A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Tunneling problems in weak rock conditions under shallow overburden and comparison between full-face excavation and sequence excavation methods
The T8 tunnel was constructed within the scope of the Ankara – Sivas High-Speed Railway project. The tunnel route is formed completely by very weak and weak lithological units. The overburden decreases to 10 m, and the highest overburden thickness reaches up to 60 m. The tunnel is large with a 150 m2 excavation area and 14 m diameter. During the excavations in the section with an overburden thickness of 12 m, the supports failed, and the tunnel was completely collapsed. The purposes of the present study are to discuss the causes of the failure and engineering measures and to compare NATM and ADECO-RS methods with three-dimensional (3D) numerical analyses. Considering the mechanism of failure, extra engineering measures were proposed and the T8 tunnel was completed successfully. For the purpose of the study, a series of 3D numerical analyses were performed, and the results are discussed. The results obtained from the 3D numerical analyses showed that the ADECO-RS method yielded higher performance than the NATM method, for very weak and weak ground conditions (Category C).
Tunneling problems in weak rock conditions under shallow overburden and comparison between full-face excavation and sequence excavation methods
The T8 tunnel was constructed within the scope of the Ankara – Sivas High-Speed Railway project. The tunnel route is formed completely by very weak and weak lithological units. The overburden decreases to 10 m, and the highest overburden thickness reaches up to 60 m. The tunnel is large with a 150 m2 excavation area and 14 m diameter. During the excavations in the section with an overburden thickness of 12 m, the supports failed, and the tunnel was completely collapsed. The purposes of the present study are to discuss the causes of the failure and engineering measures and to compare NATM and ADECO-RS methods with three-dimensional (3D) numerical analyses. Considering the mechanism of failure, extra engineering measures were proposed and the T8 tunnel was completed successfully. For the purpose of the study, a series of 3D numerical analyses were performed, and the results are discussed. The results obtained from the 3D numerical analyses showed that the ADECO-RS method yielded higher performance than the NATM method, for very weak and weak ground conditions (Category C).
Tunneling problems in weak rock conditions under shallow overburden and comparison between full-face excavation and sequence excavation methods
Aygar, Ebu Bekir (author) / Karahan, Servet (author) / Gokceoglu, Candan (author)
Geomechanics and Geoengineering ; 19 ; 668-688
2024-07-03
21 pages
Article (Journal)
Electronic Resource
English
Swedish rock excavation projects use full-face boring
Elsevier | 1987
Displacements estimate due twin tunnel excavation under low overburden
| British Library Conference Proceedings | 2007
Estimation of Excavation Damaged Zone of Long-Span and Shallow Overburden Tunnel
| British Library Conference Proceedings | 2006
Rock Melting Applied to Excavation and Tunneling
| NTIS | 1974
Full face excavation in difficult ground
| Wiley | 2014