Analysis of the Influence of Moisture Variation on the Behavior of Tropical Soils of Carajás Railway

The criteria for selecting materials railway pavement (particle size distribution, California Support Index, and physical indexes) are not suitable evaluating the hydraulic behavior of tropical soils under unsaturated conditions, often resulting in rejection with good mechanical performance. trackbed is exposed to precipitation, allowing water infiltration into layers consequently leading moisture variation. Therefore, present study aims assess variation over time when subjected action rainfall. For this purpose, five were analyzed as constituent subballast, infrastructure Carajás Railway Brazil being used a reference. Water retention curves conductivity tests conducted using HYPROP (Hydraulic Property Analyzer) WP4-C (Water Potential Four) equipment, numerical modeling was developed IVFlow software. revealed that sample 1 (lateritic sand) performed better compared other soils, it exhibited lower (3.25% above optimum content) influence rainfall also had low permeability.