Geotechnical study in Treviño County

In the Condado de Treviño, the subsoil is mainly composed of limestones, dolomites and marbles, with a significant presence of sandstones, conglomerates and flysch. These materials generally provide a good bearing capacity for shallow and deep foundations, although the fine sandstones and silts must be analysed locally, as they may exhibit less suitable behaviour. Given the abundance of carbonate formations, the accurate characterisation of the level and continuity of the substrate is crucial in order to establish optimum foundation solutions, as well as to detect any possible cavities or dissolution processes.

Seismic activity in the municipality is notable, with 76 recorded events over 30 years (Mmax 4), which requires accounting for seismic action in structural design. The presence of karstification must be rigorously verified before founding, since limestones and dolomites can generate underground voids that affect the stability of the foundations. The non-clayey substrate rules out the risk of expansivity; however, the main geotechnical constraint is determined by the potential existence of karstic cavities and the need to consider seismicity in structural projects.