Need assistance with a RS2 Slope design - Blasted Pyroxenite being dumped down a slope

[Shawn van Wyk]

Hello,

I am tasked with assessing the slope stability of a chrome mine that is tipping blasted materials down the slope. The goal is to determine the critical span where possible failure could occur. (the maximum width/height they can tip to before the stability becomes compromised)

I have the original ground level and the tipped material layer plotted out, my question is how to simulate the blasted material properly? I am testing the model with various parameters but I am not sure which approach would be correct.

This is the current slope as is, I require assistance with how to approach simulating the blasted material, I was advised to use the original material properties for the Pyroxenite but to lower GSI to 25 and mi to 7 with a disturbance factor of 0.5 but the results I am getting when increasing the tipped-material dimensions (higher/wider out) are not consistent. I am also not sure if Hoek-Brown would be the correct criterion for the tipped material, I was thinking Mohr-coulomb?

Any assistance would be greatly appreciated.

 

[3DDave]

It is conventionally referred to as the angle of repose and conventionally depends on how fine the particles are relative to the height of the slope, how much moisture is present, and whether there is any notable vibration or seismic activity.

Look to landslide and avalanche criteria.

The typical low angle is 15º and the typical steep angle is 45º and I would expect this material to be somewhere in between.