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Σχεδιασμός υποστήριξης στοών παραγωγής του μεταλλείου Ολυμπιάδας με βάση γεωμηχανικά συστήματα ταξινόμησης βραχομαζών και υπολογιστικού μοντέλου

Brokos Georgios

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Summary

Τhe present master thesis pertains to the simulation of mine planning of Olympia’s mine with cut and fill stoping method, in order to study the response of the rock mass circumferentially but also within the orebody.This method, although it is one of the costliest methods is the optimal solution, for safety reasons, because of the geology that exists in the region, such as for environmental reasons because the mine is located around Natura 2000 area.Initially theoretical data are presented, concerning the mechanical behavior of the rock mass, around underground excavations. Then a more detailed presentation is performed for the backfill mining methods.Subsequently we present geological and geotechnical data of the studied area and also make a reference to the upward (down-top) backfill mining method that it is employed in Olympias mine in Calkidiki. The scope of work of this thesis is the influence of the backfill on the surrounding rock mass and the ore body itself. Four set of models have been created made with an equal number of numerical analyses for the predicted movements by the model.The results are presented in the form of charts and tables in order to make the required comparisons between models. It was found that smaller movements both in the ore and in regional rock mass are predicted by the models that use shotcrete for the temporary support of the drifts and stopes before the final installation of the backfilling material. Finally, the largest movements of the rock mass are presented in the models that do not use temporary supporting measures and are characterized by reduced mechanical strength of the backfill from 4MPa to 1MPa.

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