Dr. Sharrock has 15 years industry experience in a wide range of rock mechanics positions such as Principal Geotechnical Engineer (Newcrest Mining NL), Rock Mechanics Engineer (Mt Isa Mines), Senior Geotechnical Consultant (AMC Consultants), Senior Lecturer in Geotechnical Engineering (UNSW) and Associate Professor - Caving Geomechanics (UQ).
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.
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.
In 3DEC, it is easy to see if joints have failed by plotting Joints – Slip.
This will plot small cubes at each subcontact colored by their state
(slipping, slipped in past, or failed in tension). However, it is not so
easy to find the joints that are close to failure but have not
yet failed. You could run a factor of safety analysis to find the
critical joints, but this can be very slow for large 3D models. Another
alternative is to plot the strength-stress ratio on each joint.
The strength-stress ratio is the shear strength of the joint divided
by the current shear stress, which means large numbers indicate low
stress and safe joints. But as the stress approaches the strength, the
ratio will approach 1—just like a factor of safety. You could even just
solve your model elastically (solve elastic only), and then plot the strength-stress ratio to observe potential problem areas before you even run any more calculation steps!
A FISH function is provided below to enable the plotting of
the shear strength-stress ratio for joints. Simply run the function and
then plot Joints – Contours – Subcontact Extra. Since the joint contour plots do not have a wireframe (yet), it is helpful to plot Joints
on top and turn off the fill so you can get some depth perception in
3D. You could also plot the contours in a reverse green-red color scheme
with a modified maximum and minimum (say, 1.0 to 1.5) so that the green
areas show as safe and the red areas are the problem areas. An example
jointed slope model is shown below.
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