News & Events
VIDEO: Meet PhD Candidate Yousef Abolfazlzadeh
My name is Yousef Abolfazlzadeh
I'm a PhD candidate in mining engineering
at Queen's University. Currently I am working
in the geo-mechanical lab of
Dr McKinnon at Queen's University
and we do lots of wonderful work here
we have access to many geo-mechanical
software such as Itasca, Rocscience and
ESG Solutions package.
So, briefly, my project is about mapping a stress
field using seismic stress inversion
As you know, the factor of safety is
defined as the ratio between the strengths
and the stress, so we know reasonably well about
the strengths of a rock mass from the classification
but generally we do not know well about the stress
So, geological structures such as fault can affect
stress in a volume. The traditional methods of
stress determination have some problems for finding
the exact value and orientation of the principal
stresses because they are just point measurements.
We use the seismic stress inversion to locally
The way that we work is like this. We have the ESG
package and then the plot of the seismic events
which are very small earthquakes.
So, as you can see, here we have the ore body in
a mine and we have the different levels of that
then I want to show you the events that we have
for a year. These dots, purple ones, blue and yellow,
are seismic events. Also, we have access to the waveforms
of the seismic events from which we can clear the data
about the waveforms first by filtering them and removing
the ambient and cultural noises around the blast
and after that we use the polarities of the P-waves and
we plot them on a lower hemisphere, then we will find
the orientation of the principal stresses.
As you see, it's a pretty exciting project and finally
I want to say that I feels like Queen's is my home and
give it a shot.