Comparıson Of The Instrumentatıon Results Obtaıned From Supported Deep Excavatıon Case Hıstorıes Wıth Fınıte Element Analyses

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Thesis Type: Postgraduate

Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, -, Turkey

Approval Date: 2017

Thesis Language: Turkish

Student: CANER RUHİ CAVLAZ

Supervisor: SAMİ OĞUZHAN AKBAŞ

Open Archive Collection: AVESIS Open Access Collection

Abstract:

Nowadays, with the possibilities presented by advanced machine-equipment technology, many structures are being designed with multiple basement floors. The vast majority of deep foundation excavations in Turkey are supported by excavation support systems formed by bored piles and prestressed anchorages. In recent years, the finite element method has been replaced the conventional methods used in excavation support system design. Different approaches are used about assumptions on excavation support system design and material models used in finite element analyses. Correspondingly, very different projects are produced for excavations of same depth in similar soil characteristics. In addition, displacements that can not be foreseen in many deep excavations may lead to serious physical damage. Within the scope of this study, the inclinometric displacement data obtained from deep excavations completed in Ankara are compared with case analyses to be able to make suggestions concerning the material models and parameters to be used in excavation support design and analysis. As a result of the studies done, the correlation between the undrained deformation modulus and undrained shear strength of Ankara clay was revealed as a function of excavation induced displacements and suggestions were made concerning the anchor bonds' location for safe and economical design. Also, the penetration depth required to maintain a safe excavation support system by limiting lateral displacements of the pile tip was examined.