Estudio geotécnico in Irixo, O

In the municipality of O Irixo, the dominant bedrock is mainly composed of sandstones, conglomerates and flysch, accounting for more than half of the surface area, accompanied by a significant presence of slates and schists. These materials, mostly of low permeability, generally offer good stability conditions for shallow and intermediate foundations, providing adequate bearing capacity and a low risk of differential settlement, although surface water may collect in specific points. The structural behaviour of the slates and schists requires an assessment oriented to the orientation of joints and foliations, typically providing sufficient support for standard works.

The recorded seismic activity in O Irixo is moderate, with 13 events over 30 years and a low maximum magnitude (Mmax 2.5), which implies that seismicity is not a relevant constraint for geotechnical design in the area. The non-clayey bedrock rules out the presence of expansive soils, which minimises risks linked to volumetric changes in the surface layers. In this way, the main aspect to control will be the local heterogeneity of the materials and the possible discontinuities within the formations present.