Geotechnical study in Villamartín

In Villamartín, sandstones, conglomerates and flysch materials predominate as the main geological formation, representing more than 60% of the local substrate. These soils generally provide a good bearing capacity, allowing shallow foundations in most interventions, although it is essential to assess the consistency and degree of weathering of the flysch in each specific case. Carbonate lithologies (limestones, dolomites and marbles) occur only in isolated patches and, although less frequent, can influence the choice of foundation system if the project coincides with these areas. Loose materials such as sands and silts are rare and, when encountered scattered, only pose a localised conditioning factor in excavations or specific zones.

Seismic activity in Villamartín is notable, with 67 recorded events over 30 years and a maximum magnitude of less than 4, which suggests that the seismic response should be verified for singular works, even though it does not represent a critical factor in standard design. It is relevant to highlight the presence of karst-related phenomena due to the carbonate occupations; before founding, it is essential to check for cavities or dissolution, given the potential structural risk they entail. Owing to the non-clayey nature of the substrate, the issue of expansivity is ruled out in the analysed soils. The main geotechnical constraint in Villamartín is determined by the potential presence of karst, imposing the need for specific studies to rule out subsidence or associated instabilities.