Investigation of Shear Strength Behavior of Clayey Crushed Stone and Clayey Natural Gravel with Large Scale Direct Shear Tests

Year 2017, Volume: 19 Issue: 55, 122 - 131, 01.01.2017

Hasan Fırat Pulat

Abstract

Soils, classified according to their grain sizes, are
generally in a mixture in various proportions in the nature. In this
study, shear strength properties of clayey gravel samples which
prepared in three different compositions were investigated with
large scale direct shear tests. In order to investigate soil type,
particle size, shape and roughness effects on shear strength
properties, samples containing various grain sized gravel and
kaoline clay were prepared and experiments were conducted in
saturated condition. The results have shown that, crushed stone
sample containing bigger grain size had 10% bigger internal
friction angle than sample in same composition. It was observed
that, crushed stone had 16% bigger internal friction angle than
gravel sample prepared in same composition and grain sized.

Keywords

Large scale direct shear, Gravel, Shear strength, Crushed stone, Kaoline

Killi Kırmataş ve Killi Doğal Çakılların Kayma Mukavemeti Davranışlarının Büyük Ölçekli Direk Kesme Deneyleriyle İncelemesi

Abstract

Belirli dane boyutlarına göre sınıflandırılan zeminler
doğada genellikle çeşitli oranlarda karışım halinde bulunmaktadır.
Bu çalışma kapsamında 3 farklı kompozisyonda hazırlanmış kil -
çakıl numunelerinin kayma mukavemeti özellikleri büyük ölçekli
direk kesme deneyleriyle incelenmiştir. Çakıl türünün, dane
boyutunun, şeklinin ve pürüzlülüğünün kayma mukavemeti
üzerindeki etkisinin incelenmesi amacıyla çeşitli dane dağılımına
sahip kırmataş ve dere çakılları kaolin kiliyle belirli
kompozisyonlarda karıştırılarak numuneler hazırlanmış, doygun
durumda deneyleri yapılmıştır. Deneyler neticesinde kırmataş
içeren aynı kompozisyondaki iki numuneden, iri dane dağılımlı
numunenin %10 oranında daha büyük içsel sürtünme açısına
sahip olduğu belirlenmiştir. Aynı kompozisyon ve dane dağılımına
sahip iki numuneden kırmataş içeren numunenin, dere çakılı
içeren numuneden %16 daha büyük içsel sürtünme açısına sahip
olduğu belirlenmiştir

Keywords

Büyük ölçekli direk kesme, Çakıl, Kayma dayanımı, Kırmataş, Kaolin

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