Journals / Konya Journal of Engineering Sciences / 2021 / Cilt: 9 Sayı: 4

Numerical Modelling of Entrance and Exit Portals in Pirinkayalar Tunnel (Erzurum, Turkey): A Case Study

PİRİNKAYALAR TÜNELİ (ERZURUM, TÜRKİYE) GİRİŞ VE ÇIKIŞ PORTALLARININ SAYISAL MODELLENMESİ: ÖRNEK VAKA ÇALIŞMASI

Pages
1025–1039
Publication Date
2021-12-04
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

With this case study, numerical modeling results, which are used as an auxiliary tool to obtain information about the state of the empirically designed support system in a tunnel, are mentioned.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Rock mass classification systems are used to characterize the mechanical behavior of the rock mass, as well as suggestions for the support design to be used in tunnel excavation.
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Key Findings & Data:In this study, the entrance and exit portals of the Pirinkayalar tunnel are modeled in 3D using the FLAC3D based on the finite difference method.
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Conclusion & Impact:With this case study, numerical modeling results, which are used as an auxiliary tool to obtain information about the state of the empirically designed support system in a tunnel, are mentioned.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Kaya kütlesi sınıflama sistemleri · Kazı · Sayısal modelleme

Abstract

Rock mass classification systems are used to characterize the mechanical behavior of the rock mass, as well as suggestions for the support design to be used in tunnel excavation. In many tunnel projects from past to present, the support has been designed with the suggestions in the rock mass classification systems. Continuous monitoring of tunnel deformations and determination of support condition can be difficult and costly for practitioners. Pirinkayalar tunnel is one of the tunnels on the Artvin-Erzurum highway that connects Eastern Black Sea to Eastern Anatolia and the support system proposed with NATM (New Austrian Tunneling Method) was used. The support system planned at the project stage was changed again depending on the rock mass classification system during the excavation. Analysis of the excavation and preferred support system in the entrance and exit portals of tunnels prevent possible problems. In this study, the entrance and exit portals of the Pirinkayalar tunnel are modeled in 3D using the FLAC3D based on the finite difference method. With this case study, numerical modeling results, which are used as an auxiliary tool to obtain information about the state of the empirically designed support system in a tunnel, are mentioned.

Özet

Kaya kütlesi sınıflama sistemleri kaya kütlesinin mekanik davranışını karakterize etmek için kullanılmasının yanı sıra tünel kazısında kullanılacak tahkimat tasarımı için de öneriler sunmaktadır. Geçmişten günümüze birçok tünel projesinde kaya kütlesi sınıflama sistemlerindeki önerilerle tahkimat tasarımı yapılmıştır. Tünel deformasyonlarının sürekli olarak izlenmesi ve tahkimat durumunun tespiti, uygulayıcılar için zor ve maliyetli olabilmektedir. Pirinkayalar tüneli Doğu Karadeniz’i Doğu Anadolu’ya bağlayan Artvin-Erzurum karayolu üzerindeki tünellerden biri olup tahkimat tasarımında NATM (Yeni Avusturya Tünel Açma Yöntemi) ile önerilmiş tahkimat sistemi kullanılmıştır. Proje aşamasında planlanan tahkimat sistemi kazı sırasında bazı bölgelerde yine kaya kütlesi sınıflama sistemine bağlı olarak değiştirilmiştir. Tünellerde giriş ve çıkış portallarının kazısı ve tercih edilen tahkimat sisteminin analizi muhtemel sorunların önlenmesini sağlayacaktır. Bu çalışmada, Pirinkayalar tünelinin giriş ve çıkış portalları sonlu farklar yöntemine dayalı olarak analiz gerçekleştiren FLAC3D programı kullanılarak 3 boyutlu olarak modellenmiştir. Gerçekleştirilen bu örnek vaka çalışması ile, bir tünelde ampirik yöntemle tasarlanan tahkimat sisteminin durumu hakkında bilgi edinmek için yardımcı araç olarak kullanılan sayısal modelleme sonuçlarına değinilmiştir.

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Cite This Article

SAKCALI, A. (2021). Numerical Modelling of Entrance and Exit Portals in Pirinkayalar Tunnel (Erzurum, Turkey): A Case Study. Konya Journal of Engineering Sciences, Cilt: 9 Sayı: 4, 1025–1039. https://ajindex.com/articles/909057

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References (11)

  1. Agan, C., 2016, “Prediction of squeezing potential of rock masses around the Suruc water tunnel”, Bull Eng Geol Environ, 75 (2), pp. 451-468.
  2. Akgun, H., Muratli, S., Kockar, M. K., 2014, “Geotechnical investigations and preliminary support design for the Gecilmez tunnel: a case study along the Black Sea coastal highway, Giresun, northern Turkey”, Tunn Undergr Space Technol, 40, pp. 277-299.
  3. Barton, N., Lien, R., Lunde, J., 1974, “Engineering classification of rock masses for the design of tunnel support”, Rock Mech, 6 (4), pp. 189-239.
  4. Basarir, H., 2006, “Engineering geological studies and tunnel support design at Sulakyurt dam site, Turkey”, Eng Geol, 86, pp. 225-237.
  5. Basarir, H., Genis, M., Ozarslan, A., 2010, “The analysis of radial displacements occurring near the face of a circular opening in weak rock mass”, Int J Rock Mech Min Sci, 47 (5), pp. 771-783.
  6. Bi, J., Zhou, X. P., 2015, “Numerical simulation of zonal disintegration of the surrounding rock masses around a deep circular tunnel under dynamic unloading”, Int J Computational Methods, 12 (3), 1550020, pp. 1-23.
  7. Bieniawski, Z. T., 1978, “Determining rock mass deformability: experience from case histories”, Int J Rock Mech Min Sci Geomech Abstr, 15, pp. 237-247.
  8. Bieniawski, Z. T., 1989, Engineering rock mass classifications, Wiley, 251. Brown, E.T., Hoek, E., 1978, “Trends in relationships between measured and in situ stresses and depth”, Int J Rock Mech Min Sci Geomech Abstr, 15 (4), pp. 211-215.
  9. Carranza-Torres, C., Fairhurst, C., 2000, “Application of the convergence confinement method of tunnel design to rock masses that satisfy the Hoek–Brown failure criterion”, Tunn Undergr Space Technol, 15 (2), pp. 187-213.
  10. Corbetta, F., Bernaud, D., Nguyen-Minh, D., 1991, “Contribution a la methode convergerce confinement par le principe de la similitude”, Rev Fr Geotech, 54, pp. 5-11 (in French). Deney Raporları, 2019, Pirinkayalar tünel ve bağlantı inşaatı projesi deney roporları. Genis, M., Basarir, H., Ozarslan, A., Bilir, E., Balaban, E., 2007, “Engineering geological appraisal of the rock masses and preliminary support design, Dorukhan Tunnel, Zonguldak, Turkey”, Eng Geol, 92, pp. 14-26.
  11. Grimstad, E., Barton, N., 1993, “Updating the Q-system for NMT”, Proc Int Symp on Sprayed Concrete, Fagernes, Norway, Norwegian Concrete Association, Oslo, 20. Gurocak, Z., 2011, “Analyses of stability and support design for a diversion tunnel at the Kapikaya dam site, Turkey”, Bull Eng Geol Environ, 70, pp. 41-52. G