David is a principal geotechnical engineer with more than 20 years of operations and consulting experience in the mining and civil industries. Since joining Itasca in 2007, David has performed numerical back analyses and forward analyses for numerous open pit and underground mining operations around the world using Itasca software. David has also performed numerical analyses for several surface and underground civil infrastructure projects.
This hands-on, virtual training course is 16 hours total, spread over four days in a 1.5-week period, and covers the analysis of embankment dams using FLAC.
Mr Lachenicht has 25 years’ experience in mining geomechanics ranging from consulting, research projects, studies to mine operational experience. Over the course of his experience, positions held include manager, senior geotechnical engineer, geotechnical superintendent and principal geotechnical engineer roles with associated levels of responsibility.
In a previous post,
we showed an example of how a topography could be modeled in 3DEC using
the ‘octree’ approach. First, a geometry surface is imported (e.g., a
dxf file) and a small number of blocks are created. Then, each block
that is touching the geometry surface is split into eight smaller
blocks. This continues until there is a satisfactory representation of
the surface geometry (see the figure below). The downside of this
approach is that the ‘stair-step’ mesh is fairly unattractive and
sometimes there is spurious failure at the sharp corners of these cubic
blocks. It also can lead to a lot of blocks (26,000 in the plot below).
A much better representation of the surface can be obtained using
Kubrix Geo. This software can generate a tetrahedral mesh to match
exactly to a desired topography (or any other geometry). The advantage
of Kubrix is that it can mesh intersecting surfaces, tunnels, geological
units, and even non-planar faults.
However, if you are interested only in representing a topography, or
perhaps a few non-intersecting horizons, there is another way. You can
import the geometry surface and then extrude each polygon that makes up
the surface using the POLY PRISM command in 3DEC. This requires a bit of
FISH (see link below), but the result is worth it. You can see in the
plot below that not only is the surface much smoother than the octree
surface, there also are significantly fewer blocks (3,300 in the plot
below). The downside is that some of these blocks may have problematic
geometries (e.g., high aspect ratios). This can be mitigated somewhat by
ensuring that you have a good mesh and by making some horizontal cuts.
Identifying and dealing with bad blocks will covered in a future post.
Revised - July 02, 2016. Set atol to 0.1 to prevent geometry errors.
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