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.

RQD stands for Rock Quality Designation, a geotechnical index to assess the fractured state and quality of a rock mass from drill core samples. 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.

To use the RQD Analysis option:

• You must have at least one (or more) Linear or Borehole Traverses defined (e.g., Linear Scanline, Linear Borehole Oriented Core, Linear Borehole Televiewer, Curved Borehole Oriented Core, Curved Borehole Televiewer).

If the above criteria are met, then the RQD option will be enabled.

To create a RQD Analysis chart:

1. Select Joint Analysis > RQD from the Analysis ribbon.
2. In the RQD Analysis dialog, select all or any combination of individual traverse(s) using the Traverses checkboxes. You can quickly select all or none using the Select All and Unselect All buttons.
At least one Traverse must be selected.
3. Select the Interval Type from the drop down as either Discrete or Moving.
4. Enter an Interval value.
5. Enter a Move Increment (if Interval = Moving).
6. Enter a Cut Off Length. Typically, 10 cm (4 inches) is used.
7. Click OK, and a graph of RQD along the length of the selected Traverse(s) will be plotted.