Investigation Of Effect Of Relative Density On The Liquefaction Potential Of Soils Of Saruhanlı (Manisa) Using Dynamic Triaxial Test

Year 2012, Volume: 2 Issue: 1, 26 - 41, 16.01.2012

Mehmet Orhan Ali Ateş

Abstract

This study includes the determination of the liquefaction potential of Manisa (Saruhanlı) region effect of relative density on liquefaction using seismic waves in field and dynamic triaxial test in laboratory. It was predicated that the Gediz Graben Fault Zone was a length of 150 km and to affect the region and approximately passed through in a distance of 33 km in the south of Saruhanlı District. In a probable earthquake effect, in case Gediz Graben was cracked 1/3 of the total length and it would produce as MW=7,1 and a max=0.28 g and the liquefaction analysis was performed and liquefaction map was prepared according to this approach. The samples were obtained from site according to the liquefaction hazard map and reconstituted basing on relative densities bounding to their own location relative densities in laboratory. They were subjected to stress-controlled cyclic loads sinusoidally according to the cyclic stress ratios obtained from site conditions conslidated to the stress which was exposed to the influence of geological overburden in-situ field stress. The tests were performed at the frequency of 0,5 Hz. In the end, under these conditions this sample was not liquefied and then in case, relative density rate reduced % 50 and redone the experiment, same sanple was liquefied. 

Keywords

Cyclic triaxial test, seismic velocity, liquefaction potential, Saruhanlı, Relative density

Rölatif Sıkılığın Saruhanlı (Manisa) İlçesi Zeminlerinin Sıvılaşmasına Etkisinin Dinamik Üç Eksenli Deneyi İle Araştırılması

Abstract

Bu çalışma Manisa (Saruhanlı) ilçesinde, alüvyal zeminlerin sıvılaşma potansiyelinin, sismik dalga hızı ve rölatif sıkılığın sıvılaşma üzerindeki etkisinin Dinamik üç eksenli deney kullanılarak belirlenmesininin araştırılmasını içermektedir. İlçenin yaklaşık 33 km güneyinde ve 150 km uzunluğundaki “Gediz Grabeni Fay Zonu”, bölgeyi etkileyebileceği varsayılarak, araştırmaya esas alınmıştır. Bu fay zonunun, olası bir depremde 1/3'nün kırılması tahmin edilmiş, moment magnitüdü 7,1 ve 0,28 g büyüklüğünde yatay deprem ivmesi oluşturabileceği hesaplanarak sıvılaşma analizleri yapılmış ve sıvılaşma haritası hazırlanmıştır. Risk haritasına göre sıvılaşan lokasyondan, numune alınmıştır. Laboratuvarda arazi şartlarına uygun ve lokasyondan alınan numunenin sahip olduğu rölatif sıkılık değerlerinde deney numunesi hazırlanarak arazide maruz kaldıkları efektif jeolojik yüke eşit oranda konsolide edilmiş ve gerilme kontrollü devirsel yükler sinüzoidal olarak uygulanmıştır. Boşluk suyu basıncı oluşumunu kontrol edebilmek için bütün deneyler 0,5 Hz yükleme frekansında yapılmıştır. Bu fay zonunun üretebileceği ivme şartlarında bu bölgenin sıvılaşmadığı ancak rölatif sıkılığın %50'e indirilerek tekrarlanması durumunda sıvılaşabileceği görülmüştür.

Keywords

Devirsel üç eksenli deney, Sismik dalga hızı, sıvılaşma potansiyeli, Saruhanlı, Rölatif sıkılık

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