Geotechnical study in Arboleas

In Arboleas, fine sands and silts predominate; they occur in almost half of the territory and usually offer a medium bearing capacity, accompanied by slates, schists, and occasionally limestones, dolomites and marbles. This lithological range requires a detailed analysis of its compactness and particle-size distribution before designing the foundation, since the presence of soft sandy horizons or silts may necessitate specific solutions to control deformability. In addition, the isolated occurrence of gypsum, anhydrite and salts implies considering the risk of dissolution, while isolated groundwater aquifers require assessing their possible influence on ground stability.

The seismicity of the area, with 50 events in the last 30 years and a maximum magnitude of 3.9, can be classified as moderate and does not constitute a prominent structural constraint, although any foundation must consider these dynamic actions in the analysis. Given the presence of carbonate materials (limestones, dolomites, marbles) and the reference to karst, it is essential to verify the existence of voids and subsidence before carrying out any type of foundation. The non-clayey substrate rules out the risk of expansive movements, so the main factor to consider is the possible presence of karst processes that may affect the safety of the foundation directly and significantly.