Poşluk, EvrenKorkanç, Mustafa2024-11-072024-11-0720181016-9172https://doi.org/10.24232/jmd.486013https://hdl.handle.net/11480/11152Rock mass classification systems are used for rock mass characterization and design in the preliminary stages of many mining activities and engineering applications. There are theoretical and experimental methods for the prediction of tunnel boring machine (TBM) performance in project stage. The correct estimation of machine performance is influenced by many input parameters of rock mass, and although it is relatively easy to predict machine performance in isotropic intact rock environments, it is very difficult in poor rock having anisotropic behaviour. Many studies in this area have shown a poor relationship with penetration and rock mass classifications. In this study, the performance analysis of TBM in anisotropic weak rock environment with the QTBM method, which is used in the Tunnel No. 26 (between Bilecik and Bozuyuk), located in the Ankara-İstanbul high-speed train line, has been examined in the section until the machine is trapped in the tunnel. It is concluded that there exist problems for the anisotropic weak rocks in the QTBM method. It is extremely difficult to estimate the intermittent disk change time interval in such environments, and the relationship between properties of anisotropic rock mass and machine characteristics should be considered together for the performance machine prediction. © 2018, TMMOB - Jeoloji Muhendisleri Odasi. All rights reserved.trinfo:eu-repo/semantics/openAccessAdvance rateAnisotropyQ_TBMTBM performanceTunnelWeak rockArticle42214315810.24232/jmd.4860132-s2.0-85070731835Q4