Assessment of Tunnel Stability and Determination of Tunnel Support Systems for a Segment (KM:90+222.10-93+435.70) of Afyonkarahisar – Burdur Railway Line

Date

2023-8-31

Author

Türköz, Nazlı Deniz

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Afyonkarahisar – Burdur Railway is located at the connection of Eskişehir – Kütahya – Antalya Railway and Zafer Airport. A tunnel is planned to be constructed as sixth of the eight tunnels within the scope of Afyonkarahisar – Burdur Railway Project between the kilometers of 90+222.10 – 93+435.70. The length and width of the tunnel is 3213,6 m and 13,30 m respectively. In this thesis, classification of the rock mass and determination of engineering parameters and support systems of the Tunnel-6 in Afyonkarahisar – Burdur Railway line were carried out. The main lithology along the tunnel is limestone. Tunnel-6 was divided into 3 critical sections as entrance portal, tunnel axis and exit portal. Rock mass classification systems (RMR, GSI, Q and NATM) were used for classification of rock mass along the tunnel and rock mass strength parameters and appropriate support systems were determined. NATM class was determined as B3 along the tunnel. Rock bolt with a diameter of 28 mm and a length of 6 m, shotcrete with 20 cm thickness, double layer wire mesh, I160 type steel rib and forepole with a length of 4 m were suggested for the tunnel for B3 class. In order to verify the determined support systems, numerical analyses were performed by using RS2 software. As a result of the numerical analyses, deformations in the tunnel are found to be acceptable with the applied supports.

Subject Keywords

Numerical Modeling, Rock Mass Classification Systems, Support Systems, Limestone, Afyonkarahisar – Burdur

URI

https://hdl.handle.net/11511/105402

Collections

Graduate School of Natural and Applied Sciences, Thesis