Applıcatıon Of Fınıte Element Method In Geotechnıcal Rısk Analysıs: An Applıcatıon For Supported Deep Excavatıons

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Thesis Type: Postgraduate

Institution Of The Thesis: Gazi University, Turkey

Approval Date: 2019

Thesis Language: Turkish

Student: Sinem Bozkurt

Supervisor: SAMİ OĞUZHAN AKBAŞ

Open Archive Collection: AVESIS Open Access Collection

Abstract:

Evaluation of the reliability of deep excavation support systems designed by the deterministic finite element method requires the inclusion of the effect of soil variability in conjunction with probabilistic analysis in the design phase. In this context, a 20 m deep excavation case history with anchor support in Söğütözü, Ankara designed with conventional deterministic methods and a deep excavation case history of a soil nailed wall designed for the temporary excavation of Istinye Park complex in Istanbul were investigated. In this study, in addition to effect of soil variability the soil strength parameters determined by back analysis via inclinometer readings were included in the analyzes. The probabilistic distributions of geotechnical parameters of the formation of over-consolidated Ankara Clay had been defined in the literature in detail. The soil parameters determined by Monte Carlo simulation method were used in the analyses performed by the finite element method. Experimental results indicate that sand-gravel bands which are common in Ankara Clay, cause a significant decrease in the anchorage capacity. Considering this effect, variability of soil parameters on wall structural capacity and wall lateral displacement is evaluated in this study. For this purpose, the finite element analysis is performed with Python scripting software and the reliability of the deep excavation designed with the conventional methods is examined by the Monte Carlo Simulation method.