Banca de DEFESA: Saul Oliveira da Silva

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Saul Oliveira da Silva
DATE: 05/07/2024
TIME: 09:00
LOCAL: Sala Teams (On-line)
TITLE:

"NUMERICAL SIMULATION OF THE COLLAPSE INDUCED BY FLOODING AND LOADING OF RAFTS WITH AND WITHOUT RIGID INCLUSIONS"

KEY WORDS:

Numerical simulation; Collapsible soils; Rigid inclusions; Constitutive models; Undergound flooding.

PAGES: 94
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Geotécnica
SUMMARY:

Among the objects of study in unsaturated soil mechanics, there are materials that suffer considerable volume reduction when exposed to increased moisture content, even without the addition of external stresses. These soils are known as collapsible soils, and for this type of soil, the use of a rigid inclusions system is proposed as a foundation solution. However, analyzing the collapse phenomenon to understand the behavior of foundations reinforced with rigid inclusions is relatively complex, as it involves transient flow and the specific peculiarities of this type of foundation. Additionally, it requires a mechanical approach pertinent to unsaturated soils, considering suction and other related parameters, thus necessitating the use of numerical models. This study aims to perform the numerical simulation of two raft foundations subjected to soil collapse induced by flooding and loading, using appropriate constitutive models for such analysis, to verify both the capacity of the reinforcement with rigid inclusions to reduce the consequences of soil collapse and to validate the models used. In this research, a coupled flow-deformation analysis was developed using the Finite Element Method (software Plaxis 2D and 3D), utilizing unimodal and bimodal water retention curves (obtained by the models of Cavalcante & Zornberg (2017) and Costa & Cavalcante (2021), respectively), as well as the Barcelona Basic Model constitutive model to simulate the collapse. After comparing the numerical analysis results with those obtained by Santos Neta (in press) in physical simulation, it was observed that the models used were able to appropriately reproduce the flooding process performed, as well as the subsoil collapse itself, obtaining results consistent with those verified in the field. Additionally, the effectiveness of the rigid inclusion system in reducing displacements suffered by the raft foundation was also proven in comparison with the same foundation without reinforcement under the same conditions.

COMMITTEE MEMBERS:
Externo à Instituição - Gilson de Farias Neves Gitirana Júnior - UFG
Externo ao Programa - 1293542 - JOSE WILSON DOS SANTOS FERREIRA - nullPresidente - 2161425 - JUAN FELIX RODRIGUEZ REBOLLEDO
Interno - 1549489 - MANOEL PORFIRIO CORDAO NETO