Estudio geotécnico in Irun

In the municipality of Irun, granitic materials, gneiss and other igneous rocks predominate as the substrate, accounting for more than 30% of the ground, followed by sandstones, conglomerates and flysch. These rock formations have high strength and stability, which favours an excellent bearing capacity for shallow, direct foundations, particularly in medium- and large-scale projects. Limestones, dolomites and marbles occur occasionally and may influence localised areas, but in general the dominant presence of compact igneous and sedimentary rocks makes it possible to propose conventional, shallow foundation solutions, minimising the risk of differential settlement. It is important to note that the low frequency of gravels, compact sands, fine sands and silts limits the occurrence of compressible or problematic soils for founding.

The seismicity in Irun is very low, with only 9 recorded events over 30 years and a maximum magnitude below 3.5, so seismic action does not represent a significant design constraint for structural engineering. In addition, the largely non-clayey substrate rules out the risk of expansive soils that could affect the stability of structures. There are no signs of karst development or any significant presence of soluble materials that could induce dissolution-related problems. In conclusion, the high competence of the rock mass is the main geotechnical factor to consider for new construction projects in Irun.