Heave and bearing capacity of shallow foundation on expansive soil using a 3D numerical modeling approach

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4. Heave and bearing capacity of shallow foundation on expansive soil using a 3D numerical modeling approach

The hydration of the expansive clay soils induces a significant increase in the soil volume which, will therefore cause a differential heave of the shallow foundations. Hence, a serious study is needed to evaluate the effect of swelling potential soil on the foundation heave and bearing capacity. The main objectives of this study are to propose a simplified numerical model which it is based on the stress state of the swelling soil under the foundation. As well as determine the heave for different loads applied to the footing and the load-bearing capacity for different swelling pressures. A three-dimensional numerical model based on the simulation of the swelling pressure (SSP) in the initial state was proposed, followed by an elastoplastic behavior model to calculate the foundation heave and bearing capacity. The analyses were performed using the finite-difference code FLAC 3D, carried out on a rigid square footing founded on a homogeneous expansive clay. The numerical results obtained are compared with the analytical solutions proposed in the literature. Therefore, the foundation heave and bearing capacity results obtained show that the 3D numerical model has a good agreement with the analytical solutions based on oedometer tests proposed in the literature.

18th African Regional Conference on Soil Mechanics and Geotechnical Engineering (ARCSMGE2024)

Foundation Engineering