Geotechnical study in Castro del Río

In Castro del Río, the geological substrate is dominated by limestones, dolomites and marbles, which provides a competent base with good bearing capacity for foundations. These carbonate materials, although solid, may present internal cavities and voids associated with the possible presence of karstification. In smaller areas, sandstones and conglomerates are found, as well as deposits of fine sands and silts, which generally require careful assessment of their compactness and bearing capacity in the event of shallow foundations.

Seismic activity in the municipality is moderate, with a record of 10 events over 30 years and magnitudes below 4.5, so the seismic factor has relative importance in structural design. The presence of karst is a key aspect to consider before any type of foundation, as there are potential risks of voids and subsidence associated with the dissolution of the carbonate formations. Since the substrate does not contain expansive clays, the risk of expansivity is ruled out and the main geotechnical constraint is the verification and characterisation of the karst in the ground.