Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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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.Master Thesis Numerical Modeling of Jet Grouting Cells To Reduce Liquefaction(Izmir Institute of Technology, 2019) Gürbüz, Çağdaş; Ecemiş Zeren, NurhanThe importance of the preservation of historical and culturally important buildings is essential nowadays. While improving the performance of the buildings under dynamic loadings, it is essential to evaluate and improve the subsoil conditions. It is evident, that strengthening of the building will not provide the desired performance, if serious ground problems such as liquefaction are not eliminated during earthquake loading. In this study, liquefaction evaluation of the foundation soil of a historical building (Vali Konagi), which is in the Konak district of İzmir province, has been carried out. The simplified liquefaction assessment results based on the standard penetration tests showed that under 0.45g loading, the liquefaction problem could be observed. Therefore, soil improvement is necessary for the upper profile beneath this historical building. The jet grout cells, which is a new method were suggested as a soil improvement technique against the liquefaction of the soil below the building. The parameters related to the jet grout cells were determined, and the improved soil status was analyzed. The numerical analyses of the liquefaction investigation at unimproved and improved soil were compared by finite difference program FLAC-2D. The constitutive model (UBCSand), which can simulate liquefaction was used in the program. As a result, it is observed that; by using jet grout cells liquefaction was not triggered and deformations were kept under control.