Estudio geotécnico in Castellterçol

In Castellterçol, the predominant composition of the subsoil corresponds to sandstones, conglomerates and flysch, reaching a frequency of 93.75%, while white or soft expansive clays occur only occasionally. These formations, which are generally of low or very low permeability, limit infiltration and are usually poorly suited to host deep aquifers, although shallow aquifers may exist in certain areas. The geomechanical characteristics of these materials provide, apart from specific exceptions, an adequate bearing capacity for typical shallow foundations, provided that the density and condition of the conglomerates and sandstones are verified. It is essential to avoid placing foundations on levels where soft clays are present.

Seismic activity in Castellterçol is very low, with only 5 events in 30 years and a maximum magnitude (Mmax) of 1.6, which implies a very low seismic risk that generally does not influence conventional structural design. There are no risks associated with karstification in the area, and, since a non-clayey substratum predominates, the risk of expansivity is ruled out, thus allowing a simplified geotechnical approach. The main constraint in Castellterçol is lithological heterogeneity, so accurate characterisation at the foundation point should be the priority of the geotechnical study.