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Yayın On some of the factors influencing the engineering properties of improved clayey soils(Işık Üniversitesi, 2022-07-04) Göçkün, Beste Seyla; Etminan, Ehsan; Işık Üniversitesi, Lisansüstü Eğitim Enstitüsü, İnşaat Mühendisliği Yüksek Lisans ProgramıAlternative materials and techniques are constantly being investigated within the scope of innovative solutions for the construction of earth structures. Improvement of soft soils for the structures, such as subgrades of highway embankments and shallow foundation soils, can be critical for implementing sustainable and economic applications, especially in the cases where alternative materials are used in soft soils. During this thesis, the high plasticity clay was mixed with class C fly ash which is a recycled material, and two different synthetic fibers in order to stabilize clayey soil. Furthermore, fly ash combined with each copolymer and polypropylene fiber was added to the high plasticity clay to observe more effective improvement. In this thesis, findings from both laboratory and numerical analysis executed with particular emphasis on the use of mentioned alternative materials were represented. First, the compaction and unconfined compression tests were performed on all mixtures. On the other hand, the influence of adding alternative materials to high plasticity clayey soil was studied from analytical aspects by modifying and suggesting new versions of the Duncan-Chang hyperbolic model for the unconfined compression test results. After gathering the unconfined compression test results of mentioned mixtures, the initial tangent modulus (Ei) and the tangent modulus at half of the maximum stress (Et50) were found using the modified Duncan-Chang model. Then, the secant modulus at failure point (Esf) and the secant modulus at half of the maximum stress (Es50) were determined by suggested new equations in terms of the initial tangent modulus and the tangent modulus at half of the maximum stress. The relationship between each soil moduli and the unconfined compression strength of all tested samples were also presented. Finally, obtained soil moduli values of high plasticity clay mixtures improved that mentioned alternative materials and increased the strength and load-deformation properties of high plasticity clayey soil with different percentages.
