation)
Compute the RQD (Rock Quality Designation), R = (sum of core pieces ≥ 10 cm / total drilled length)·100%, an index of rock-mass quality obtained from drill-core logging. It measures the degree of fracturing: an RQD above 90% indicates excellent, intact rock; below 25%, heavily fractured, poor-quality rock. It underlies geomechanical classification (RMR, Q) in tunnels and slopes. Enter the sum of pieces ≥ 10 cm and the total length.
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RQD (Rock Quality Designation)
Quando se perfura uma sondagem, a rocha sobe em cilindros — os testemunhos. O RQD (Rock Quality Designation), criado por Deere em 1964, transforma o estado desses testemunhos num número: R = (soma dos pedaços ≥ 10 cm / comprimento total perfurado)·100%. Pedaços longos e intactos indicam rocha sã; muitos fragmentos curtos denunciam um maciço fraturado. A escala: RQD 90–100% é rocha excelente; 75–90% boa; 50–75% regular; 25–50% pobre; abaixo de 25%, muito pobre. O RQD é insumo das classificações geomecânicas RMR e Q, que orientam o suporte de túneis, a estabilidade de taludes e o projeto de fundações. Informe a soma dos pedaços ≥ 10 cm e o comprimento total.
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