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Anizotropik Yükleme Koşullarında Eksenel Deformasyon İle Sıvılaşma İlişkisi

Relationship Between Axial Strain and Liquefaction under Anisotropic Loading Conditions

Journal Name:

  • Jeoloji Mühendisliği Dergisi

Publication Year:

  • 2012

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Soil liquefaction has been extensively defined via the laboratory and in-situ tests, regarding to either the generation of excess pore water pressure or the soil vertical strain reaching a particular level under isotropic and anisotropic conditions. In this study, concolidated-drained anisotropic loading conditions were applied herein to simulate the stresses under a shallow foundation at representative depths. Three different particle size of sandy soils with two different relative density conditions were adopted for the saturated drained cyclic tests. The number of cycle load (26 cycles) within a frequency of 1second was chosen depending on a constant earthquake magnitude. The variation of axial strain during the tests was monitored in order to evaluate the liquefaction behaviour of the three types of the sands. The axial strain is found to be relative density dependent. Ione sand and beach sand samples could not reach the initial liquefaction state due to dilation. Especially, the least uniform and coarsest concrete sand with 90 % relative density tends to liquefy based on the axial strain.
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Abstract (Original Language): 
Zemin sıvılaşması arazi ve laboratuvar deneyleri ile ayrıntılı olarak incelenmektedir. İzotrop ve anizotrop gerilme koşullarında eksenel deformasyon ve boşluk suyu basıncı gelişimine bağlı olarak farklı sıvılaşma tanımları geliştirilmiştir. Bu çalışmada, konsolidasyonlu-drenajlı anizotropik devirsel üç eksenli deneyler üç farklı tane boyu dağılımına sahip, iki farklı bağıl yoğunlukta hazırlanan suya doygun örselenmiş kumda yapılarak, sıvılaşma davranışları incelenmiştir. Deneylerde uygulanacak gerilmeler farklı derinliklerde, yüzeyde tekil bir temel bulunacak şekilde hesaplanmıştır. Deneylerde yükleme frekansı 1 saniye (s), devir sayısı ise sabit bir deprem büyüklüğüne göre 26 olarak seçilmiştir. Üç farklı kum için eksenel düşey deformasyonun değişimi takip edilerek sıvılaşma ile ilişkilendirilmiştir. Kum örneklerinde gevşek veya sıkı durumda farklı eksenel deformasyonlar gelişmiştir. Ione kumu ve sahil kumunda sıkışma evresinde gelişen kabarmalar, sıvılaşma başlangıcına ulaşılmasını engellemiştir. En iri taneli ve uniform olmayan beton kumunda eksenel deformasyona göre % 90 izafi sıkılıkta sıvılaşma potansiyeli belirlenmiştir.
FULL TEXT (PDF): 
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  • 2
115-123
  • Turkish

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Araştırma Makalesi/ Research Article
Jeoloji Mühendisliği Dergisi 36 (2) 2012 123
Journal of Geological Engineering 36 (2) 2012
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