Geotechnical study in Granada

In Granada, fine sands and silts predominate, accompanied in smaller proportions by expansive clays, overconsolidated marls, deltaic silts and localised levels of gypsum, anhydrite and salts. The widespread presence of sandy and silty materials generally provides favourable bearing capacity, although in areas where deltaic silts or peats occur, these strata should not be used as a support level, given their low mechanical performance. Gypsum and salts require attention due to their potential for dissolution, which could affect the stability of the foundation.

The region exhibits high seismic activity, with around 200 recorded events over 30 years, although its maximum magnitude (Mmax 3.8) does not reach levels critical for structural design. The risk of soil expansivity is negligible, as an underlying predominantly non-clayey substrate is confirmed. Nevertheless, the possible presence of karst makes it essential to check for cavities before carrying out the foundation, with this factor being established as the main technical constraint in geotechnical studies in Granada.