Siltli Kumlarda Gerilme Kontrollü ve Deformasyon Kontrollü Sıvılaşma Testlerinin Karşılaştırılması

Year 2020, Volume: 7 Issue: 1, 322 - 337, 31.01.2020

Yetiş Bülent Sönmezer

https://doi.org/10.31202/ecjse.621605

Abstract

Deprem esnasında farklı tane
çaplarında ve ince tane içeriğindeki siltli kumların sıvılaşma davranışı aynı
olmayıp bu tür zeminlerin sıvılaşma mekanizmasını anlamak geoteknik deprem
mühendisliğinin önemli konularından biri olmaya devam etmektedir. Bu amaçla, bu
çalışmada iki farklı gradasyondaki 20/30 ve 30/50 kumlarına, %5 ve %30 oranında
silt karıştırılarak hazırlanan siltli-kum numuneleri üzerinde, dinamik basit
kesme test cihazı kullanılarak deformasyon kontrollü ve gerilme kontrollü
testler gerçekleştirilmiştir. Sonuçlar deformasyon kontrollü ve gerilme
kontrollü testlerin sonuçları arasında anlamlı bir fark olmadığını
göstermiştir. Ancak silt içeriğinin artışı ile hem 20/30 kumu ve hem de 30/50
kumuna ait siltli-kum numunelerinin sıvılaşmaya karşı dirençleri azalmıştır.
Ayrıca rölatif sıkılığın artışı ile tüm numunelerin sıvılaşmaya karşı direnci
artmıştır.

Keywords

Sıvılaşma, Kum, Silt

Comparison of Stress Control and Deformation Controlled Liquefaction Tests in Silty Sands

Abstract

The
liquefaction behavior of silty sands with different grain diameters and fine
grain content during the earthquake is not the same and understanding the
liquefaction mechanism of such soils continues to be one of the important
subjects of geotechnical earthquake engineering. For this purpose, deformation
controlled and stress-controlled tests were performed on silty-sand samples
prepared by mixing 5% and 30% silt to 20/30 and 30/50 sands of two different
grades using cyclic simple shear tester. The results showed that there was no significant
difference between the results of deformation controlled and stress-controlled
tests. However, with the increase of silt content, the resistance to
liquefaction of silty-sand samples of both 20/30 sand and 30/50 sand decreased.
In addition, the resistance to liquefaction of all samples increased with
increasing relative density.

Keywords

Liquefaction, Sand, Silt, Cyclic Simple Shear Test

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