Abstract
The height of the section of the right portal structure, Vranduk tunnel, starts at 337.24, while the height of the left side starts at 331.74. The projected level of the right tunnel pipe is at 315.24, which means that it is necessary to excavate 22m' of the right and 16.50m' of the left slope. Excavation work was carried out using a combination of mechanical excavation and blasting. Excavation with a hydraulic excavator to a height of 10-11m' to the level of the tunnel was not economically acceptable because it was a rock mass of considerable hardness with an average uniaxial strength of qu=45 MPa. The main task and the biggest challenge during the excavation by blasting the rock mass at the intersections is the determination of the drilling and mining parameters that will ensure as little damage as possible to the depth of the contour part of the rock mass, and reduce all potential harmful effects of blasting to a minimum. This paper describes the determination of drilling and mining parameters during the excavation of the entrance portal of the right tunnel pipe of the "Vranduk" tunnel on the Vc corridor.
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