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Article Citation - WoS: 19Citation - Scopus: 19Interaction Between Assembled 3d Honeycomb Cells Produced From High Density Polyethylene and a Cohesionless Soil(Sage Publications Ltd, 2012) Gurbuz, Ayhan; Mertol, Halit CenanAssembled 3D high-density polyethylene honeycomb cells, providing confinement to arrest spreading of the soil in cells and creating relatively stiff bed that redistributes footing pressure over wider area, were used in the present study to enhance load-carrying capacity and to reduce settlement of base materials under a foundation. The effects of various test parameters including width, height, number of layers of the 3D honeycomb cells, vertical distance between layers of the cells and depth of stress zone of the foundation were studied. The test results indicated that considerable improvement in the load-carrying capacity (congruent to 3.0) and reduction in settlement of the foundation (congruent to 62%) were obtained with the implementation of the single layer of the 3D cells into cohesionless soils. The optimum effective distance between two layers of the 3D cells was 0.142 times the width of foundation, the ratio of effective width of 3D cells to the foundation was about 4.2 and the depth of influence stress zone of the foundation was about two times the width of the foundation.Article Citation - WoS: 10Citation - Scopus: 9Bacteria-Induced Cementation in Sandy Soils(Taylor & Francis inc, 2015) Gurbuz, Ayhan; Sari, Yasin Dursun; Yuksekdag, Zehra NurBacteria-induced calcite precipitation (BICP) is a promising technique that utilizes bacteria to form calcite precipitates throughout the soil matrix, leading to an increase in soil strength and stiffness. This research investigated BICP in two types of sands under sterile and nonsterile conditions. Bacteria formation and BICP in the sterilized sand specimens are higher than those in the nonsterilized sand specimens. The development of calcite with time is initially greater for the sand specimens containing calcite. Scanning electron microscope imaging allowed the detection of cementation from calcite precipitation on the surface and pores of the sand matrix. The effects of injecting nutrient mediums and bacteria into the specimens, as well as pH of soil samples on BICP were investigated. The bearing capacity of biologically treated vs. untreated sand specimens were determined especially by laboratory foundation loading tests.Article Citation - WoS: 1Citation - Scopus: 1Determination of Lateral Displacements of Laterally Loaded Steel Piles in Cohesionless Soils Using Elastic Curve Equation(Gazi Univ, Fac Engineering Architecture, 2011) Gurbuz, Ayhan; Department of Civil EngineeringLaterally loaded piles find wide application areas. Some of those application areas of laterally loaded piles are bridge foundations, ports and landslides. Accurate and simple calculation of lateral displacement of laterally loaded piles becomes vital for structure safety. Measured from the ground surface, the distance to the point on the pile where the deformation in the direction of the load (applied at the top of the pile) becomes zero is called the critical depth of pile. Laterally loaded pile faces with passive resistance in front of pile, active resistance at back side of pile and frictional resistance at sides of piles along pile critical length. In this study, pile properties, applied load and resistance forces pile faces are modeled in two-dimensional to determine lateral displacement of pile under lateral load using elasticity curve equations. The measured lateral displacements of three tested laterally loaded steel pipe piles are compared with both the analysis of equations proposed in this study and the analysis results of computer program LPile based on the p-y curves. It is found that the proposed equations to determine lateral displacement of laterally loaded steel piles in cohesionless soils yield to very close result of field measured lateral displacements.
