Comportamento de solos estabilizados quimicamente e reforçados com fibras sob ações monotónicas e cíclicas

This work analyzes the behavior of chemically stabilized soils unreinforced and reinforced with steel and polypropylene fibers. Initially, the behavior under monotonic compressive and tensile loads is addressed, using as reference the soft soil of Baixo Mondego. Subsequently, the effect of cyclic loading on the behavior of a sand, a silt and an organic soil is analyzed. This is based on the comparison of the results of monotonic unconfined compressive strength (UCS) and Brazilian tests with equivalent tests previously subjected to cyclic loading. Additionally, the accumulated permanent deformations obtained in the cyclic phase are also analyzed. From the results it was found that: i) the reinforcement with both types of fibers increases the ductility of the stabilized soil; ii) the effect of the inclusion of fibers on the mechanical properties depends on the cementation level, i.e., for low binder content the inclusion of fibers has a positive effect, while for high binder content the effect is negative; iii) regardless of the soil type, the cyclic loading induces the increase of the mechanical properties of the stabilized soils.