Modélisation non-linéaire de l’interaction sol-pieustructure sous chargement cyclique

Djawhara, Hamouma (2023) Modélisation non-linéaire de l’interaction sol-pieustructure sous chargement cyclique. Doctoral thesis, SCIENCES ET DE LA TECHNOLOGIE.

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Abstract

The soil-structure interface phenomena are observed in various real-world civil engineering applications. Whether it involves contact with bedrock soil, fissures and joints in rock masses, or the interaction between soil-pile or soil-underground structures and multiple soil layers (such as the interface between an embankment and the foundation soil). The deterministic method, assuming the soil to be a homogeneous material, has been predominantly used to solve the soil-pile interaction problem by predicting the mechanical behavior of the soil-pile interaction system. However, soil properties exhibit random variations due to their diverse mechanical and physical characteristics. This randomness introduces uncertainty in the results, leading to the adoption of the probabilistic approach. This thesis work entails utilizing the Plaxis 2D software to conduct non-linear modeling of the soil-pile interaction system under cyclic axial stress in a homogeneous ground. The goal is to explore the behavior of the soil-pile interface through numerical analysis. Additionally, the study investigates the interaction between cohesive soil and a pile at great depths in heterogeneous soil using the OptumG2 software. The focus is on examining the impact of spatial variability in soil cohesion. The findings from the deterministic analysis highlight the significant influence of roughness on shear stress at the contact interface during cyclic loading. Meanwhile, the results of the probabilistic study demonstrate that the bearing capacity of the soil-pile interaction system is notably affected by the random field of shear strength properties

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