Dear colleagues!
What is the best method to determine In SItu Block Size Distribution if I have orientation, spacing and persistence data collected from 3D Point Cloud?
I considered using 3DEC but I am not very fluent in the software.
Hi Friend
I think you use the Rmi classified to detemine Vb.
Thanks
I think you have to work on the joints data, defining the family joints: average dip/dipdirection, variability, properties.
Thus, you can insert these properties into the code with "jset" command.
Read " Measurements of and correlations between block size and rock quality designation (RQD) " (Palmstrom 2005)
It depends on how you are measuring persistence.
If you use the standard 3DEC "persistece factor" (from 0.0 to 1.0), it is easy to calculate block sizes, volumes and etc. However, this factor is not a direct measurement obtained from rock outcrops; thus, you need to find an acceptable way to convert trace lenghts into "persistece factor".
I if you are using DFN-generated models, 3DEC must extend discintinuities to create blocks, thus you end up with smaller blocks with lower volumes. In this case, I recomend the SiroModel code (https://research.csiro.au/msci/projects/mining/siromodel/) which considers only the blocks fully cut by non-persistent discontinuities.
Dear Hrvoje,
3DEC is not an appropriate program to evaluate the block volume. It is recommended to use more appropriate procedures. See the following paper:
Article Spacing and block volume estimation in discontinuous rock ma...
Bests,
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