Banca de DEFESA: Josiene Chrystina Ribeiro Cardoso

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Josiene Chrystina Ribeiro Cardoso
DATE: 16/09/2024
TIME: 14:00
LOCAL: Online (Sala-Virtual)
TITLE:

Analysis of the Influence of Moisture Content on the Mechanical Behavior of Subgrade Soils in Road Pavements in the Federal District and the State of Roraima.

KEY WORDS:

Unsaturated Soils, Matric Suction, Resilient Modulus, Permanent Deformation.

PAGES: 209
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Geotécnica
SPECIALTY: Pavimentos
SUMMARY:

Geotechnical structures in road pavements are composed of granular materials that exhibit variations in both their microstructure and macrostructure. These materials are sensitive to moisture variation, which directly affects their load-bearing capacity. Therefore, it is essential to ensure that the granular layers remain in an unsaturated condition to guarantee good mechanical performance. However, subgrade soils are subject to moisture content variations due to weathering processes, which are influenced by climatic, geomorphological, and hydrogeological factors. These changes significantly affect the mechanical properties of soils, such as stress-strain relationships and shear strength. This study aims to investigate how variations in moisture content and suction impact the mechanical behavior of two types of subgrade soils from the Federal District and one from the state of Roraima. Using dynamic triaxial tests, the resilient modulus and permanent deformation of the soils were measured under different moisture conditions and suction levels. The research evaluates how these factors influence the deformability properties of the soils, providing a detailed analysis of each material's behavior. The laboratory results allowed for the microstructural and macrostructural characterization of the grains, as well as revealing the suction behavior of the tested soils. The stress-strain tests conducted in the dynamic triaxial apparatus showed a significant influence of saturation and suction on the performance of plastic and elastic deformations, highlighting the importance of compaction at the "optimum" moisture content and maintaining this level throughout the pavement’s service life. Thus, this study provides a deeper understanding of the effects of moisture and suction on soil behavior, offering insights for a better comprehension of the conditions that affect the performance of pavement materials. This contribution is crucial for the development of more effective solutions in pavement design, ensuring greater durability and resistance to environmental variations.

COMMITTEE MEMBERS:
Externo à Instituição - MAGNOS BARONI - UFSM
Interno - 1549489 - MANOEL PORFIRIO CORDAO NETO
Interno - 404227 - MARCIO MUNIZ DE FARIAS
Presidente - 3132829 - RAFAEL CERQUEIRA SILVA