Geotechnical study in Castelló

In the municipality of Castelló, formations of limestones, dolomites and marbles predominate, followed in frequency by sandstones, conglomerates and flysch, while gypsum, anhydrite and salts appear occasionally. This substrate, characterised by low permeability at the surface and the possible presence of aquifers at greater depth, provides favourable mechanical conditions for direct foundation in most cases. However, in areas with gypsum and salts there is a significant risk of dissolution, which may affect the stability of foundations and requires specific analysis before carrying out any work, avoiding these materials as a preferred bearing level.

Seismic activity in Castelló is high, with more than 150 events over 30 years and a maximum recorded magnitude of 4.7, so seismic risk must be addressed in structural design. In addition, the presence of calcareous substrates implies the possibility of karst developments, so it is essential to verify the existence of underground cavities before founding. Since the substrate is not clayey, the risk from expansive soils is largely ruled out. The main geotechnical factor in Castelló is therefore the possible presence of karst and gypsum-bearing areas, together with the seismic consideration.