Banca de DEFESA: Renato Santos Paulinelli Raposo

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : Renato Santos Paulinelli Raposo
DATE: 13/07/2022
TIME: 14:00
LOCAL: TEAMS
TITLE:

FLUENCE IN ROCKFILL IN DAM AND INFLUENCE OF CONSTRUCTIVE DELAY OF THE CONCRETE FACE

KEY WORDS:

1. Dams

2. Simulation

3. Fluency

4. Rockfill

PAGES: 202
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Geotécnica
SPECIALTY: Obras de Terra e Enrocamento
SUMMARY:

The advances in equipment and tools implemented for geotechnical engineering are allowing
projects to be supported by numerical simulations. However, even with sophisticated resources,
the industry still lacks little information on laboratory parameters as in the case of Concrete
Face Rockfill Dams (CFRD). In this sense, the present thesis becomes another academic
provocation to stimulate the use of backanalysis of real BEFC works to search for simplified
models that can be applied in the industry. The objectives include the simplification of the
behaviour for linear modules associated with a coefficient representing the physical
characteristics of settlements in time and due to reservoir flow. The calibrated model allows
three-dimensional extrapolation for the evaluation of stresses and displacements in the concrete
slab at different construction delays. Among several topics, the text goes through examples of
real BEFC simulations and cites some constitutive models of collapse and flow in geotechnics.
The model for calibration of the BEFC includes elegant adaptation of the heat flux as a
representation artifice of the vertical orthotropic collapse of the rockfill. For calibration, 16
constitutive models were tested, nine of them got well-fit results both in the constructive phase
and during backfilling, compared to read displacement of BEFC. After collecting the results,
the parameter pairs were plotted in point cloud in search of patterns for the calibrations. Further,
six different slab constructive delay sequencing arrangements were simulated. The study uses
a numerical artifice that enables the activation of the concrete slab in its correct design
thickness. Among the results of stresses, the step-by-step sequencing of the slab following the
rockfill reached the worst horizontal stresses, which reach up to 48 MPa, which exceeds the
typical compressive strengths of conventional concrete and becomes a point of attention
regarding the structural integrity of the slab. The results suggest that step-by-step sequencing
should be avoided and a balance between behavior could be achieved in a scenario of delay
sequencing of the slab concreting of at least half the height of the dam with initial backfill. It is
important to portray that all the considerations in the thesis are for a specific example. Any
generalization should be avoided or be associated with larger complementary studies, because
each dam is a unique project and should be studied individually, on a case by case basis.

BANKING MEMBERS:
Externo à Instituição - CARLOS ALBERTO LAURO VARGAS - UFG
Externo à Instituição - ADRIANO FRUTUOSO DA SILVA - UFRR
Presidente - 404827 - ANDRE PACHECO DE ASSIS
Interno - 1549489 - MANOEL PORFIRIO CORDAO NETO