Nail ÜNSAL, Ayhan GÜRBÜZ, Adem IŞIK, Evren ŞİŞMAN

Fethiye yerleşim alanındaki zeminlerin spt ve kayma dalga hızı verileriyle sıvılaşma potansiyelinin değerlendirilmesi

Türkiye deprem kuşağında yer alan ve deprem geçmişi olarak aktif bir tarihe sahip olan ülkedir. Sıvılaşma ülkemizde 1992 Erzincan depreminden sonra önemli hale gelmiş ve daha sonra 1999 Marmara ve Düzce depremlerinde de geniş olarak gözlenmiştir. Bu çalışma kapsamında Muğla ili, Fethiye ilçesi inceleme alanında senaryo bir deprem büyüklüğüne göre sıvılaşma potansiyelinin belirlenmesi amacıyla bölgede 40 ayrı noktada Standart Penetrasyon Deneyi (SPT) ve sismik kırılma deneyleri yapılmıştır. SPT ve sismik kırılma deneyleri çakışacak şekilde aynı noktalarda yapılması amaçlanmış ve böylece sonuçlar aynı noktada iki ayrı farklı yöntemle elde edilerek karşılaştırılmıştır. İnceleme alanında SPT darbe sayıları, yeraltı su seviyesi, ince dane oranı ve kayma dalgası hızı verilerine göre sıvılaşma analizi yapılarak sıvılaşma risk indeksine göre sıvılaşma risk haritaları hazırlanmıştır. Yapılan çalışmalar sonucunda Mw=7,0 büyüklüğünde senaryo bir deprem durumunda inceleme alanının büyük bir bölgesinde sıvılaşmanın olmayacağı veya düşük seviyede sıvılaşma olabileceği sonucuna varılmıştır.

Assessment of liquefaction potential of fethiye based on spt and shear wave velocity

Turkey, located at an area of active seismic zone, has vast records of many earthquakes. The liquefaction phenomena have become crucial issue in Turkey since Erzincan Earthquake took place in 1992. Soil liquefaction was observed widely during Marmara and Duzce Earthquakes in 1999 as well. In this study, the liquefaction potential of vicinity of Fethiye village in Turkey was investigated via results of blow counts (N) of Standard Penetration Test (SPT) and velocity measurements of seismic refraction tests at 40 different locations in the investigated area under an earthquake magnitude (Mw) of 7.0. Liquefaction severity maps were prepared according to liquefaction severity index that is function of the input parameters such as SPT-N values, ground water level, fines content and shear wave velocity. The results of study reveal that the investigated area has either no potential liquefiable or low susceptibility liquefiable zones under Mw=7.0.

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