Design and Execution of Turdas Tunnel

Flaviu Ioan Nică 1  and Teodor Iftimie 2
  • 1 Technical University of Civil Engineering Bucharest,
  • 2 Technical University of Civil Engineering Bucharest,

Abstract

The paper presents aspects of the design and execution of the Turdas tunnel located on the local variant (route), on the Coşlariu - Simeria section, from the rehabilitation project of Brasov – Simeria railway line, component part of Pan European Railway Corridor IV, for train circulation with maximum speed of 160km/h. The tunnel crosses through alluvial deposits with silt and clay with locally sand layers at the upper part, sand and gravel with water in the middle part and marly silty clay and neogenic marl, with swelling phenomena, at the lower part. The overburden is between 2.00m and 13.00m. The initial project provided execution in underground, on 510.00m in the central area and from surface at both ends, 225.00m at the entrance and 45.00m at the exit. The new optimized project, based on new geological and geotechnical studies, proposed an execution from surface for the entire length of the tunnel. To establish the optimal solution two methods of surface execution and structural solutions were analyzed comparatively: “Cut and Cover” and “Cover and Cut”. The adopted method was “Cut and Cover”, with a structural solution composed of a temporary retaining structure – diaphragm walls with a special internal lining. This has been divided in six sections with different behavioral types, taking into account the ground configuration in longitudinal profile and the geological and geotechnical data. The technological execution phases are presented in detail. To investigate the behavior of this type of structure under soil and swelling actions, three-dimensional finite element analyses were carried out, taking into account the execution phases for each cross section. A monitoring system was provided to verify the stresses in the temporary retaining structure and the internal lining and also to calibrate future calculations.

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  • [1]. F. I. NICĂ: “PhD Thesis – Study of surface executed tunnels”, Doctoral School – Faculty of Railways, Roads and Bridges, Technical University of Civil Engineering Bucharest, 189p, April 2019.

  • [2]. http://www.hotnews.ro/stiri-esential-17043434-licitatii-aproape-2-miliarde-europentru-modernizarea-cailor-ferate-anulate-din-cauza-unei-omisiunidocumentatie.htm, 10.10.2015.

  • [3]. S.C. ISPCF S.R.L, “Rehabilitation of the railway line Brasov – Simeria, component part of the IV Pan- European Corridor for the trains circulation with maximum speed of 160km/h, Section Coslariu – Simeria, Lot 1: Vintu de Jos – Simeria, object Turdas Tunnel”, Romania, 2015.

  • [4]. T. IFTIMIE, ”Technical expertise – Turdas tunnel project”, March 2015.

  • [5]. L. BATALI, H. POPA, Luc THOREL, “Retaining walls in urban areas. Numerical modeling, characteristic interaction parameters”, Scientific Journal - Mathematical modeling in civil engineering, vol. 8, no.1, Technical University of Civil Engineering Bucharest, march 2010.

  • [6]. H. POPA, L. BATALI, “Using finite element method in geotechnical design. Soil Constitutive laws and calibration of parameters. Retaining wall case study”, WSEAS Transactions on Applied and Theoretical Mechanics, ISSN: 1991-8747, Issue 3, Volume 5, July 2010.

  • [7]. H. SCHWEIGER, “Modelling issues for numerical analysis of deep excavations”, Computational Geotechnics Group, Institute for Soil Mechanics und Foundation Engineering, Graz University of Technology, Austria.

  • [8]. H. POPA, L. BATALI, S. MANEA, “Calculul structurilor de sustinere a unor excavatii adanci”, Revista constructiilor, nr. 91, Romania, 2013.

  • [9]. F. I. NICA, T. IFTIMIE, “Cut and Cover in swelling soil”, Proceedings of World Tunnel Congress – Surface challenges – Underground solutions, Bergen, Norway, pp. 1490-1496, 9 -15th June 2017.

  • [*] F. I. NICĂ, T. IFTIMIE: “Proiectarea şi executia Tunelului Turdas”, Al XV – lea Simpozion naţional de căi ferate, cu participare internaţională –,,Concepte noi în realizarea şi modernizarea liniilor de cale ferată”, organizată de Universitatea Tehnică de Construcţii Bucureşti, Facultatea de Căi Ferate, Drumuri şi Poduri, Editura Conspress, pp. 99-108, 27 Octomber 2016.

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