1,721,107 research outputs found
Overview of Line 6 of the Underground in the city of Napoli
No full textThe presentation was aimed to provide an overview of the main design issued to be faced when dealing with huge underground works in a densely urbanized area to extend the transportation network in the city of Napol
Experimental investigations and analysis on different pile loadtesting procedures
No full textThe paper presents experimental results of two
Osterberg’s cell load tests (OLTs) and three conventional
load tests (COLTs) in the same subsoil conditions on
Continuous Flight Auger (CFA) piles carefully monitored
during construction stages. The instrumentation along the
pile shaft in all the tests allows interesting comparisons of
both global behaviour and local load transfer. Significant
differences in the stiffness of the soil-pile system with the
different test procedures is outlined.The main differences
between the two test procedures occur at the two opposite
ends of the pile, as could have been expected, while the
observed behaviour in the middle part of the tested piles is
close for the two models. A relatively simple FEM model
has been calibrated on the basis of the OLTs results. The
same model is capable of accurately matching the experimental
results of the COLTs, proving that the observed
differences are not due to random factors. Furthermore, the
same model has been used to simulate ideal load tests.
Such a reliable simulation shows that both the experimental
procedures are actually responsible for significant differences
in the behaviour of the soil-pile system even in the
simple case of a concentrated axial load. Large differences
arise in terms of the stiffness of the system with the OLTs
providing by far the stiffest response. Despite being intermediate
between the OLT and the ILT, the COLTs provide
a response of the pile-soil system, which is on the average
about two times stiffer than the Ideal test, where the force
applied on top of the pile does not depend on a tangible
reaction system. Care should be thus taken when considering
the results of such tests in the prediction of the
settlement of a piled foundation. Correction factors should
be applied to the experimentally observed behaviour
Master Emerging Technologies for Construction - Master di II livello dell'Università Federico II di Napoli
No full textConvenzione per la consulenza e la supervisione alle attività di monitoraggio della costruenda Linea 6 della Metropolitana di Napoli
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Master Emerging Technologies for Construction - Master II livello dell'Università Federico II di Napoli
No full textConsulenza per la supervisione alle attività di monitoraggio della costruenda Linea 6 della Metropolitana di Napoli
No full textConvenzione per consulenza relativa ai problemi di venute d'acqua nella stazione di Poggioreale
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Convenzione per consulenza e supervisione relativamente alle attività di monitoraggio della costruenda Linea 6 della Metropolitana di Napoli
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