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The present article disseminates the evaluation of the N’q factor to calculate tip load capacity of individual piles, obviously as a function of the internal friction angle of the support soil of the pile tip. The evaluation of the factor is by means of numerical analysis with the finite element method. The numerical model considers the pile axisymmetric geometry, the pile embedding in a granular deposit and pile-soil interface. The pile is modeled with solid elements and linear elastic behavior. The analysis considers a single hypothetical stratigraphy: cohesive soil 12 m thick, which overlies granular material. The behavior of the soils is elastoplastic with Mohr-Coulomb failure criterion. The parameters of soil strength are: a) cohesive soil, cohesion of 50.0 kPa and zero internal friction angle; b) granular soil, zero cohesion and internal friction angle variable between 25 to 45 degrees. The objective of this study is to determine the influence of the resistance of the supporting soil on the magnitude of the N’q factor and to compare the calculated factor with previous solutions commonly used in the geotechnical design of piles. The proposed factor is the result of a parametric-numerical analysis, where prior to the evaluation of the N’q factor, the influence of the effective embedment depth is considered.
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