عنوان مقاله [English]
Effect of ground deformation on adjacent building caused by excavation is one of the main concerns in the construction of underground facilities in urban areas. The performance of soil nail walls is significantly affected due to the complex mutual interaction between its main components including the native soil, the reinforcement (nails) and the facing. Additionally, various other factors, such as the construction sequence, the installation method of nails, the connection between the nails and the facing, are also likely to influence the behavior of the soil nail walls. In practice, to study the complex soil-structure interaction and assess the performance of soil nail walls, often numerical simulations are performed. It is well established that the accuracy of numerical simulations depends significantly on the constitutive soil model used. In the present study, excavation in soft and stiff clay using hardening soil model, softening soil model, and Mohr-Coulomb model and also in loose and dense sand using hardening soil model and Mohr-Coulomb model is simulated using the finite element software ``Plaxis''. According to the results, considerable dependency of deformation of ground and side wall of excavation on the selected constitutive model is obvious. Based on obtained results, Mohr-Coulomb model predicts swilling at ground surface for points around the side wall. Hardening soil model and Mohr-Coulomb model predict maximum and minimum lateral deformations of side wall, respectively, but the deformation trends of side wall are quite different due to the two models. The modeling results of loose and dense sands show the amount of predicted swilling at the bottom of the excavation using Mohr-Coulomb model is more than hardening soil model result. In this study, the maximum and minimum amounts of swilling at bottom of the excavation for soft clay are calculated by Hardening soil model and softening soil model, respectively. The results of stiff clay show the maximum and minimum amounts of swilling at bottom of excavation and near the side wall predicted by hardening soil model and Mohr-Coulomb model, respectively, but away from the side wall, softening and hardening soil models predict maximum and minimum amount of swilling, respectively.