Evaluation Of Constitutive Soil Models In Soil Nail Wall Using Centrifuge Model

Numerical modeling is a strong tool for soil deformation in deep excavations. There are some kind of method such as finite element, finite difference and etc. Finite element method help to select the appropriate constitutive soil model with high accuracy. The controversy between simplicity and accuracy is an important issue always has been intrested in by the researchers. By using physical modeling the accuracy of each constitutive soil modeling could be asset. In this paper, four models of geotechnical centrifuges have been uesd to investigate the effect of the overburden distance from the edge of the excavation and the results of various constitutive soil models in the soil nailing wall. The results showed that the overburden distance from the edge of the wall is so effective on the value and pattern of wall deformation. By increasing the overburden distance from the edge of the excavation, the greatest amount of horizontal deformation of the wall leads to the bottom of the excavation. However, the basis of numerical solution, without the overburden distance from the edge of the excavations, this deformation always occurs in the top of the excavation. Also, based on the comparison of the results of centrifuge models and the results obtained from different behavioral models, in order to predict the vertical deformation of the top of the excavation, the result of hardening soil small strain model (HSS) is nearer to real than other investigated constitutive soil model.