Geotechnical study in Cedeira

In Cedeira, the dominant subsoil consists of slates and schists, although their presence is occasional, which influences the bearing capacity of the ground. These rock formations, usually impermeable or with very low permeability, limit water infiltration and may form shallow aquifers of limited extent. For building or infrastructure projects, it is essential to analyse the thickness and continuity of these materials, whose consolidation typically allows for shallow foundation solutions when the thicknesses are sufficient and the areas do not show altered materials.

Seismicity in Cedeira is very low, with a single recorded event in the last 30 years and a maximum magnitude of 2.7, which implies that seismic hazard is negligible for structural design. Moreover, since the subsoil is not clayey, the risk of expansivity is ruled out, and the absence of karst phenomena allows the main constraint to be focused on characterising the low permeability of the materials and the localised identification of altered zones. A geotechnical study in Cedeira should particularly focus on identifying these layers and on the detailed assessment of the bearing capacity of ground with possible alteration.