Banca de DEFESA: Andrea Juliana Alarcon Posse

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : Andrea Juliana Alarcon Posse
DATE: 12/08/2022
TIME: 10:00
LOCAL: TEAMS
TITLE:

BEHAVIOR OF PILED RAFT SYSTEMS FOUNDED IN SOFT CONSOLIDATING SOILS
VIA NUMERICAL METHODOLOGIES

KEY WORDS:

Key Words: Piled Raft, Numerical analysis, Hardening Soil Model, Regional Subsidence,
Centrifuge modeling

PAGES: 191
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Geotécnica
SPECIALTY: Fundações e Escavações
SUMMARY:

In this work, a 3D numerical model was developed in a software based on the Finite
Element Method, using the results obtained in a geotechnical centrifuge model of a
piled raft system founded on soil subjected to regional subsidence. The numerical model

was calibrated for an initial configuration of 9 piles distributed in the center of the raft.
Soil parameters were obtained, calibrated and validated for the Hardening Soil Model
based on laboratory results of triaxial and consolidation tests. In addition, other
laboratory tests were carried out in a centrifuge that allowed obtaining the resistance
parameters of the foundation studied.
The developed numerical model reproduced satisfactorily soil and foundation
consolidation displacements due, not only by the structural service load but also by the
pore pressure drawdown. For load distribution on piles and raft, the model reproduces
with good agreement the foundation behavior only for the structural service load, for
pore pressure drawdown some adjustments on the embedded piles elements shaft and
base resistance had to be done. The developed model allowed to identify the most
sensitive parameters for this type of simulation, to define the types and stages of
analysis that had the best fit for the physical model, and to obtain additional results to
those measured in the physical model, e.g., the axial load distribution developed along
the piles and therefore the magnitude of the negative skin friction, that is an important
load that should be considered for the structural safety review of piled foundations
subjected to this complex conditions.
This model was used to carry out a parametric analysis that allowed evaluating the
influence of geometric characteristics such as the spacing, length and slenderness of the
piles in the piled raft systems. With the assessment of these results, some correlations
are presented to estimate the negative friction from these characteristics.

BANKING MEMBERS:
Presidente - 1122864 - RENATO PINTO DA CUNHA
Interno - 1549489 - MANOEL PORFIRIO CORDAO NETO
Externo à Instituição - GABRIEL AUVINET GUICHARD
Externo à Instituição - JUAN CARLOS RUGE CARDENAS