Geotechnical study in Castellbisbal

In Castellbisbal, formations of sandstones, conglomerates and flysch predominate, accounting for close to 69% of the soils present, generally offering good mechanical behaviour and high bearing capacity for shallow or semi-deep foundations. Although there are isolated areas with fine sands, silts, slates, schists and small proportions of hard clays and marls, the latter having low deformability, the dominant substrate tends to be stable and of low compressibility, which is favourable for foundations. Permeability is low at the surface, although there may be deep aquifers of some importance.

Seismicity is very low, with only 3 events recorded over 30 years and a maximum magnitude of 2.8, so it does not represent a relevant constraint for structural design. However, since the municipality has a risk of karstification, it is essential to verify the possible presence of cavities or dissolved conduits in the substrate before constructing the foundation, as this can significantly affect the stability of the structure and the choice of foundation type. The main aspect to control in Castellbisbal is the possible impact of karst phenomena.