Rock Quality Designation (RQD) is a rough measure of the degree of jointing or fracture in a rock mass.

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Rock quality designation

"RQD is a technique designed by geologists to determine qualitative information so that engineers can do mathematics."

RQD should be estimated:

- For classification of shear strength.
- For estimates of rock blasting requirements.

Formula for Rock Quality Designation:

RQD =
(SUM {sound piece length> 100 mm} / total core run length) x 100

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