Geotechnical study in Quatretonda

In Quatretonda, carbonate materials such as limestones, dolomites and marbles predominate, which represent more than 68% of the geological substrate. These soils generally show good bearing capacities for shallow (direct) foundations, although in localised areas fine sandstones, silts and the occasional presence of gypsum, anhydrite and salts have also been identified. These materials may be affected by dissolution processes and therefore require special analysis to avoid problems of instability or differential settlement. The groundwater table may be shallow in certain areas, making adequate hydrogeological characterisation essential before defining the foundation type.

Seismicity in the area is rated as very low, with only six events over 30 years and a maximum magnitude of 3.6, so it does not represent a significant concern for structural design. However, the possible existence of karstification in the carbonate materials requires thorough verification of cavities or ground subsidence prior to proceeding with foundation construction, since it is the main geotechnical factor for the safety of buildings in the municipality. In addition, the non-clayey substrate eliminates the risk of expansivity.