Geotechnical study in Colindres

In Colindres, sandstone, conglomerates and flysch predominate, providing a solid and suitable basis for conventional foundations, although specific areas are identified with fine sands and silts that may reduce bearing capacity if they are located at the surface or in significant thicknesses. The limestones, dolomites and marbles present in smaller proportions may be associated with local variations in geotechnical behaviour, and the occasional presence of anthropogenic fill requires additional caution to rule out zones of low compaction before executing foundations. The general impermeability of these formations limits infiltration, favouring stability, but any possible shallow aquifers need to be checked, especially for underground works.

Seismicity in Colindres is rated as notable, with 145 events over 30 years and a maximum magnitude of 4, so it is relevant to take these parameters into account in the structural design calculations for projects. Although the subsoil is not clayey and therefore there is no risk of soil expansivity, the karstified context associated with the calcareous formations makes it necessary to carry out specific geotechnical studies to rule out cavities or subsidence before deciding on the foundation system. The possible presence of karst is the main factor to assess in the area, given its potential impact on the long-term stability of the buildings.