Geotechnical study in Colunga

In the municipality of Colunga, the dominant subsoil is mainly made up of low-permeability materials such as slates and schists, which provide generally homogeneous and sufficient bearing capacity for conventional foundations, except in specific areas where clays and peats of deltaic origin are frequent. Although these are uncommon, they exhibit low strength and high deformability, meaning they should be avoided as a support level for foundations due to their potential for differential settlement.

Seismic activity in Colunga can be considered high, as it records around 200 events over 30 years, although the maximum magnitude observed (Mmax 4.2) does not exceed the thresholds of greater structural relevance; however, it does justify considering seismic risk in the design. Given the non-clayey nature of the subsoil, the risk of expansiveness is ruled out. It is important to note the possible presence of karst in the area, which requires specific checks to ensure the suitability of the ground before proceeding with foundation works, constituting the main local geotechnical constraint.