Killi Zeminin Kayma Mukavemetine Cam Lifi ve Su İçeriğinin Etkisi

Öz

Günümüzde yüksek mukavemetleri ve ekonomik olmaları nedeniyle rastgele dağıtılmış ayrık lifler ile zeminlerin güçlendirilmesi tekniği geleneksel zemin güçlendirme tekniklerine bir alternatif olarak öne çıkmaktadır. Mevcut çalışmada düşük plastisiteli kil zeminin kayma mukavemeti özellikleri üzerine cam lif ilavesi ve su içeriğinin etkileri araştırılmıştır. Bu amaç için üç farklı su içeriğinde; optimum su muhtevasında, altında ve üstünde (%13, %15 ve %17) ve ağırlıkça üç farklı lif oranında (%1,0, %1,5 ve %2) lif-kil karışımları hazırlanmıştır. Hazırlanan numunelerin kayma mukavemetleri direkt kesme deneyinde incelenmiştir. Sonuç olarak en yüksek kohezyon, içsel sürtünme açısı ve kayma mukavemeti değerlerinin %13 ve %15 su muhtevası için sırasıyla %1 ve %1,5 lif içeriklerinde meydana geldiği gözlenmiştir. Buna karşılık %17 su muhtevası için optimum bir lif içeriğinin gözlenmediği, lif içeriğinin artması ile bu değerlerin sürekli arttığı sonucu elde edilmiştir. Ayrıca su içeriğinin artması ile lif-zemin arası adezyon etkisinin azalması sonucu kayma mukavemetinin azaldığı görülmüştür.

Anahtar Kelimeler

• Cam lif
• Zeminlerin güçlendirilmesi
• Su içeriği
• Direkt kesme deneyi
• Kayma mukavemeti

The Effect of Glass Fiber and Water Content on Shear Strength of Clayey Soil

Abstract

Today, the reinforcement with randomly distributed discrete fibers of soils stands out as an alternative to traditional soil reinforcement techniques due to their high strength and being economical. In the present study, the effects of glass fiber addition and the water content on the shear strength properties of low plasticity clay soil were investigated. For this purpose, fiber-clay mixtures were prepared at optimum water content (OWC), below OWC and above OWC (13%, 15% and 17%) and three different fiber ratios (1.0%, 1.5% and 2%) by weight. Shear strengths of the prepared samples were investigated in direct shear test. As a result, it was observed that the highest cohesion, internal friction angle and shear strength values occurred at 1% and 1.5% fiber contents for 13% and 15% water content, respectively. On the other hand, it was concluded that an optimum fiber content was not observed for 17% water content, and these values increased continuously with increasing fiber content. In addition, it was observed that the shear strength decreased as a result of the reducing in the adhesion effect between the fiber and the soil with the increase in the water content.

Keywords

• Glass fiber
• Soil reinforcement
• Water content
• Direct shear test
• Shear strength

Kaynakça

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