Experimental comparison of stress-strain relationships of clay soils under freeze-thaw effect with Duncan-Chang model

Yıl 2022, Cilt: 11 Sayı: 4, 982 - 989, 14.10.2022

Veysel Özlü , Müge Elif Orakoğlu Fırat

https://doi.org/10.28948/ngumuh.1131247

Öz

In this study, the stress-strain relationships of clayey soil were estimated by Duncan-Chang model, and the mathematical relationships between model parameters and freeze-thaw cycles were explained. By examining the correlations between the experimental study and the model outputs, it was determined to what extent the model was able to predict the stress-strain relationships of clay soils under freeze-thaw cycles. As a result, the relationship between the numbers of the freeze-thaw cycle and Duncan-Chang model parameters was revealed by using different curve fitting functions. Gray correlation analysis showed that the freeze-thaw effect on the model parameters cannot be ignored. By creating model parameters in the tangent deformation modulus of the Duncan-Chang model, the variation of stress-strain curves under freeze-thaw cycles was obtained with high correlations for unconsolidated-undrained soils.

Anahtar Kelimeler

Freezing-Thawing cycles, Clay soil, Duncan-Chang model, Regression analysis

Donma-çözülme etkisi altındaki killi zeminlerin gerilme-deformasyon ilişkilerinin Duncan-Chang modeli ile deneysel karşılaştırması

Öz

Bu çalışmada, killi bir zemine ait gerilme-deformasyon ilişkileri Duncan-Chang modeli ile tahmin edilmiş olup, model parametreleri ve donma-çözülme çevrimleri arasındaki matematiksel ilişkiler açıklanmıştır. Deneysel ve matematiksel model sonuçları arasındaki korelasyonlar incelenerek, modelin donma-çözülme altındaki killi zeminin gerilme-deformasyon ilişkilerini ne ölçüde tahmin edebildiği belirlenmiştir. Sonuç olarak, farklı eğri uydurma fonksiyonları kullanılarak donma-çözülme döngü sayıları ve Duncan-Chang model parametreleri arasındaki ilişki ortaya konulmuştur. Grey korelasyon analizi, donma-çözülme etkisinin model parametrelerinin üzerindeki değişiminin göz ardı edilemeyeceğini göstermiştir. Duncan-Chang modelinin tanjant deformasyon modülünde bulunan model parametreleri oluşturularak, gerilme-deformasyon eğrilerinin donma-çözülme döngüleri altındaki değişimi konsolidasyonsuz- drenajsız zeminler için yüksek korelasyonlarla elde edilmiştir.

Anahtar Kelimeler

Donma-çözülme, Killi zemin, Duncan-Chang model, Regresyon analizi

Kaynakça

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