Geotechnical study in Ormaiztegi

In Ormaiztegi, the predominant geotechnical substrate is formed by limestones, dolomites and marbles, materials that account for more than 86% of the soils in the municipality. These rock types provide a solid foundation with good bearing capacity, which is favourable for most solutions for shallow and deep foundations. The occasional presence of fine sands and silts may require specific checks on compaction in particular areas, although, in general, they do not significantly compromise the foundation stability.

Seismicity in Ormaiztegi is very low, with only 2 recorded events over 30 years and a maximum magnitude of 1.5, which implies a practically negligible seismic risk for structural design. As regards expansivity, although expansive clays may appear in a subordinate manner, they are laid out in climatic zones without anhydrous deficit, so the associated risk is limited. The main factor governing the municipality is the compact carbonate formations, which favour stability, whereas monitoring of isolated sands and silts may be advisable where they are found.