Akademik Veri Yönetim Sistemi
18th International Multidisciplinary Scientific Geoconference, SGEM 2018, Albena, Bulgaristan, 2 - 08 Temmuz 2018, cilt.18, ss.763-770
© SGEM2018.Zigana Tunnel is a new constructing tunnel, which will be the second in the world, and the longest in Europe, on the Gümüşhane-Trabzon highway. Two tunnels are being constructed between the Köstere village of Gümüşhane and the Başarköy village of Maçka district of Trabzon, each 14.5 kilometers long and 29 kilometers in length. The study theme is the reasons for the small scale collapse in the Zigana Tunnel Köstere Mevkii construction site; the location and size of possible fractures and/or cavity are investigated in the tunnel between 13km + 833 m and 13km + 783 m. The main aim of the study is to reveal the causes of collapse and to investigate whether a possible problem persists. For this purpose, ground penetrating radar (GPR) data were gathered on the inner wall and floor, processed and evaluated using a 50MHz unshielded and 250 MHz shielded antennas with RAMAC CII system, which can provided information about 45m forward depth on profiles formed on 2m intervals on the tunnel inner wall and 12m down depth on profiles gathered on the tunnel floor. In data processing, deconvolution and F-K filter were applied after traditional data processing which were move start time, dewow, background removal, bandpass filter. The background of the dent was displayed and the possible weak zones including transversal and longitudinal large fractures were identified successfully and the type of weak region was mapped. The result showed that GPR method was a non-destructive and most suitable method to map geological discontinuities to take precautions before during construction of a tunnel.