A New Proposal for Adjusting the Load-Settlement and Ultimate Load Using the Logistic Adjustment
Keywords:Soft Soil, Building Foundation, Piles, Logistic Growth
The subsoil of the city of Recife is heterogeneous with deposits of soft soil scattered over the plain of the city at least 50% of its extension. In addition to layers of soft materials, stratigraphic profiles containing shells, coral fragments, sands and silts are found. Due to this heterogeneity of the subsoil profile and the real state increase, there was a considerable increase in constructions associated with land with low resistance. This fact favors the use of different types of foundation for each type of construction/terrain. The present work aims to propose a logistic adjustment developed by Verhulst, to be used as an adjustment of the load-settlement curve and to obtain the rupture load from static load tests. In order to validate the proposal, data from an infrastructure construction executed in Recife-PE, Brazil, with 822 laminated metallic piles in soft soil with low bearing capacity, considering the subsoil characterization tests (Standard Penetration Test), six static load tests (SLT) and nine dynamic load tests (DLT). The adjustment of the load-settlement curve obtained by the proposal shows that the load capacity values ??are very close to those measured by the DLT, while the average of the rupture loads obtained by the Van Der Veen method is double that found by the DLT; and coefficient of variation seven times greater. It is the first time that the Logistic Adjustment is used for applications in foundations and the proposal is very promising.
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