Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Experimental Study of Sheet Pile Retaining Walls With Granulated Rubber Reinforced Backfill(01. Izmir Institute of Technology, 2021) Khlaif, Ali Hamid Khlaif; Ecemiş Zeren, NurhanEarth retaining structures such as retaining walls, bridge abutment, bulkhead, braced excavation, and mechanically stabilized walls play a critical role in many infrastructural projects and are often subjected to different loading conditions. Performance of retaining walls under static and dynamic loading conditions depends upon the type of backfill soil. According to the European tire and rubber manufacturers’ Association (ETRMA) report about the end-of-life tyers management in 2017, Turkey recovers 0% of scrap tires in the civil engineering, public works, and backfilling category. This study aims at describing the ability to use granulated rubber sand mix as a backfill material in earth retaining structures. Therefore, physical model tests were conducted to investigate the deformation characteristics and pressure distribution of granulated rubber-sand mixture backfill behind the sheet pile. At dry and saturated conditions, granulated rubber-sand mixture backfill areas were changed in the physical model tests. Granulated rubber showed promising results that reduced the stiffness and density and increased the shear strength when used with sand. 6%, 8%, 10%, 12, and 15% granulated rubber mixing ratios have been tested using coarse and fine granulated rubber. The optimum ratio was 10% of finely granulated rubber. The maximum dry density reduced by 3.1%, and the maximum shear strength increased by 6.1%. When the granulated rubber-sand mix was used as a backfill, it reduced the lateral earth pressure and increased the water seepage under the sheet pile. The sheet pile model with granulated rubber sand mix backfill showed higher strength than the clean sand model.Master Thesis Investigation on the Liquefaction Potential of Sand-Granulated Rubber Mixture That Used Around the Buried Pipes: Numerical Modeling and Developing(01. Izmir Institute of Technology, 2021) Valizadeh, Hadi; Ecemiş Zeren, NurhanRecently, the sand-granulated rubber mixture has been reported as a new soil improvement method that can be applied as a liquefaction mitigation filling material around the buried pipes. This study performed numerical modeling of liquefaction potential of tire-derived granulated rubber–sand mixture used around the buried pipes by the FLAC 2D software. The effects of pipe size, burial depth, and shaking intensity on the pipe uplift and the liquefaction potential of the sand-tire derived granulated rubber mixture placed around the buried pipes were investigated using the finite difference method. Furthermore, UBCSAND advanced soil constitutive model was used for liquefaction analysis. First, the result of 1-g shaking table tests was utilized for the verification of the numerical analysis. Comparing the numerical results and the experimental measurements showed that the numerical simulation using the UBCSAND constitutive model could accurately estimate the liquefaction-induced uplift of the buried pipes as well as the related failure. Then, a parametric study was conducted to investigate the effects of the pipe diameter, pipe depth, and the maximum acceleration on pipe uplift and liquefaction potential when the sand-granulated rubber mixture was placed as the filling material. Eventually, an analytical formula was proposed to estimate the liquefaction-induced uplift of buried pipes, and the soil failure mode was categorized according to the pipe's burial depth.