Estudio geotécnico in Arroyo del Ojanco

The municipality of Arroyo del Ojanco is notable for the significant presence of gypsum, anhydrite and salts, which occupy more than 30% of the subsoil and constitute a critical factor due to their potential for dissolution, which may adversely affect the stability of foundations. Alternations with limestones, dolomites and marbles increase the likelihood of karstified zones, so it is essential to carry out a thorough inspection of the ground before defining the foundation type, given the risk of voids or collapse. Granular materials such as compacted gravels and sands, although present in smaller proportions, can provide good bearing conditions if they are located, whereas the presence of white expansive clays is sporadic and generally does not determine the overall behaviour of the ground.

As regards seismicity, Arroyo del Ojanco shows very low levels with a maximum magnitude that is low, so this aspect will not be conditioning in structural calculations. However, the existence of karstified formations requires verifying the presence of caves or dissolved conduits before undertaking any foundation, this being the main geotechnical constraint in the area. The predominant non-clayey substrate rules out the risk of expansivity, simplifying the selection of support solutions provided that the stability associated with gypsum and karstified zones is properly checked through the geotechnical study.