Abstract
For over 50 years, the Upper Oligocene–Upper Miocene sedimentary sequence in Istanbul has been considered to be formed of two distinct sequences separated by an unconformity. However, recent field observations and an analysis of numerous borehole data indicate the Gürpınar, Çukurçeşme and Güngören Formations are in fact a single sequence of alternating clay–sand/sandstone beds/lenses, here named the Avcılar Formation. The Bakırköy Formation, which is typically composed of carbonate rocks, conformably overlies the Avcılar Formation. The paper provides the geotechnical parameters of the units within the Avcılar Formation which it is hoped will facilitate selecting suitable geotechnical and engineering geological parameters to represent the deposits and minimize errors in the interpretation/evaluation of in-situ conditions.
Résumé
Depuis plus de 50 ans, la série sédimentaire de l’Oligocène supérieur - Miocène supérieur d’Istanbul a été considérée comme constituée de deux séquences distinctes séparées par une surface de discordance. Cependant, des observations récentes sur le terrain et une analyse de nombreuses données de forage indiquent que les formations de Gürpinar, Cukurcesme et Güngören constituent en fait une seule séquence présentant des alternances de lits ou lentilles de sables argileux ou de grès, ici nommée formation d’Avcilar. La formation de Bakirköy, qui est généralement composée de roches carbonatées, recouvre en continuité la formation d’Avcilar. L’article présente les paramètres géotechniques des différentes unités constituant la formation d’Avcilar. On espère faciliter ainsi la sélection des paramètres géotechniques aptes à représenter les différentes unités géologiques, tout en minimisant les erreurs dans l’analyse des paramètres in situ des unités.
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Yıldırım, M., Tonaroğlu, M., Selçuk, M.E. et al. Revised stratigraphy of the Tertiary deposits of Istanbul and their engineering properties. Bull Eng Geol Environ 72, 413–420 (2013). https://doi.org/10.1007/s10064-013-0485-4
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DOI: https://doi.org/10.1007/s10064-013-0485-4