Geotechnical study in Fuentidueña de Tajo

In Fuentidueña de Tajo, the subsoil is characterised mainly by the presence of gypsum, anhydrite and salts, accompanied by extensive bodies of groundwater. These lithologies provide high permeability, facilitating the circulation of water at depth, which must be carefully assessed in foundation projects due to the risk of dissolution of the gypsum-bearing materials, which may lead to instability or subsidence. The secondary presence of schists and residual voids with limestones points to the possibility of alternating hard and competent soils with others that are more soluble, so the bearing capacity may show some heterogeneity over short distances.

Seismic activity in the area is very low, with only 6 events over 30 years and a maximum magnitude of 2.6, so it does not constitute a significant constraint for structural design. Nevertheless, since the area has potential for karstification, it is essential to verify this condition thoroughly before carrying out any foundations, as the existence of cavities or dissolution may affect both the stability and the durability of the structures. The non-clayey substratum eliminates concern about expansivity. The main factor to consider in the geotechnical studies of Fuentidueña de Tajo is the presence of soluble materials and the possible evolution of karst-related phenomena.