Bazalt Fiberle Güçlendirilmiş Doygun Silt Zeminin Mekanik Davranışının Deneysel İncelemesi

Artan çevresel problemlere çözüm bulabilmek için her alanda, özellikle de inşaat mühendisliğinde birçok yöntem uygulanagelmektedir. Örneğin zemin iyileştirmesinde yapay ve doğal malzemelerin kullanımı artarak devam etmektedir. Son yıllarda doğal bir malzeme olan bazalttan üretilen fiberler betonarme yapıların güçlendirmesinde yaygın bir şekilde kullanılmakta iken bazalt fiberlerin zemin iyileştirmesinde kullanılmasına yönelik çalışmaların sayısı son derece azdır. Buradan hareketle bu çalışmada doğal bir malzeme olan ve kirletici özelliği olmayan bazalttan üretilen bazalt fiberle güçlendirilmiş ve konsolide edilmiş doygun silt zeminin mekanik özelliklerinden kayma direncindeki artış incelenmiştir. Çalışmada, öncelikle doğal, sonrasında 6 mm, 12 mm ve 24 mm uzunluğundaki bazalt fiberlerin silt zemine %1, %1.5 ve %2 oranında katılmasıyla elde edilen numuneler 100 kPa düşey gerilme altında konsolide edilmiş ve doygun haldeki silt zeminden elde edilen toplam 40 numune üç eksenli hücre kesme deneyine tabi tutulmuştur. Deney sonuçlarına göre; doğal silt zemine basalt fiber ilavesi denenen her durumda drenajsız kayma direncini artırmış, en iyi iyileştirme 24 mm boyundaki fiberin %1.5 oranında zemine karıştırıldığı durumda elde edilmiştir.

Anahtar Kelimeler:

Zemin iyileştirme, konsolide edilmiş doygun silt zemin, bazalt fiber, üç eksenli deney

Experimental Investigation of Mechanical Behavior of Basalt Fiber Reinforced Saturated Silty Soil

In order to find solutions to the increasing environmental problems in general and civil engineering in particular, several methods have been adopted. For example, synthetic and natural materials are increasingly used for soil improvement. In recent years, basalt fibers have been used for reinforcing concrete. But it is difficult to find the articles on the use of basalt fibers to strengthen the soil. It is in this perspective that this work is oriented on the study of mechanical behavior of consolidated saturated silty soils reinforced by basalt fibers. This study is conducted by using basalt fiber which is a natural and non-polluting material to improve the mechanical and physical properties of the soil by offering additional resistance to shear strength. The study involves adding different percentages (1%, 1.5% and 2%) of basalt fibers of different lengths of 6 mm, 12 mm and 24 mm in the silty soil. To properly conduct this study, 40 triaxial undrained unconsolidated tests (UU) were conducted on saturated silty soils which were consolidated under 100 kPa vertical stress. The results of these tests show that the addition of the basalt fiber has greatly enhanced the shear strength of the soil used in this study. The best improvement is observed for basalt fiber at 1.5% and 24 mm long. This improvement is expressed by an increase in the cohesion of this soil.

Keywords:

Soil improvement, consolidated saturated silty soil, basalt fiber, triaxial test,

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[1]. Ling I, Leshchinsky D, Tatsuoka F., Reinforced Soil Engineering: Advances in Research and Practice, Marcel Dekker Inc., 510 pp., 2003.
[2]. Jones M., Mechanics of Composite Materials, 2nd ed., Taylor and Francis, 519 pp, 1999.
[3]. Mukherjee K., Mishra A.K., Balaji Mudaliyar A., “A review on consolidation and strength behaviour of fiber reinforced expansive soil”, 50th Indian Geotechnical Conference, 2015.
[4]. Binici H., Aksogan O., Shah T., “Investigation of fibre reinforced mud brick as a building material”, Construction and Building Materials, vol. 19, pp: 313–318, 2005 (doi:10.1016/j.conbuildmat.2004.07.013).
[5]. Athanasopoulou A, Kollaros. G., “Improvement of soil engineering characteristics using lime and fly ash”, European Scientific Journal, special edition, pp: 132-141, 2016.
[6]. Keskin E, Turan B, Arsoy S., “Effect of thermal stabilization and lime stabilization on unconfined compressive strength (in Turkish)”, 3rd Geotechnical Symposium, pp: 515-522, Çukurova University, Adana, 2009.
[7]. Freilich, B.J., Li, C., Zornberg, J.G., “Effective shear strength of fiber-reinforced clays”, 9th International Conference on Geosynthetics, pp: 1997-2000, Brazil, 2010.
[8]. Sert S., Ndepete C.P., Beycioğlu, A., “Estimation of undrained shear strength of basalt fiber reinforced silty soils by using fuzzy logic approach”, 2nd International Conference on Computational and Experimental Science and Engineering, Antalya, Turkey, 2015.