Comparison of deformations from 2d and 3d fem analysis with field measurements of a top down deep excavation in bağcilar metro station

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2015

Öğrenci: ABDULLAH ONUR USTAOĞLU

Danışman: ERDAL ÇOKÇA

Özet:

In this thesis, 2D and 3D FEM analysis results are compared with field measurements of a top down deep excavation in Bağcılar Metro Station which is on the Otogar - Bağcılar Light Rail Transit Line in İstanbul. First, a literature review on deep excavations is performed. The soil formation observed in the project site is Güngören formation and the dominant soil type is silty clay. After selecting the soil parameters and soil models, 2D and 3D models of the excavation are analyzed by FEM programs PLAXIS2D and PLAXIS3D. Deformation measurements taken by inclinometers are compared with the calculated deformations from FEM. The thesis study shows that lateral displacements of 2D analysis are between 3 and 4 times larger than the inclinometer measurements and 3D analysis. Moreover, 3D analysis results and inclinometer measurements are approximately same.