Comparative Study of the Influence of the Fish Coefficient and Young's Modulus with the Hardening Soil Model and The Mohr-Coulomb Model on the Behavior of Cable-Stayed Bridge Piles

This article deals with the behavior of isolated piles subjected to two models used in geotechnics (Hardening Soil and Mohr Coulomb) under cyclic lateral loading and their head deformations compared to monotonic loading in sandy soil. The behavior of the cable-stayed bridge piers was predicted using PLAXIS 2D software, based on the results of in situ and laboratory geotechnical studies carried out by the control office for Building and Public Works (BCBTP). Numerical simulation is an alternative to the high cost of large-scale in situ and laboratory studies for describing the behavior of deep foundations. The results obtained show that piles subjected to lateral head loading cause a horizontal head displacement compared with the Hardening Soil and Mohr Coulomb models. Cyclic loading of a pile results in deformation of the soil mass at the surface. Lateral displacement increases with the first few cycles until it stabilizes, generating an irreversible residual displacement due to progressive soil plasticization. Lateral cyclic loading has a favorable influence on pile behavior under cyclic loading, due to the reversible effect on pile displacement.