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RQD Analysis

The RQD Analysis option allows you to calculate the Rock Quality Designation (%) calculated from distance measurements recorded along a linear or borehole Traverse. When adjacent distance measurements between joints are less than or equal to 10 centimetres (metric) or 4 inches (imperial), that length is flagged as "poor quality". RQD is a measure of the percentage of core length pieces which are greater than this cutoff value, relative to the total measured interval.

In order to use the RQD Analysis option:

  1. You must have at least one (or more) Linear or Borehole Traverses defined (e.g. Linear, Linear BH Oriented Core, Linear BH Televiewer, Curved BH Oriented Core, Curved BH Televiewer).
  2. The Distance Column must be enabled (checkbox in Project Settings) and Distance values entered in Grid Data view.
  3. If the above 2 criteria are met:

  4. Select RQD Analysis from the Analysis menu.
  5. In the RQD Analysis dialog:
    • Select all or any combination of individual Traverse(s). You can quickly select all or no Traverses using the Select All Select All icon / Deselect All options.
    • At least one Traverse must be selected.
    • Select the Interval as either Discrete or Moving.
    • Enter an Interval Value.
    • Enter a Move Increment (if Interval = Moving).
    • Select OK and a graph of RQD along the length of the selected Traverse(s) will be plotted.
The RQD Analysis option does not currently account for intervals of lost or damaged core, it is assumed that distance readings are from continuous, intact measurements.
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