NDLI: Comparison of geological conditions predicted from tunnel boreholes and found in situ

Content Provider	Springer Nature Link
Author	Dalgıç, S.
Copyright Year	2000
Abstract	The information available on five tunnels was assessed prior to construction and geological long sections prepared. These were compared to sections prepared as the excavations were undertaken. The tunnels involved were the Bolu tunnel, the Zincirlikuyu tunnel in the Istanbul Metro, the Moda wastewater tunnel, the Beykoz highway tunnel and the derivation tunnel of the Yayladağı dam in Turkey. The paper briefly discusses the variable geology encountered. In an area where extensive faulting has taken place, the subvertical faults were frequently not predicted from the boreholes. The work has shown the importance of undertaking a full investigation, possibly involving oblique boreholes and/or the use of geophysical and other downhole photographic methods to ensure the most accurate sections can be produced. The paper notes that in the case of these five tunnels, the investigation costs varied between 1 and 2% of the total cost of the projects. Les informations disponibles concernant cinq tunnels ont permis la réalisations de coupes géologiques prévisionnelles. Celles-ci ont été comparées aux coupes établies en suivant l'excavation de ces tunnels: les tunnels de Bolu, de Zincirlikuyu du métro d'Istanbul, de Moda, le tunnel autoroutier de Beykoz et le tunnel de dérivation du barrage de Yayladagi en Turquie. L'article présente sommairement les conditions géologiques rencontrées. Dans les régions intensément fracturées, les failles subverticales ont été rarement identifiées en sondage. Il est en fait très important de réaliser une reconnaissance géologique détaillée, avec si nécessaire des sondages obliques, des diagraphies géophysiques et des photographies en sondage permettant d'établir de bonnes coupes prévisionnelles. L'article souligne que pour ces cinq tunnels les coûts de reconnaissance ont représenté de 1 à 2% du coût des ouvrages.
Starting Page	115
Ending Page	123
Page Count	9
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	58
Issue Number	2
e-ISSN	14359537
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-02-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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