Análise do potencial de colapso de um solo argiloso do município de Apucarana – PR

Abstract

The conception of a mental map about the soils of the Apucarana-PR region is still deficiente due to the lack of research in this regard. The innumerable characteristics inherent to soils, a phenomenon of possible occurrence in the study region is noteworthy: the collapsibility of the soil structure, since it is known of the high porosity of the soil type present in this region. Thus, this work aims to present, at an early stage, a basic characterization of some samples of soils from Apucarana and an analysis of an undisturbed example of a specific soil, to verify the collapsibility potential, with incremental soaking stages, in simple edometric test, supporting studies about their mechanical behavior. For this purpose, deformed and one undeformed sample were collected in different parts of the city and tests were performed, according to Brazilian and international standards, to determine the physical indexes and consistency limits and their collapsibility potential was verified by application of criteria based on physical and laboratory indexes. The results confirm the existence of highly porous clay soils with some plasticity in the Apucarana region. Collapsibility studies, through the application of theoretical criteria, show insufficient results to prove the existence of collapsible material in three studied points. In a more in-depth study from simple flood edometric tests, the results showed that a red Nitosol exhibited collapsible behavior of moderate gravity at a soaking stress of 207.10 kPa. As soakings stress increased, the collapse potential presented a growth to a peak and after, decreased to stabilize.