Estudio geotécnico in Agoncillo

In Agoncillo, the ground is dominated by sandstones, conglomerates and flysch formations—materials that provide a solid, stable foundation for construction. Alongside these, in a smaller proportion, there are compact gravels and sands, which offer good bearing capacity and favourable conditions for shallow foundations, provided their degree of compaction is verified. Although there is a minor presence of gypsum, anhydrite and salts, these may pose a risk of dissolution on contact with water, so their exact location must be determined before selecting the foundation point. The existence of extensive, highly productive aquifers requires a thorough assessment of the groundwater level before developing any foundation project.

From the geotechnical standpoint, the seismicity in Agoncillo is high, with up to 200 recorded events over 30 years, although its maximum magnitude does not exceed M4. Accordingly, the seismic effect on the designed structures must be taken into account in the structural analysis, adjusting the design criteria to the current regulations. Since the bedrock is not clayey, there is no risk of significant expansivity that could compromise the foundation. The main conditioning factor in Agoncillo is the confluence between the possible dissolution of gypsum, although limited in extent, and the presence of aquifers, which calls for detailed in situ studies to ensure the feasibility of the proposed construction solutions.