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VIDEO: Meet PhD Candidate Yousef Abolfazlzadeh


Video transcript:

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

find stress.

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.