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.