SPT Based Liquefaction Hazard Assessments in Igdır City (Türkiye)

Yıl 2024, Cilt: 40 Sayı: 1, 148 - 166, 30.04.2024

Yusuf Guzel , Muhammed Alperen Ozdemir

Öz

Seismically active regions are always prone to be subjected to earthquake events and their eventual damages to urban areas. Liquefaction is one of the earthquake related incidents occurring within soil bodies during or after earthquake excitations. Gaining the knowledge of liquefaction potential for a site is exceedingly crucial in view of seismic risk mitigation, earthquake hazard assessments and future planning of urban areas. This study evaluates the liquefaction potential of Igdır city located in the eastern-side of Türkiye, having borderlines with three other seismically active countries in the region, Armenia, Nakhichevan and Iran. Soil data (i.e., Standard Penetration Test values, water table, water content, unit weight, grain size distribution and Atterberg limits) at the considered areas within the city is gathered from 85 boreholes. After investigating the fault lines around the city, the two possible maximum peak ground accelerations involved in this study are determined to be 0.393g and 0.225g. Liquefaction susceptibility maps of the areas at the two peak ground acceleration levels are designated in regard to liquefaction potential index and liquefaction severity index methods. The studied areas in the city exhibit various levels of liquefaction susceptibility as the severity is observed to be greater under the larger peak ground acceleration.

Anahtar Kelimeler

Seismic intensity level, Standard penetration test, Liquefaction potential index, Liquefaction severity index, Liquefaction potential mapping

SPT Based Liquefaction Hazard Assessments in Igdır City (Türkiye)

Öz

Sismik olarak aktif bölgeler her zaman deprem olaylarına ve bunların kentsel alanlara nihai zararlarına maruz kalmaya eğilimlidir. Sıvılaşma, deprem uyarımları sırasında veya sonrasında zemin içerisinde meydana gelen olaylardan biridir. Bir sahanın sıvılaşma potansiyeli hakkında bilgi edinmek, sismik riskin azaltılması, deprem tehlikesi değerlendirmeleri ve kentsel alanların gelecekteki planlaması açısından son derece önemlidir. Bu çalışma, Türkiye'nin doğusunda yer alan ve bölgedeki diğer üç sismik olarak aktif ülke olan Ermenistan, Nahçıvan ve İran ile sınırı bulunan Iğdır şehrinin sıvılaşma potansiyelini değerlendirmektedir. Şehir içinde ele alınan alanlardaki zemin verileri (Standart Penetrasyon Testi değerleri, su tablası, su içeriği, birim hacim ağırlık, tane boyutu dağılımı ve Atterberg limitleri) 85 sondaj kuyusundan toplanmıştır. Şehir çevresindeki fay hatları incelendikten sonra, bu çalışmada yer alan iki olası maksimum yer ivmesi 0.393g ve 0.225g olarak belirlenmiştir. En büyük iki yer ivmeleri altında çalışma sahalarının sıvılaşma duyarlılık haritaları, sıvılaşma potansiyel indeksi ve sıvılaşma şiddet indeksi yöntemlerine göre belirlenmiştir. Şehirde incelenen alanlar, maksimum yer ivmesi altında şiddetin daha fazla olduğu gözlemlendiğinden, çeşitli seviyelerde sıvılaşma duyarlılığı sergilemektedir.

Anahtar Kelimeler

Sismik şiddet seviyesi, Standard Penetrasyon deneyi, Sıvılaşma potansiyel indeksi, Sıvılaşma şiddet indeksi, Sıvılaşma potansiyel haritası

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