Ahmet Pamuk
Columbia University
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Featured researches published by Ahmet Pamuk.
Marine Georesources & Geotechnology | 2015
Ahmet Pamuk; Thomas F. Zimmie; Korhan Adalier; Mahadzer Mahmud
Increase in saturation in natural clayey slopes along coastal zones as a result of tsunamis or storm surges may cause flow slides or failures. One of the common treatments is to increase the overall stability by soil replacement and/or re-compaction, which is often difficult to implement, expensive, and, most importantly, damages the natural vegetation. In this paper, remedial effectiveness of a relatively economical and environmentally friendly method involving insertion of geotextile strips with drainage capability into natural clayey slopes is evaluated through a series of centrifuge tests. The test results demonstrate the effectiveness of the employed technique to increase the stability of slopes and their drainage capability as well as to reduce the deformations under surcharge loadings.
Advanced Materials Research | 2013
Korhan Adalier; Ahmet Pamuk
More than a billion rubber tires are discarded annually around the world. Growing piles of discarded tires create fire and environmental hazards. Current disposal methods are mostly wasteful and costly. Tires possess high tensile strength, are chemically very stable, practically non-destructible and light in weight. All of these properties make tires a potentially useful geo-material. This paper presents the results of an extensive laboratory testing study investigating the potential of using shredded tires mixed with sandy soils (rubber-sand) as lightweight fill and backfill material in road construction. The results show that rubber-sand has significant promise for use as an earthwork fill material. In addition to its engineering benefits, such use of scrap tires would significantly contribute to solving the ever-growing tire disposal problem.
Archive | 2007
Ahmet Pamuk; Korhan Adalier
This paper proposes two different remediation techniques, slightly different from conventional-type sheet-piled earth embankments, to reduce adverse effects induced by foundation liquefaction. A total of four centrifuge tests were conducted without and with countermeasure techniques, all involving model sheet-piles. The effectiveness of each countermeasure were compared and discussed based on the recorded displacements, accelerations, pore water pressure measurements and post-earthquake deformations. The tests showed that conventional sheet pile retrofitting method may not be fully adequate to reduce the distress in the embankment cased by liquefaction. However, the utilization of proposed countermeasures was found to be more significant in reducing the embankment settlement, deformation and cracking. Besides, they are practical and can be easily applied with less expense to existing structures.
Archive | 2007
Min-Hao Wu; Hoe I. Ling; Ahmet Pamuk; Dov Leshchinsky
Slope failures occurred frequently that resulted in the loss of lives and properties. Slope performed differently with respect to different slope angles, heights and soil properties. In this study, the centrifuge facility was used to simulate slope failure under two dimensional (2-D) conditions. Clean Nevada sand and its mixtures with different percentages of fines (up to 30% or so) were used. The slope angles were 60, 75 and 90 degrees. Slope failure was generated by increasing the gravity. A laser displacement transducer was used to measure the settlement at the top of the slopes that indicated initiation of failure. A video camera was used in front of the slope to trace failure and movement of failure soil mass. At the end of testing, the slope was cut to obtain the configurations of failure surface. The results showed a normalized behavior of slope failure surface. The normalized behavior tended to drift for less steep slope. Vertical slopes also showed shallower failure surface compared to 75- and 60-degree slopes.
Volume 3: Materials Technology; Ocean Engineering; Polar and Arctic Sciences and Technology; Workshops | 2003
Korhan Adalier; Ahmet Pamuk; Thomas F. Zimmie
Soil liquefaction and associated ground failures have caused much damage to coastal and waterfront structures in the past major earthquakes. The prevalence of liquefaction in the coastal environment necessitates the development of appropriate remediation countermeasures. This paper presents an experimental study involving centrifuge physical modeling to assess the earthquake performance of countermeasure retrofit techniques for a liquefiable marine foundation under an existing coastal dike-embankment. Currently, such testing results offer a valuable alternative to studying actual full-scale dynamic response, since such data is virtually non-existent for retrofitted dikes. The response of a cohesive dike supported on a loose saturated sand layer is analyzed under dynamic base excitation conditions. In a series of four separate heavily instrumented model tests, this embankment foundation system was studied first without, and then with, the following three foundation liquefaction countermeasure-retrofit techniques: crushed gravel (drain) walls, cemented soil walls, and sheet-pile enclosure. The underlying mechanism and effectiveness of each countermeasure is discussed, based on the recorded dynamic response. All of the implemented countermeasures were found to significantly reduce embankment deformations. In some cases, cracking and lateral spreading of the dikes were practically eliminated.Copyright
Soil Dynamics and Earthquake Engineering | 2005
Ahmet Pamuk; Erol Kalkan; Hoe I. Ling
Journal of Materials in Civil Engineering | 2007
Patricia M. Gallagher; Ahmet Pamuk; Tarek Abdoun
Soil Dynamics and Earthquake Engineering | 2007
Ahmet Pamuk; Patricia M. Gallagher; Thomas F. Zimmie
Archive | 2004
Ahmet Pamuk; Hoe I. Ling; Dov Leshchinsky; Erol Kalkan; Korhan Adalier
Geotechnical and Geological Engineering | 2005
Thomas F. Zimmie; Ahmet Pamuk; Korhan Adalier; Mahadzer Mahmud