Toprakarme ve zemin çivili bir derin kazı uygulamasının örnek bir proje üzerinde nümerik analizlerinin yapılması
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Tarih
2024
Yazarlar
Dergi Başlığı
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Cilt Başlığı
Yayıncı
Aksaray Üniversitesi Fen Bilimleri Enstitüsü
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In this study, detailed numerical analyses of a composite retaining structure in a deep excavation area located in Ankara Organized Industrial Zone were investigated. The deep excavation area was designed as an integrated soil nail/geosynthetic wall composition. The performance of the retaining elements that exhibit different behaviors in the design was investigated numerically. Soil shear strength values were obtained from deep field drillings in the field and these values were used in a finite element program. Engineering parameters for soil nail and geosynthetic materials were used within the framework of values obtained from the manufacturing companies and in accordance with the standards. In the analyses, the hardening soil model was used considering the temporary deep excavation period. The stepwise construction method was taken as basis in deep excavation modeling. In this way, the manufacturing period and steps were scenario-based on the numerical model. When the final depth of the deep excavation was reached, a slope stability analysis was performed for the entire section. In the analysis, the Phi/C reduction method was used. Plastic deformation points were determined in the possible shear section in the slope environment, then the collapse wedge was obtained. In order to provide sensitivity in the analyses, the soil-structure interfaces for soil nails and geosynthetic materials were defined and highlighted in the model with mesh densification. Within the scope of the analyses performed, it was observed that deep excavation could be constructed safely in this field study where two different deep excavation application methods were used together. It was observed that both geosynthetic reinforcement and soil nail material successfully connected the active wedge, which is likely to be mobilized, to the stable soil section in the soil environment exposed to tensile stresses. When the lateral deformations calculated by numerical analysis are less than 1% of the excavation depth, no collapse mechanism is observed in the excavation section, no slope stability problem is observed, and no stripping and rupture problems occur in the nail and geosynthetic material. It was understood that the numerical model can be used in composite improvement methods.
Açıklama
Anahtar Kelimeler
Geogrid, Nümerik Analiz, Şev Stabilitesi, Zemin Çivisi, Geogrid, Numerical Analysis, Slope Stability, Soil Nail
