Discussion
Rock quality designation is computed from a core run as the percentage of
Answer: A
Correct answer: intact pieces longer than 100 mm
Rock quality designation is
\[ RQD = \frac{\sum(\text{intact pieces} \geq 100\ \text{mm})}{\text{total run length}} \times 100 \]measured along the core axis. The 100 mm threshold is arbitrary but standard, and the index is a simple measure of how closely fractured the rock mass is. It ignores everything else - joint orientation, roughness, infill - which is why it is only one input to the fuller rock mass classifications.
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