HELİSEL KAZIKLARDA NİHAİ BASINÇ TAŞIMA GÜCÜNÜN ÇARPAN ELASTOPLASTİK ANALİZ İLE BELİRLENMESİ

Öz

Eksenel basınç yüküne maruz helisel kazıklarda nihai taşıma gücü; silindirik kayma ve ayrık taşıma gücü yöntemleri denklemlerinden, kurulum torku değeri üzerinden ve helisel kazıklara ait yük-deplasman eğrilerinden belirlenebilmektedir. Bu çalışmada, eksenel basınç yükü etkisi altında kohezyonsuz gevşek zemine gömülü helisel kazıklar; sayısal olarak modellenerek sonlu elemanlar yöntemi çarpan elastoplastik analiz (MEPA) ile çözümlenmiştir. Farklı helis çapına (D), aralığına (s) ve sayısına (N) sahip helisel kazıklar, iki boyutlu eksenel simetri yaklaşımıyla OPTUMG2 geoteknik tasarım programında modellenmiştir. Her bir deney senaryosunda, yük artımsal olarak eksenel basınç uygulanan helisel kazıklar için yük-deplasman eğrileri elde edilmiş ve %5D sınır deplasman ölçütüne göre helisel kazıkların nihai basınç taşıma kapasiteleri hesaplanmıştır. Sayısal çözümlemelerde, helis geometrisindeki değişimlerin taşıma gücüne etkisi; deneysel sonuçlarla benzer bir eğilim sergilemiş; ancak deneylerde gözlemlenen daha yüksek kapasite artışlarının, gevşek zemindeki kurulum kaynaklı yerel sıkılaşma etkisinden ileri geldiği değerlendirilmiştir. Sonuç olarak, gevşek kum zemin için yapılan analizlerde sayısal modelin, deneysel verilerle (R2=0.81) ve analitik sonuçlarla (R2=0.89) yüksek düzeyde bir korelasyon gösterdiği belirlenmiştir.

Anahtar Kelimeler

• helisel kazık
• kohezyonsuz zemin
• gevşek kum
• eksenel yükleme
• sayısal analiz
• çarpan elastoplastik

Kaynakça

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