Kurter, Ege Can
The initial filling is considered to be the first safety test of the embankment followed after construction. The earth material acts significantly different during the first interaction with water. The majority of the failures occur during initial filling. The reasons of failures are mainly attributable to crack formation and internal erosion followed by piping. The filling is commonly practiced in multi-stages where intermediary holds are provided for monitoring purposes before the embankment is further loaded. This study focuses on the behavior of the embankment during first filling and aims to propose certain hold durations as well as the components affecting the durations. The finite element model is applied on a 20 m high earthfill dam using GeoStudio software. Coupled stress and pore-water pressure analyses are carried on in which the transient behavior of filling process is clearly identified. Hydraulic fracturing phenomenon is considered as the driving mode for crack and internal erosion formation. Furthermore, the study findings investigate the effect of uncontrolled filling rate on the durations of the holds. It is found that the initiation of hydraulic fracturing is more influenced from the initial conditions of the soil rather than a planned filling schedule. The earth material placed in dry conditions caused crack formation at the higher elevations of upstream side of the core. Additionally, the study proposed certain hold duration for intermediary hold up to a low pool level and revealed the positive effect of waiting at higher pool levels against hydraulic fracturing.


Yamalı, Uluç; Shafee, Sina; Yozgatlıgil, Ahmet (2015-09-11)
Fire accidents in recent decades have drawn attention to safety issues associated with the design, construction and maintenance of tunnels. A reduced scale tunnel model constructed based on Froude scaling technique is used in the current work. Mixtures of n-heptane and ethanol are burned with ethanol volumetric fraction up to 30 percent and the longitudinal ventilation velocity varying from 0.5 to 2.5 m/s. The burning rates of the pool fires are measured using a precision load cell. The heat release rates o...
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Ergün, Hüseyin; Aydınol, Mehmet Kadri; Öztürk, Tayfur; Doruk, Mustafa (2013-07-25)
An apparatus was designed that enables the testing of boiler tubes against erosion. The apparatus makes use of a tube sample and simulates conditions similar to those prevailing in boilers in lignite-based power plants. The apparatus is composed of 3 components: a furnace for heating the sample, a loading system that allows the application of tensile stresses while allowing its rotation, and an erosion unit that delivers abrasive particles to the surface of the sample. The unit, as designed, would allow tes...
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Uysal, Mehmet Akış; Köken, Mete; Aydın, İsmail; Department of Civil Engineering (2014)
For design purposes it is important to predict the downpull forces on the tunnel gates installed in the intake of a hydropower plant. In this study downpull forces on the gates are evaluated for different closure rates and for different gate lip geometries using computational fluid dynamics and the results are compared to an existing experimental study. Commercial ANSYS FLUENT software is used in the calculations. It is found that downpull coefficients obtained from computational study showed good agreement...
An experimental study on the burning rates of interacting fires in tunnels
SHAFEE, SINA; Yozgatlıgil, Ahmet (2018-03-01)
Multiple fires may occur in close proximity in process industries, power generation and fuel storage facilities and confinement conditions such as tunnels, which can lead to a considerable alteration in fire characteristics and safety design. The topic is of significant importance to the fire safety research because there is little work in the literature that investigates the case of interacting fires, which have a destructive potential. In this work, we study the effects of an adjacent fire source on the b...
An Overview on Rigid Pavement Specifications in Developed Countries
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As any engineering structure, for the highway pavement design and construction a series of technical, economic and environmental factors is considered before the material selection. The technical factors involve physical, chemical, and mechanical features, the ease of construction work, construction duration, durability requirements and the safety and comfort of the selected materials under service and environmental conditions. On the other side, the initial cost and the life cycle cost are among the econom...
Citation Formats
E. C. Kurter, “A STUDY ON RESERVOIR FILLING PRACTICES FOR SMALL EARTHFILL DAMS,” M.S. - Master of Science, Middle East Technical University, 2022.