Ph.D. Tezi Görüntüleme

      This study was carried out in two stages including in-situ and laboratory studies in Cankurtaran and Salmankas Tunnels. In the field studies, L and N-type Schmidt hammer measurements were taken from 28 different excavation faces and RMR classification of geotechnical units was calculated. Moreover, time dependent current variation were investigated on drill Jumbo machines with a pensampermetre for the first time, specific energy (kWh/m3) and net excavation rate (m3/h) values were calculated for 20 different excavation face. To determine the drill bit life, measurements were realized on Atlas Copco ROCKET-BOOMER 282, Sandvik DD320 and Tamrock AXERA6 Jumbo machines from 84 excavation faces with 33 drill bits and 25 of drill bits were ballistic, 6 of bits were spherical and 2 of bits were semi-ballistic. Wear types of bits were also investigated. Two new wear types were encountered which are namely split of bit shaft and break on drifter rod. Samples were obtained from the Cankurtaran tunnels and Salmankas tunnels respectively 33 and 10 samples at the different excavations face for the laboratory studies. Drillability, abrasiveness, physic- mechanical and mineralogical properties were investigated on rocks samples obtained at the tunnels. Equivalent Quartz Content (EQU) was determined with the help of thin section analysis. As a result, the correlation of the data obtained is analyzed and results have been statistically evaluated.