Silt Kum Karışımlarının Sıvılaşma Davranışı ve Sıvılaşma Sonrası Hacimsel Deformasyon Özellikleri

Year 2016, Volume: 27 Issue: 4, 7593 - 7617, 01.10.2016

Eyyüb Karakan Selim Altun

Abstract

Sunulan çalışmada, silt kum karışımlarının sıvılaşma
davranışları ve sıvılaşma sonrası hacimsel deformasyon özellikleri araştırılmıştır.
Çalışma, İzmir Bayraklı bölgesinden temel kazısı sırasında elde edilen silt kum
karışımı ile gerçekleştirilmiştir. Yapılan çalışmada silt içeriğinin sıvılaşma
dayanımına etkisinin araştırılması için 8 farklı ince tane içeriğinde (FC=%0,
5, 10, 20, 40, 60, 80,100) dinamik üç eksenli deney aleti ile JGS 0542-2000
standardına uygun olarak drenajsız deneyler gerçekleştirilmiş ve deneyler
sonucunda hacimsel deformasyon özelliklerinin belirlenmesi için drenaj vanaları
açılarak çıkan su miktarları büret yardımıyla ölçülmüştür. Sıvılaşma deneyleri
rölatif sıkılık yerine, artan silt içerikleri ile birlikte kaba daneler ve ince
daneler arası boşluk oranı kavramlarına göre sıvılaşma kriterleri
belirlenmiştir. Ayrıca bu durumda sıvılaşma dayanımında eşik silt içeriği
bulunmuştur. Sıvılaşma sonrası hacimsel deformasyon davranışları ise silt
içeriğine bağlı olarak yorumlanmıştır.

Keywords

Silt kum karışımı, sıvılaşma, hacimsel deformasyon, kaba - ince daneler arası boşluk oranı

Liquefaction Behavior of Silt Sand Mixtures and Post Liquefaction Volumetric Strain Properties

Abstract

In this study, the
liquefaction behavior silty sand mixtures and volumetric deformation properties
were investigated. The study was implemented on samples of silt sand mixtures
obtained during an excavation at Bayraklı, Izmir, Turkey. In order to
investigate the liquefaction behavior of silty sand, undrained cyclic triaxial
compression tests were carried out according to JGS 0542-2000, for 8 different
fines contents (0, 5, 10, 20, 40, 60, 80, 100%). To determine the volumetric
deformation properties, the water content change was measured by allowing
drainage into a burette upon completion of a cyclic test. The liquefaction
criteria was determined by using intergranular-interfine void ratios. A
threshold fines content to serve as liquefaction criterion has also been
determined. The volumetric deformation properties behavior were reviewed
depending on the silt content.

Keywords

Silt Sand Mixtures, Liquefaction, Volumetric Strain, intergranular - interfine void ratios

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