Papers by Omar Hamdi Jasim
Applied Sciences
The stability of the embankment’s slopes is a critical aspect of geotechnical engineering and it ... more The stability of the embankment’s slopes is a critical aspect of geotechnical engineering and it is essential to guarantee the effectiveness of the factor of safety to prevent any potential failures in the slope both during and post-construction. The current study consists of two parts; the first part is the study of the behavior of the geogrid-encased granular columns and their interaction with the soil at the shear surface generated by the slippage of the soil, while the second part is a study of the stability of slopes by changing several factors, including the area replacement ratio (Ar %) of the granular columns, the angle of the embankment slope (β), and different elastic modulus (Eg) of geogrid on the stability of an embankment. About 90 analyses were conducted on a clayey sand embankment over a clayey layer. The area replacement ratios (Ar %) were changed by using different values of the diameter of the column; from 50 to 100 cm. The angle of the embankment slope was changed...
Sixth International Conference on Developments in eSystems Engineering, 2013
One of sustainable concrete engineering criteria deals with founded new alternative materials can... more One of sustainable concrete engineering criteria deals with founded new alternative materials can be used in concrete mixes or structures. The objective of this study is to develop normal strength concrete using local crushed Al-Ma'mora stones and to evaluate the effect of a new coarse aggregate on mechanical and physical properties of produced concrete, also compared with normal (conventional coarse aggregate) concrete mix. In general, a new concrete mix shows higher than strength of normal concrete due to low porosity, particularly, when crushed coarse aggregate is used. However, the compressive strengths of new concrete mix using Al-Ma'mora and conventional (reference) aggregates are improved by 20%, due to texture modification. Also, the flexural strength of this concrete was higher than the reference concrete by 51.7%, and the splitting strength Almaamora stone concrete was higher than the reference concrete by 42.4% .
Sigma Journal Engineering and Natural Sciences, 2016
The aim of this paper is to study the effect of sawdust content on the engineering properties of ... more The aim of this paper is to study the effect of sawdust content on the engineering properties of clayey-silt soil. Soil from the district of Büyükçekmece in Istanbul city have been used. Its engineering properties were indicated. The dry soil passing sieves No.40 were mixed with the sawdust, with the amount 1, 2, 3 and 5 % from dry weight of soil, then, samples engineering properties were indicated. The study concluded that the addition of sawdust up to 5% decreased the liquid limits and the plasticity index by 14.9% and 17.6% respectively, and also decreased the plastic limits by 13.15%. Effect of sawdust usage on undrained shear strength of the soil were investigated by unconfined compression test and UU triaxial test. The undrained strength were increased by 41.437% with increasing 3 % but, the undrained strength decreased with 5% of sawdust. Also the results obtained from unconfined compression test and UU triaxial test were compared and looked at compatibility of the results. TALAŞ KULLANIMININ KİLLİ SİLT ZEMİNİN KAYMA MUKAVEMETİ DAVRANIŞI ÜZERİNE ETKİSİ ÖZ Bu çalışma ile killi bir silt zeminin mühendislik özelliklerinin iyileştirilmesi amaçlanmıştır. Büyükçekmece İlçesinden elde edilen Zemin çalışmada kullanılmıştır. Zeminin ilk durumdaki mühendislik özellikleri laboratuar deneyleri ile belirlenmiştir. 40 nolu elekten elenmiş kuru zemin %1, 2, 3 ve 5 oranlarında talaş ile karıştırılarak kompaksiyon deneyi yapılmış ve talaş katkısının zeminin mühendislik özelliklerine olan etkileri deneysel olarak araştırılmıştır. Bu çalışma sonucunda % 5 talaş katkısı ile likit limit, plastic limit ve plastisite indisinde sırasıyla %14.9, % 13.15 ve % 17.6 oranlarında düşüşler görülmüştür. Ancak bu düşüşlerin zeminin sınıfına bir etkisinin olmadığı belirlenmiştir. % 1 ile % 5 arasında değişen oranlarda talaş katkısnın zeminin drenajsız kayma dayanımı üzerine etkileri Serbest basınç deneyi ve üç eskenli basınç deneyi ile araştırılmıştır. Deneyler sonucunda %3 oranında karıştırılan talaş katkısının zeminin drenajsız kayma dayanımını %41.4 oranında arttırdığı ancak % 5 oranında ise drenajsız kayma dayanımı değerinin artış trendinin sona erdiği belirlenmiştir. Ayrıca serbest basınç deneyi ile elde edilen sonuçlar ile UU üç eksenli basınç deneyi ile elde edilen karşılaştırılmış ve sonuçlar arasındaki uyum incelenmiştir. Anahtar Sözcükler: Drenajsız kayma dayanımı, talaş, üç eksenli basınç deneyi, serbest basınç deneyi.
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Papers by Omar Hamdi Jasim