Tebriz Metro 2 hattı boyunca sıvılaşmaya bağlı olarak meydana gelen oturma tehlikesi

Year 2018, Volume: 24 Issue: 6, 942 - 951, 18.12.2018

Masoumeh Ghasemian Rouzbeh Dabiri , Rahim Mahari

Abstract

Deprem nedeniyle sıvılaşma
meydana geldiğinde, zemin katmanlarının çözülmesi içinde bulunan veya yeraltı
yapılarına hasar verebilir. Son yirmi yılda, farklı deneysel yöntemler alan ve laboratuvar
test verilerine dayandırılarak hacimsel gerilme (zemin oturması) ve maksimum
kayma gerginliğini belirlemek için kullanıldı. Bu çalışmanın temel amacı, zemin
sıvılaşmasından sonra zemin oturma oranı oranının değerlendirilmesi ve
sıvılaşma potansiyel endeksi (LPI) ile oturma arasındaki çalışma ilişkisinin
değerlendirilmesidir. Tebriz Metro 2 Hattı boyunca Standard Penetrasyon testi
(SPT) 54 sondaj deliğindeki sonuçlarından zemin katmanlarının sıvılaşma
potansiyelini tahmin etmek için kullanıldı. Daha sonra hem kuru hem de doymuş
zemin katmanlarında sıvılaştırmaya bağlı olarak zemin katmanlarında oturma
oranı hesaplanmıştır. Devamında LPI hesaplanmıştır. Çalışmadan elde edilen
sonuçlar gösteriyor ki, doymuş zemin katmanlarındaki oturma oranının, yeraltı
su seviyesinin üzerindeki zemin katmanlardan belirgin derecede yüksek olduğunu
ve zemin katmanlarının yoğunluğunun arttığında oturma oranının ve zemin
hacimsel gerilimin azaldığını gösterdi. Ayrıca, zemin katmanlarında LPI ve
zemin oturma değerleri arasında iyi bir uyum var.

Keywords

Sıvılaşma, Standard penetrasyon testi (SPT), Zemin oturmasi (hacimsel gerilme), Sıvılaşma potansiyel indeksi (LPI), Tabriz Metro 2 hatti

Settlements hazard of soil due to liquefaction along Tabriz Metro line 2

Abstract

After
the occurrence of liquefaction due to earthquake, the settlement of soil layers
damage to structures located on the ground or the underground. In the last
two decades, different experimental methods were used to determine the rate of
volumetric strain (settlement) and maximum
shear strain based on field and laboratory test data. The main purpose of the
present study is the evaluation of the rate of settlement after the occurrence
of liquefaction in soils and study relationship between liquefaction potential
index (LPI) and settlement. The results of the standard resistance penetration
test along Tabriz Metro Line 2 used to estimate the liquefaction potential of
soil layers in 54 boreholes. Then, the value of settlement in soil
layers due to liquefaction in both dry and saturated soil layers were
evaluated. In continue, LPI was calculated. The
results of this study showed that the rate of settlement in saturated soil
layers was remarkably higher than the layers above the underground water level
and with an increase in the density of the soil layers, the rate of settlement
and soil volumetric strain decreased. Also, there is a good adoption between LPI
and settlement values in soil layers.

Keywords

Liquefaction, Standard penetration test (SPT), Settlement (volumetric strain), Liquefaction potential index (LPI), Tabriz Metro line 2

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