Abstract
This paper discusses a finite element analysis of shallow footing subjected to axial loading rested on different types of cohesive soil by using a computer program called PLAXIS-3D (V.20) software. The behavior of cohesive soil is simulated using several constitutive models (Mohr-Coulomb model, Hardening soil model, and Hardening soil with small strain stiffness model in order to find the best match between theoretical and experimental results).Two cases are considered square and rectangle. Moreover, some parameters that affect the load settlement relation curve; such as internal friction angle and soil modulus elasticity were investigated. It was found that the simulation by the Hardening soil model with small strain stiffness gives better results in both cases of the square and rectangle (C=25) and square footing (C=70). It was also observed that increasing the foundation width led to increases in bearing capacity, however, there was an increase of bearing capacity to about (9.45 %) for an increase in footing width of (6.25), so it was about (17%) for (12.5). For square footing in stiff clayey soil, the bearing capacity of the soil increases to about (23%) when the range of the modules of elasticity of soil increases from (10000 to 30000KN/m2).
Highlights
Shallow foundations are extensively used for the purpose of supporting structures of all sizes and derive their bearing capacity from the soil that supports them
Waheed and Asmael [13] carried out a numerical analysis using the Plaxis-3D program on the behavior of shallow foundation rested on clayey soil and subjected to vertical axial loading
It was seen that the simulation by the Hardening soil model with small-strain stiffness gives better results contrasted with Mohr-Coulomb because the Hardening models elastoplastic and its simulation is closer to the soil behavior
Summary
Shallow foundations are extensively used for the purpose of supporting structures of all sizes and derive their bearing capacity from the soil that supports them. They are regularly inserted up to some meters into the soil strata to get a suitable soil. Because the nature of the soil is complex, the development of constitutive models is able to know the ‘true’ behavior of the soil. It is considered the important aspect of analyzing geotechnical structures, like guess of shallow foundation settlements. The research goal is to explore the best matching of the finite element model with the experimental load-displacement curve using different finite element models and to study the effect of some parameters on the load settlement relation curve like the size of footing, modulus of elasticity, and internal friction angle
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