It could be tons of topics depending on your personal interests, just to name some that I find interesting (numerical modeling related topics):
-Dynamic stability and damage of tunnels under strong earthquake motions
-Application of SRF method to assess the static stability of tunnels
-Comparison of limit equilibrium and Distinct element methods' performance to assess wedge instabilities.
-Blasting that could impact or reactivate nearby joints
-Performance of installed rockbolts under certain types of blasting
-Time-dependent effects on squeezing ground
-Statistical study of face tunnel stability
If you relate the above-mentioned ideas with mining engineering itself, you can end up having very specialized topics, with applications to block caving and open stope mining.
I hope you can find some inspiration in these vague ideas. Best regards,
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