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Deformation and failure of the Tymfristos tunnel, Greece
- Source :
- Journal of Geotechnical and Geoenvironmental Engineering. Oct, 2004, Vol. 130 Issue 10, p1004, 10 p.
- Publication Year :
- 2004
-
Abstract
- The Tymfristos tunnel, a 1,365 m long road tunnel with an 11 m section diameter, was excavated through the highly tectonized, low strength Flysch formation of central Greece. About 1 year after the completion of the excavation in 1995, convergence of up to 20% followed by failure of the support system was recorded. A 501 m long segment, in which the failure occurred, was reexcavated based on a more detailed study of the ground conditions; however, this second phase was also followed by an up to 6% convergence. The detailed geodetic study of the three-dimensional kinematics of the support shell in relation time, ring closure delays, and support measures reveals an unusual time-history of convergence occasionally continuing even after the ring closure and a nonuniform distortion of the lining. Furthermore, uncontrolled deformation of certain 'weak' sections propagated bidirectionally to adjacent, previously stabilized sections producing a 'chain effect,' responsible for destabilization and resumed convergence of long (~ 90 m) segments. CE Database subject headings: Convergence: Deformation analysis; Tunnels: Failures: Greece.
Details
- Language :
- English
- ISSN :
- 10900241
- Volume :
- 130
- Issue :
- 10
- Database :
- Gale General OneFile
- Journal :
- Journal of Geotechnical and Geoenvironmental Engineering
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.124488398