BLASTING TECHNOLOGIES FOR THE EXCAVATION OF THE EVACUATION TUNNEL VRANDUK II ON THE MAIN ROAD M-17

Tunel Vranduk II nalazi se na glavnom putnom pravcu grada Zenice, na magistralnoj cesti M-17, dionica Topčić polje – Lašva 0 ukupne dužine 1.062m. Paralelno sa glavnom tunelskom cijevi, kopana je servisna cijev na osnoj udaljenosti od 25 metara i poprečni prolazi iz servisne cijevi u glavnu tunelsku cijev (3 poprečna prolaza). Ukupna dužina evakuacijskog tunela iznosi 856,70 m. Radovi na iskopu izvedeni su kombinacijom miniranja i strojnim iskopom. Iskop je vršen uglavnom u sedimentnim stijenama uz primjenu klinastog i paralelnog zaloma. Učinak miniranja uz primjenu klinastog zaloma znatno je pogodniji i primjereniji za iskop u uslojenoj stijenskoj masi od miniranja paralelnim zalomom.The Vranduk II tunnel is located on the main road route of the City of Zenica, on the main road M-17, section Topčić Polje - Lašva 0 with a total length of 1,062 m. A service tube at an axial distance of 25 meters and cross passages from the service tube to the main tunnel tube (three cross passages) were excavated in parallel with the main tunnel tube. The total length of the evacuation tunnel is 856.70 m. Excavation works were carried out by a combination of blasting and machine excavation. The excavation was performed mainly in sedimentary rocks with the use of wedge and parallel cut. The effect of blasting with the application of wedge cut is much more suitable and appropriate for excavation in a stratified rock mass than blasting with parallel cut