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Bu çalışmada Sahilkent (Bafra, Samsun) yöresindeki kil, silt ve kum boyutlu malzemelerden oluşan alüvyal zeminlerin sıvılaşma potansiyeli CPT verileri kullanılarak araştırılmıştır. Çalışma kapsamında Bafra ilçesi genelinde her biri 15 metre derinliğinde 20 adet sondaj yapılmış, bunlardan Sahilkent yöresindeki 5 tanesinden UD tip örnek alıcılarla her 1 metrede 1 adet olacak şekilde örselenmemiş zemin örnekleri temin edilmiştir. Bu örneklerden silt ve kum oranı yüksek olan 20 tanesi üzerinde ıslak elek, hidrometre, plastik limit, likit limit ve doğal su muhtevası tayinleri yapılmıştır. Yapılan ön değerlendirmede farklı derinliklerdeki bazı bölgelerde sıvılaşma potansiyelinin olduğu belirlenmiş ve detaylı sıvılaşma analizlerin yapılabilmesi amacıyla 5 sondaj kuyusunun 1’er metre yakınında 15’er metrelik CPTu deneyi uygulanmıştır. CPTu deneylerinde koni uç direnci, kenar sürtünmesi, efektif gerilme, rölatif sıkılık vb. veriler her 5 cm’de bir kaydedilmiş, sıvılaşma analizlerinde bu verilerin her 1 metre derinlik için ortalamaları alınmıştır. Sıvılaşma analizleri Mw=7.2’lik bir deprem senaryosu için yapılmış ve çalışma alanındaki 15 metrelik zemin katmanının sıvılaşma potansiyeli belirlenmiştir. Yapılan analizler sonucunda Sahilkent yöresinde Mw=7.2’lik bir deprem senaryosu için herhangi bir sıvılaşma olayının gerçekleşmeyeceği belirlenmiştir. Alüvyon malzemesinin ince daneli malzeme oranının yüksek olması, var olan kum ve siltli kum seviyelerinin ise çok sıkı ince daneli zemin katmanları arasında yer almasının zeminin sıvılaşmaya karşı mukavemetini arttırdığı düşünülmektedir.
In this study, it was studied using the CPT data of the liquidation potential of aluminum soils consisting of curve, silk and sand-size materials in the coast of Sahilkent (Bafra, Samsun). In the framework of the study, in the whole of the Bafra district, each of them was made in a depth of 15 meters, of which 5 in the coastal area were provided with UD type sample recipients and unarmed ground samples that will be 1 in each 1 meters. More than 20 of these samples, with a high ratio of silk and sand, have been identified with wet elephant, hydrometer, plastic limit, liquid limit and natural water mixture. In the pre-evaluation made, a CPTu experiment of 15 meters was implemented near 1 meter of the 5 extraction hole in order to determine the liquidation potential in some areas of different depths and to perform detailed liquidation analyses. In the CPTu experiments, the end resistance, the edge stretching, the effective stretching, the relatively tightness, etc. The data is recorded one per 5 cm, and the fluidity analysis takes the average of these data for every 1 meter depth. Fluidization analyses were made for a earthquake scenario of MW=7.2 and the fluidization potential of the 15 meters floor layer in the work area was determined. According to the analysis, there will be no liquidation event for a MW=7.2 earthquake scenario in the coastal area. It is believed that the high rate of the thin dancing material of the aluminum material, while the existing levels of sand and silk sand are located among the very tight thin dancing floor layers increases the strength of the soil against fluidity.
In this study, liquefaction potential of the alluvial soils consisting of clay, silt, and sand sized materials in Sahilkent (Bafra, Samsun) area was investigated using CPT data. Within the scope of the study, 20 boreholes each having a depth of 15 meters were drilled throughout Bafra district, and one undisturbed soil sample were obtained per meter from 5 of these boreholes located in Sahilkent area. Wet sieve, hydrometer, plastic limit, liquid limit, and natural water content determinations were conducted on 20 samples with high silt and sand content. In the preliminary evaluation, it was determined that there is a liquefaction potential in some regions at different depths, and in order to perform detailed liquefaction analyses, 15-meter-deep CPTu were carried out in 1 meter distance from those 5 borehole locations. In CPTu tests, data including cone tip resistance, sleeve friction, effective stress, relative stiffness, etc. were recorded every 5 cm, and average values of these data for each meter depth were used in the liquefaction analysis. Liquefaction analyses was conducted for an earthquake scenario of Mw = 7.2 and the liquefaction potential of the 15-meter soil layer in the study area was determined. As a result of the analyses, it was determined that no liquefaction will occur for an earthquake scenario of Mw = 7.2 in Sahilkent region. It is thought that high fine-grained content of the alluvium, and the fact that existing clean sand levels are located between fine-grained soil layers increase the resistance of the soil against liquefaction.
Field : Fen Bilimleri ve Matematik; Mimarlık, Planlama ve Tasarım; Mühendislik; Ziraat, Orman ve Su Ürünleri
Journal Type : Uluslararası
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