BİR TÜNELDE PORTAL VE TÜNEL STABİLİTESİ İLİŞKİSİ (ANKARA-SİVAS YÜKSEK HIZLI DEMİRYOLU PROJESİ, T3 TÜNELİ)
Son yıllarda hızlı bir gelişim gösteren ulaşım ağı projeleri kapsamında inşa edilen tünellerin en
çok karşılaşılan sorunlarından biri portal şevlerinin duraylılığıdır. Portal şevlerinde meydana
gelen yenilmeler zaman zaman tünelde de duraylılık problemlerine sebep olmakta ve sorunu
büyütmektedir. Bu çalışma kapsamında, buna tipik bir örnek olan Ankara-Sivas Yüksek Hızlı
Tren projesi kapsamında inşa edilen T3 Tünelinde meydana gelen yenilme incelenmektedir.
Tünel kazısı devam ederken, çıkış portal kesimi şevlerinde çatlaklar meydana gelmiş ve
aynı zaman da tünel gövdesinde de göçük meydana gelmiştir. Bu çalışma kapsamında hem
göçen kesimin güvenle tekrar kazılması için sayısal analizler ile önerilen yeni destek sistemleri
değerlendirilmekte, hem de portal kesiminde şev duraylılığının sağlanması için gerekli analizlerin
yapılması ve sonuçların performansı tartışılmaktadır. Buna ek olarak, çalışmada genel olarak
tünel portal kazısı ile tünel içi tahkimat sistemlerinin etkileşimi tanımlanarak, bu tür tünel
çalışmaları için bir prosedür önerilmektedir.
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- Akgün, H., Muratlı, SW., Koçkar, M.K., 2014.
Geotechnical Investigations and Preliminary Support
Design for the Geçilmez Tunnel: A Case Study Along the
Black Sea Coastal Highway, Giresun, Northern Turkey.
Tunnelling and Underground Space Technology, 40,
277 – 299.
- Aygar, E.B and Gokceoglu, C., 2020. Problems
Encountered During a Railway Tunnel Excavation
in Squeezing and Swelling Materials and Possible
Engineering Measures: A Case Study from Turkey.
Sustainability, 12, 1166.
- Ayoublou, F., Taromi, M., Eftekhari, A., 2019. Tunnel
Portal Instability in Landslide Area and Remedial
Solution: A Case Study. Acta Polytechnica, 59(5), 435–
447.
- Fugro Sial Yerbilimleri, 2015. Ankara-Sivas Hızlı Tren
Demiryolu Projesi Yerköy-Yozgat-Sivas Arası, T3
Tüneli (Km: 293+375 - 293+400) Arasında Meydana
Gelen Göçük Değerlendirme Raporu.
- Geniş, M., 2010. Assessment of the Dynamic Stability
of the Portals of the Dorukhan Tunnel Using Numerical
Analysis. International Journal of Rock Mechanics &
Mining Sciences, 47, 1231–1241.
- Kaya, A., Akgün, A., Karaman, K., Bulut, F., 2016.
Understanding the Mechanism of Slope Failure on
a Nearby Highway Tunnel Route by Different Slope
Stability Analysis Methods: A Case From NE Turkey.
Bull Eng Geol Environ, 75, 945–958.
- Kaya, A., Karaman, K., Bulut, F., 2017. Geotechnical
Investigations and Remediation Design for Failure
of Tunnel Portal Section: A Case Study in Northern
Turkey. Journal of Mountain Sciences, 14 (6), 1140 –
1160.
- Khan, R.M.A., Mad, Z., Jo, B., 2019. Tunnel Portal
Construction Using Sequential Excavation Method: A
Case Study. Acta Polytechnica, 59(5), 435–447.
- Koçkar, M.K., Akgün, H., 2003. Methodology for Tunnel
and Portal Support Design in Mixed Limestone, Schist
and Phyllite Conditions: A Case Study in Turkey.
International Journal of Rock Mechanics & Mining
Sciences, 40, 173 – 196.
- Komu, M.P., Guney, U., Kilickaya, T.E., Gokceoglu, C.,
2020. Using 3D Numerical Analysis for the Assessment
of Tunnel–Landslide Relationship: Bahce–Nurdag
Tunnel (South of Turkey). Geotech Geol Eng, 38,
1237–1254.
- Hammah, R.E., Yacoub, T.E., and Corkum, B.C.,
2005. The Shear Strength Reduction Method for the
Generalized Hoek-Brown Criterion. ARMA/USRMS,
American Rock Mechanics Association, 05-810.
- Li, T., 2012. Damage to Mountain Tunnels Related to
the Wenchuan Earthquake and Some Suggestions for
Aseismic Tunnel Construction. Bull Eng Geol Environ,
71, 297–308.
- Moussaei, N., Sharifzadeh, M., Sahriar, K., Khosravi,
M.H., 2019. A New Classification of Failure Mechanisms
at Tunnels in Stratified Rock Masses Through Physical
and Numerical Modelling. Tunnelling and Underground
Space Technology, 91, 103017.
- Rabcewicz, L.v., 1964a. The New Austrian Tunnelling
Method, Part One. Water Power, pp. 453–457.
Rabcewicz, L.v.,1964b. The New Austrian Tunnelling
Method, Part Two. Water Power, pp. 511–515.
- Rabcewicz, L.v., 1965. The New Austrian Tunnelling
Method, Part Three. Water Power, pp. 19–24.
- Rao, K., Singh, T., 2017. Two-Dimensional Finite
Element Based Parametric Analysis of South Portal
Slope, Rohtang Tunnel, India. Procedia Engineering,
173, 1330 – 1333.
- RocScience, 2020. Phase2 8.0 Excavation & Support
Design. https://rocscience.com/documents/pdfs/up
loads/8706.pdf.
- Roy, N., Sarkar, R., 2017. A Review of Seismic
Damage of Mountain Tunnels and Probable Failure
Mechanisms. Geotech Geol Eng, 35, 1–28.
- Sönmez, H., Ulusay, R., Gokceoglu, C., 1998. A
Practical Procedure for the Back Analysis of Slope
Failures in Closely Jointed Rock Masses. International
Journal of Rock Mechanics & Mining Sciences, 35 (2),
219 – 233.
- Taromi M., Eftekhari A., Hamidi J. K., Eghbali A., 2018.
Tunnel Designing and Construction Process in Difficult
Ground Conditions Using Controlled Deformations
(ADECO) Approach: A Case Study. International
Journal of Mining and Geo-Engineering, IJMGE 52-2,
149–160.
- Tuncay, E., 2018. Assessments on Slope Instabilities
Triggered by Engineering Excavations Near a Small
Settlement (Turkey). Journal of Mountain Sciences, 15
(1), 114-129.
- Yang, X.L., Huang, F., 2011. Collapse Mechanism of
Shallow Tunnel Based on Nonlinear Hoek–Brown
Failure Criterion. Tunnelling and Underground Space
Technology, 26, 686 – 691.
- Zhang, Z., Li, H., Yang, H., Wang, B., 2019. Failure
Modes and Face Instability of Shallow Tunnels Under
Soft Grounds. International Journal of Damage
Mechanics, 28 (4), 566–589.
- Zou, J., Chen, G., Qian, Z., 2019. Tunnel Face Stability
in Cohesion-Frictional Soils Considering the Soil
Arching Effect by Improved Failure Models. Computers
and Geotechnics, 106, 1-17.