Geotechnical study in Purullena

In Purullena, fine sands and silts predominate, followed by gravels and compact sands, while limestones, dolomites and marbles crop up occasionally. These materials generally offer favourable bearing capacity for shallow foundations, although the dominant presence of granular materials means that attention must be paid to density and possible areas of loose soil during geotechnical investigation works. The local aquifers, which are very extensive and productive, can affect the calculation of the groundwater level and condition the design of the associated foundation systems and drainage arrangements.

The seismicity recorded in Purullena is very low, with only two events in 30 years and a very low maximum magnitude (2.1), so seismic risk is not a constraint for local structural design. The absence of an clayey bedrock rules out problems related to expansivity, and there is also no risk of karstification in the area. Therefore, the main aspect to consider in the geotechnical study will be granulometric heterogeneity and the presence of aquifer levels, which are decisive for selecting the most suitable foundation type.