Pamukkale Univ Muh Bilim Derg. 2022; 28(3): 378-388 | DOI: 10.5505/pajes.2021.06606

Investigation of liquefaction induced settlements with PM4Sand constitutive model

Ozan Subaþý¹, Recep Ýyisan^2
1Turkish-German University, Faculty of Engineering, Department of Civil Engineering, Istanbul
²Istanbul Technical University, Faculty of Civil Engineering, Department of Civil Engineering, Istanbul

One of the most important factors that increase the destructive effects of earthquakes and structural damages is the soil deformations during strong ground motion. The liquefaction occurs especially in saturated sandy soils as a result of the sudden increase in pore water pressure during the earthquakes and leads to large deformations in the soil layer and serious damages to engineering structures. In this study, by using three different sand properties with relative densities of 35,55 and 75%, two-dimensional soil profiles were created and dynamic analyzes were carried out using fourteen different acceleration-time histories records. In the numerical analysis was performed with a finite element software and PM4Sand constitutive equations were used to model the liquefaction behavior of sand layers. The numerical analysis results were compared with the well-known semi-empirical methods in the literature. In addition, the relationships between the parameters used to define strong ground motion and the liquefaction-induced settlements obtained from numerical and semi-empirical analyzes were investigated.

Keywords: Liquefaction-Induced Settlements, PM4Sand Constitutive Equations, Numerical Analysis, Semi-Empirical Analysis, Earthquake Source Properties,

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Sývýlaþma nedeniyle meydana gelen oturmalarýn PM4Sand bünye modeli ile incelenmesi

Ozan Subaþý¹, Recep Ýyisan^2
1Türk-Alman Üniversitesi, Mühendislik Fakültesi, Ýnþaat Mühendisliði Bölümü, Ýstanbul
²Ýstanbul Teknik Üniversitesi, Ýnþaat Fakültesi, Ýnþaat Mühendisliði Bölümü, Ýstanbul

Depremlerin yýkýcý etkisini ve yapýsal hasarlarý arttýran en önemli faktörlerden biri, dinamik yükler altýnda zemin tabakalarýnda oluþan deformasyonlardýr. Özellikle suya doygun kumlu zeminlerde, kuvvetli yer hareketi sýrasýnda boþluk suyu basýncýndaki ani artýþ nedeniyle meydana gelen sývýlaþmalar, zemin tabakalarýnda büyük deformasyonlara yol açmakta ve mühendislik yapýlarýnda ciddi hasarlara neden olmaktadýr. Bu çalýþma kapsamýnda, rölatif sýkýlýðý %35,55,75 olan üç farklý kum zemin özellikleri kullanýlarak iki boyutlu zemin profilleri oluþturulmuþ ve on dört farklý kuvvetli yer hareketi kullanýlarak doðrusal olmayan dinamik analizler bir sonlu eleman yazýlýmýyla gerçekleþtirilmiþtir. Kum zemin tabakalarýnýn sývýlaþma davranýþýný modellemek için ise programda yer alan PM4Sand bünye denklemleri kullanýlmýþtýr. Elde edilen numerik analiz sonuçlarý literatürde yer alan ve iyi bilinen yarý-ampirik yöntemlerle karþýlaþtýrýlmýþtýr. Buna ek olarak, kuvvetli yer hareketini tanýmlamak için kullanýlan parametrelerle, numerik ve yarý-ampirik analizler sonucunda elde edilen sývýlaþma kaynaklý oturmalar arasýndaki iliþkiler incelenmiþtir.

Anahtar Kelimeler: Sývýlaþma Kaynaklý Oturmalar, PM4Sand Bünye Denklemleri, Numerik Analizler, Yarý-Ampirik Yöntemler, Deprem Kaynak Özellikleri,

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