عنوان مقاله [English]
Deep excavations in soft clayey soils usually cause excessive ground settlement
and wall movements due to the creep in soft soils. One of the commonly used
methods for predicting these displacements is numerical analysis, however, in
most cases for modeling soft clayey soils, soil behavior is considered to be
time-independent. So, the effect of excavation time and creeping in soft soils
are ignored. In this paper, the impact of the time of construction of the excavation and creep effect that occurs in soft soils are studied using three case studies. These three excavations are stabilized using a combination of soil anchorage and soil nailing methods. For studying the time influence and creep effect in soft soils with numerical modeling, excavations are modeled using three different soil constitutive models, namely Mohr-Coulomb, Hardening Soil (HS), and Soft Soil Creep (SSC) models. The real field records by installed in-situ instruments are employed to evaluate the performance of three constitutive models for simulating the excavation wall behavior. The obtained results show that for realistic simulation of the behavior of deep excavations, the construction time and the corresponding creeping behavior should be included in the numerical modeling procedure in order to better match the numerical predictions with the time-independent behavior of soft soils.