Estudio geotécnico in Arrigorriaga

In Arrigorriaga, sandstone, conglomerate and flysch strata predominate; these account for more than half of the territory and provide a competent foundation for footings, thanks to their density and strength. Limestones, dolomites and marbles also contribute good mechanical behaviour, although they must be studied locally due to their potential fracturing. The secondary presence of fine sands and silts may indicate areas of lower bearing capacity and greater deformation under load; therefore, specific analyses are required to determine their suitability as a support level.

The municipality shows notable seismicity, with 94 events over the last three decades and a maximum magnitude of 3.7; this level calls for the integration of anti-seismic requirements in structural design. There is no evidence of karstification in the area and, since the dominant substrate is not clayey, the risk of expansivity is ruled out. The reduced permeability of the materials requires particular attention to water management during and after foundation works, configuring density and the possible presence of loose ground as the main geotechnical constraint in the municipality.