Avaliação da relação entre comportamentos mecânico e hidráulico para lastro ferroviário

Abstract

The performance of the rail ballast layer is dependent on the physical, mechanical and hydraulic characteris7cs as well as the characteris7cs of other components such as ve-hicle and track speed. This study aims to evaluate ballast materials, in various applica-7on phases, regarding mechanical and hydraulic behavior. For this purpose, tradi7onal aggregate shape tests, advanced aggregate shape proper7es tests were performed us-ing digital image processing, resilience modulus, permanent deforma7on and hydraulic conduc7vity. The results showed that greater permanent axial deforma7on does not necessarily imply lower hydraulic conduc7vity for the materials evaluated in this study. The mechanical behavior was changed from the changes in the shape proper7es of the aggregates (2D shape and texture), as well as the par7cle size. The hydraulic conduc7vity remained the same for the three materials evaluated, even aMer the mechanical tests. Overall, the three materials were considered prone to breakage, but although they went through construc7on and opera7on, they were all classified as clean.