Estudio geotécnico in Calvarrasa de Abajo

In Calvarrasa de Abajo sandstones, conglomerates and flysch predominate, accompanied in similar proportions by compact gravels and sands, providing a solid and competent subsoil for most foundations. The occasional presence of fine sands and silts indicates sectors with lower compactness, where the bearing capacity could be reduced and it will be necessary to analyse in greater detail the nature of the fill and its degree of consolidation. The aquifers are extensive and highly permeable, favouring the drainage of water, although they may affect long-term stability if the groundwater level is not managed appropriately.

Seismic activity in this municipality is very low, with only two significant events over three decades and a maximum recorded magnitude of 2.2, so it does not represent a relevant constraint in structural design. The risk of expansivity is nil thanks to the dominance of non-clayey soils, ruling out impacts associated with volumetric changes due to moisture. Thus, the fundamental constraint lies in the localised presence of loose or very fine materials, which must be characterised in any geotechnical study prior to foundation works.