Sıvılaşma Riskinin Azaltılması için Kullanılan Jet Grout Kolonlarının Verimliliği Üzerine Bir Sayısal Çalışma

Year 2022, , 210 - 229, 13.12.2022

Gizem Şahin , Onur Toygar , Mehmet Rifat Kahyaoğlu

https://doi.org/10.46464/tdad.1170304

Abstract

Kocaeli İli’ndeki bir trafo montaj-demontaj binasının bulunduğu arazide kapsamlı bir zemin etüdü yapılmış ve bu alanda sıvılaşma riskinin olduğu görülmüştür. Sıvılaşma riskini ortadan kaldırmak amacıyla jet grout kolonlar zemin iyileştirme yöntemi olarak seçilmiştir. Tasarımı yapılan jet grout kolonların imalatından sonra sıvılaşma riskinin ortadan kalkıp kalkmadığı, gerçekleştirilen analitik ve sayısal analizler ile incelenmiştir. Jet grout kolonların sıvılaşmayı önlemedeki etkinliği, efektif gerilme tabanlı sonlu elemanlar analizleri yapabilen MIDAS GTS NX programı ile UBCSAND bünye modeli kullanılarak, aşırı boşluk suyu basıncı oluşumu üzerinden değerlendirilmiştir. Ayrıca, jet grout kolonların sıvılaşabilir zemin tabakasındaki kayma gerilmeleri, kayma deformasyonları ve aşırı boşluk suyu basıncı dağılımları üzerindeki etkisi, jet grout kolonların farklı alan ve dayanım oranları için gerçekleştirilen parametrik analizlerle ortaya konmuştur.

Keywords

Jet Grout Kolon, Sıvılaşma, Sonlu Elemanlar Yöntemi, UBCSAND Bünye Modeli

Supporting Institution

Muğla Sıtkı Koçman Üniversitesi Bilimsel Araştırmalar Koordinatörlüğü Birimi

Project Number

18/001

Thanks

Bu çalışma, Muğla Sıtkı Koçman Üniversitesi Bilimsel Araştırmalar Koordinasyon Birimi tarafından 18/001 numaralı “Jet-Grout Kolonların Zemin İyileştirme Verimliliğinin Belirlenmesi Adına Bir Vaka Analizi” başlıklı proje ile desteklenmiştir. Bilimsel Araştırma Koordinasyon Birimi’ne desteğinden dolayı teşekkür ederiz. Ayrıca araştırmaya konu olan inceleme alanının verilerini bizlerle paylaşan İnş. Müh. Turgay Erdoğan’a da teşekkür ederiz

A Numerical Study on the Efficiency of Jet Grout Columns in Liquefaction Mitigation

Abstract

A comprehensive site investigation was carried out on the site in Kocaeli, where a transformer assembly-disassembly building was located, and it was observed that there was liquefaction risk in the area. Therefore, jet grout columns were selected as the soil improvement method. After the production of the designed jet grout columns, it was investigated whether the liquefaction risk was eliminated through analytical and numerical analyses. The effectiveness of jet grout columns in preventing liquefaction was evaluated in terms of the generation of excess pore water pressure by using UBCSAND constitutive model on MIDAS GTS NX software which can perform effective stress-based finite element analyses. In addition, the effect of jet grout columns on the variation of shear stresses, shear deformations and excessive pore water pressure ratios in liquefiable soils were examined through the parametric analyses performed for different area and strength ratios of jet grout columns.

Keywords

Jet Grout Column, Liquefaction, Finite Element Method, UBCSAND Constitutive Model

Project Number

18/001

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