Time settlement evaluation of piled-raft systems supported on clayey soils in Bogotá D.C., using 3D FEM
DOI:
https://doi.org/10.4067/s0718-28132018000100006Keywords:
Clays of Bogotá D.C, Total settlement, 3D finite elements, Piled-raft, Rocscience RS3Abstract
This document presents the analyses of a piled-raft system foundation constructed on a typical stratigraphic profile of clays in Bogotá D.C. The stratigraphy was defined using 57 exploration records and 16 piezocone tests from geotechnical studies for the first line of the Metro projected in this city. A 4-layer average soil model was established and the geotechnical parameters for each layer were defined from USCS classification, unit weight, direct shear, unidimensional consolidation, unconfined compression and triaxial CU tests. Based on this geotechnical information, a 3D FEM analysis was performed for this study. 54 geometric combinations between length, diameter, separation between centres of vertical elements and raft thickness, were established to estimate the total settlements taking into account the construction process (300 days) and later on to 20 years for a 15 floors building without basements. In addition, total settlements were estimated using the methodologies of Equivalent Raft, Equivalent Pile, Poulos y Davis, and Poulos-Davis-Randolph to find the maximum number of piles needed to find the 20-year maximum settlement proposed by NSR-10 (2010) Title H (30 cm). Finally, the global construction cost analysis was performed for all the geometrical configurations and settlement methodologies proposed.
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