Estudio geotécnico in Porriño, O

In O Porriño, the dominant subsoil is composed mainly of fine sands and silts, which is very common in the area. This type of soil may exhibit medium to low bearing capacities, especially in sections where silts predominate, which influences the selection of the foundation type. The presence of formations that are generally impermeable or have very low permeability is relevant, as they can create shallow aquifers, affecting both drainage and any possible uplift pressures beneath the foundations during periods of heavy rainfall.

With regard to seismicity, in O Porriño 47 events have been recorded in the last 30 years with a maximum magnitude (Mmax) of 2.9, which corresponds to a moderate level of seismic activity; it is not a factor that implies major constraints for structural design. As for expansivity, the presence of non-expansive or dispersive clays within a non-clayey matrix means that the risk of expansivity is low. The main geotechnical constraint in the area lies in the nature and compaction of the sands and silts, as well as in controlling the groundwater table.