Soil-pile interaction mechanisms under compressive service load
Soil-pile interaction mechanisms under compressive service load
The evaluation of the response of piles subjected to compressive load is a common geotechnical problem. For non-displacement piles, the contribution of the lateral resistance for the global equilibrium is typically substantial under the service load level. For instance, the lateral resistance can be mobilised for small soil-shaft relative displacements, but the base resistance requires much larger displacements. Due to the pile's shortening and toe displacements, a narrow shear band is formed in the soil surrounding the pile's shaft, which is responsible for most lateral resistance development. In this shear band, shear and volumetric strains of complex evolution occur. However, the induced shear strain will be related to the thickness of the shear band, with the mobilised resistance and with the elastic shortening of the pile and toe displacements. In this work, a simplified model is presented to evaluate the order of magnitude of the shear band strain and its variation in depth, to understand the influence of the shear band thickness and the influence of the axial stiffness of the pile in the mobilisation of the shaft resistance even at very small toe displacements.
J. C. Lourenco; J. A. Santos
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
A - New developments on structural design
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