Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

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Publisher: search.filters.publisher.Izmir Institute of TechnologySubject: search.filters.subject.Soil stabilization

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  • Master Thesis
    Performance of Sand Granulated Rubber Mixture for Soil Stabilization Using Discrete Element Method (dem)
    (Izmir Institute of Technology, 2022) Kadekeshova, Kuralay; Ecemiş Zeren, Nurhan; 01. Izmir Institute of Technology
    The results of a detailed analysis of the capability of numerical approach Discrete Element Method (DEM) to replicate a physical model of a sheet pile foundation in dry soil under static loads are presented in this study. Accordingly, the DEM software Particle Flow Code 2-Dimensional (ITASCA, 2019) is used to model experimental tests. Numerical model of direct shear test on clean sand and sand mixed with 10% granulated rubber has been done to calibrate the micromechanical parameters of the granular materials, such as sand and rubber particles. The particle sizes, density, interparticle friction coefficient, and contact stiffness of the discrete elements were determined and used in DEM simulations of sheet pile foundation. A total of four DEM models of the sheet pile foundation with different sand-rubber mixture backfill area were tested and analyzed in PFC2D. The loading process speed, contact stiffnesses, and porosity of the system had a significant impact on the deformation parameters of the sheet pile and lateral pressure distribution of the sand-rubber mix backfill. In this study two measurement methods were investigated. First, the measuring particles of the sheet pile particles were used, whereas the second, the measuring circles were placed behind the sheet pile foundation. The measurement circles proposed by (ITASCA, 2019) were suitable for the DEM model. Numerical outcomes showed a relative good match with the physical model. Finally, the ability of the PFC2D code as a discrete element approach in modelling of cohesionless granular material and sheet pile foundation is confirmed in this work.
  • Master Thesis
    An Experimental and Analytical Study of Various Soil Slopes in Laboratory Conditions
    (Izmir Institute of Technology, 2009) Pulat, Hasan Fırat; Egeli, İsfendiyar; Egeli, İsfendiyar; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Slope stability is a significant subject of geotechnical engineering. Slope failures triggered by rainfall are causing considerable damage and loss of life every year throughout the world. Especially at dry seasons when the rainfall is scarce, the ground can develop considerable amount of suction and this improves the shear strength of the soil. In rainy season, when rainfall infiltrates into ground, suction decreases, while the shear strength also reduces, which may lead to slope instability. One of the principle objectives of this study is to represent the development of soil-water interaction modeling system (SWIMS) at IYTE. Using this system; effects of 3 different parameters, such as: initial water content, soil density, slope angle on modelling unsaturated slope stability were studied. Moreover, effects of infiltration on slope stability in shallow landslides, where it is assumed that the ground water tables are located at significant depths, were examined.In this thesis study, 12 main slope model experiments were completed in laboratory conditions, using Soil-Water Interaction Modelling System (SWIMS) by varying 3 different parameters. Result of studies shows that slope angle is the most important parameter affecting slope stability. Furthermore, parameters such as; soil density, degree of relative compaction of soil and initial water content affects slope stability, while these parameters also affect slope surface erosion and infiltration depths. In addition to experimental studies conducted in laboratory conditions with the 12 main slope model experiments, slope stability analyses to find FOS were performed by using Plaxis V9 (2D) finite element program (FEM), which uses shear strength reduction (SSR) technique and infiltration analyses using the Plaxflow module to model the rainwater infiltration into slope soil were performed. The FEM analyses show conforming results with the actual observations made using the tested soil model in laboratory conditions.