Recalques de estacas com curvas de transferência de carga a partir de funções hiperbólicas em perfis de solos granulares

Abstract

Load capacity and settlements predictions are essential requirements for the design of foundations, in order to meet satisfactory conditions of the soil-foundation system in terms of ultimate limit states (ELU) and service (ELS). In general, load transfer methods are numerical methods widely used to estimate load-settlement curves of single piles or pile groups. In this way, the present research presents proposals for the prediction of load transfer curves on single piles and on groups executed in granular soil profiles from hyperbolic functions. For that, 22 experimental studies were collected, totaling 59 single piles and 25 pile groups, evaluating the adherence of the t-z and q-z load transfer curves to hyperbolic functions. It is also proposed values for the deformation parametersMof single piles and pile groups. In addition, predictions of t-z and q-z hyperbolic curve parameters were evaluated from correlations with field test measurements, pile geometry and initial subsoil stresses, as well as predictions of pile group behavior from the behavior of the respective single piles. In general, it is concluded that the load transfer curves are convergent to hyperbolic functions. The prediction of deformation parameters M on single piles showed to be convergent and numerically superior to the values proposed by Bohn, Santos, and Frank (2016). For piles on groups, reference values of the parameter M were preliminarily proposed. As for the prediction proposals of the hyperbolic t-z and q-z curves from the NSPT of standard penetration tests (SPT) and qc and fs of the cone penetration test (CPT), convergence was observed only in the analyzes for single piles. For piles on groups, the predictions of the t-z and q-z curves were more convergent in the prediction proposal based on correlations with the parameters of the single piles.