Thesis Type: Doctorate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, -, Turkey
Approval Date: 2020
Thesis Language: Turkish
Student: ADEM IŞIK
Supervisor: AYHAN GÜRBÜZ
Open Archive Collection: AVESIS Open Access Collection
Abstract:In the scope of this study, laboratory pullout tests were used to examine the friction behavior between geocell and the soil, and friction behavior was determined both theoretically and analytically using the experimental results obtained. Moreover, the soil-geocell friction behavior and foundation loading tests were performed on model wall tests and wall behaviors were investigated. A total of 55 laboratory pullout tests were carried out under different normal stresses, on geocell of varying sizes and stiffness. The pullout capacities of the geocell embedded in the soil were determined theoretically according to the experimental results and it was observed that there was a good agreement between the obtained theoretical approach and the experimental results. In order to model the friction behavior of the geocell in the soil, bond stress-displacements graphs have been generalized in order to create a new friction behavior model by transforming the load displacement behaviors. A general relationship between the maximum bond stress values obtained using the strain values measured in the experimental study and the dimensions of geocell reinforcements and the normal stress has been revealed. In addition, after the bond stress-displacement curves have been generalized, the displacement and ultimate displacement values at the maximum bond stress, which are important values in these curves, have also been determined depending on the dimensions of the geocell and normal stress. Generalized equations that reveal from the bond stress-displacement relationships are used in retaining wall designs. Moreover, model wall experiments were carried out in the laboratory in order to determine the performance of geocell whose pullout capacities and friction behavior were determined as reinforcement elements on a retaining wall. The performance of the geocell was compared using geostrip and geostrip-geocell on the model wall.