Banca de DEFESA: PALOMA COLMANA MARTINS DE FIGUEIREDO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PALOMA COLMANA MARTINS DE FIGUEIREDO
DATE: 19/10/2020
TIME: 14:00
LOCAL: Videoconferência pelo link https://meet.google.com/sni-svos-jau
TITLE:

THE INFLUENCE OF VERTICAL SPACING BETWEEN REINFORCEMENT LAYERS ON THE GEOSYNTHETIC REINFORCED SOIL DISPLACEMENT OF BRIDGE-SUPPORTING WALLS

KEY WORDS:

Bridge-supporting wall, lateral displacement, settlement, vertical spacing, numerical simulation.

PAGES: 93
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Geotécnica
SUMMARY:

The Geosynthetic Reinforced Soil (GRS) bridge-supporting walls are structures in which the bridge abutment is supported directly by the reinforced fill, allowing the reinforced soil structure to function both as a retaining element and a foundation one. The advantages associated to the use of retaining walls includes cost reduction, rapid construction, capability of supporting differential settlements and good seismic performance. However, due to being a fairly recent method, there are scarce studies published regarding this topic. Especially in relation to the effect of vertical spacing between reinforcements layers, considering a constant ratio of geosynthetic stiffness (J) to the vertical spacing (Sv). This research investigated using numerical simulations the influence of the vertical spacing between geosynthetic layers on the reinforced soil mass performance for the same J/Sv ratio. Small values of vertical spacing were assumed, according to the typically used distances in GRS bridge-supporting walls. The finite element method computer software PLAXIS 2D (2016 version) was used to perform the numerical simulation. The validation of the numerical model was made using results of laboratory tests performed at The University of Texas at Austin, USA. The tests were conducted using a rigid box of large dimensions, in which the frontal wall allowed lateral movements. Thereby, it was possible to simulate displacements from the frontal side of the real retaining structure at the bridge abutment in the field. The numerical simulations used to parametric analysis were performed by variating the vertical spacing, the reinforcement stiffness, the height and the length of the reinforced soil. The results indicated that the increase in the stiffness and decrease in the vertical spacing of the geosynthetic layers led to smaller lateral displacements and smaller settlements. Nevertheless, the decrease in the vertical spacing was perceived as a more significant aspect than the reinforcement stiffness. To smaller values of the J/Sv ratio, the modifications of the vertical spacing caused different displacements however, to larger values of that same ratio, changes were not noticeable.

BANKING MEMBERS:
Externo à Instituição - ANA PATRICIA NUNES BANDEIRA
Presidente - 1524077 - CARINA MAIA LINS COSTA
Externa ao Programa - 649.358.842-15 - LUCIANE MARCELA FILIZOLA DE OLIVEIRA - UEL
Interno - 2551234 - YURI DANIEL JATOBA COSTA