Estudio geotécnico in Zigoitia

In Zigoitia, carbonate substrates of limestone, dolomite and marble predominate, accompanied by sandstone, conglomerates and flysch, whereas fine sands and silts are only occasional. These materials generally offer favourable bearing capacity for foundations, although their low permeability may lead to localised superficial aquifers. It will be essential to analyse the homogeneity of the calcareous materials, as they may show discontinuities or fragile zones, particularly at the contact with looser or silty layers, in order to select the optimal foundation type.

Seismicity in Zigoitia is very low, with a maximum of one minor event every 30 years (Mmax 1.5), so seismic risk does not represent a design constraint in the geotechnical study. Nevertheless, particular attention should be paid to the possible development of karst in the carbonate formations, since the presence of cavities or dissolution may compromise the stability of the foundations; verification is recommended prior to construction. In addition, the non-clayey substrate rules out expansivity-related risks, with detailed recognition of the possible karstification identified as the main constraint.