Erdemli-Silifke-Taşucu tünel projesinin RMR ve Q tünel destek sistemleriyle incelenmesi üzerine bir çalışma

The natural rock mass, unlike other engineering materials, is formed in a specific geological setting and consists of different combinations of rocks and structural planes with varying properties. Due to the complexity of the rock mass, it is categorized into different classes based on rock mass quality and stability in accordance with engineering knowledge and experience. The geomechanically strength parameters required for tunnel projects are determined through geological assessments along the tunnel route and laboratory experiments. In order to mathematically model the behavior of rock masses, strength and deformation parameters are determined using relationships derived from rock mass rating systems, the concept of Geological Strength Index (GSI), and values found in literature. Variables for tunnel excavations and support system designs using empirical and analytical methods are identified by analyzing all the information gathered from the field. This study focuses on the agreement between a numerical model, developed to address stability issues encountered during the construction of the T-8 Tunnel, and the actual case. The finite element (FE) analysis method is employed to examine the model and support systems used in the rock masses between the T-8 Tunnel South Tube (Km: 175+640-175+950) and the T-8 Tunnel North Tube (Km: 175+700-176+084) sections of the Erdemli - Silifke - Taşucu 13th Zone. Geological and geotechnical studies were conducted during tunnel face excavations, resulting in the preparation of Tunneling Quality Index (Q) and Rock Mass Rating (RMR) rock classifications, as well as deformation measurements. The compatibility between predicted support systems in the numerical model and the actual implementation is analyzed. Tunnel support systems are determined based on existing geological and geotechnical data. It has been observed that the estimated model is compatible with the geological structure encountered during excavation and is supporting the construction. Since no revision was required in the support systems envisaged during the tunnel excavation, the numerical model was validated and found to be successful. Keywords: Tunneling, rock classifications, tunnel support systems, numerical modeling.