Geotechnical study in Atarfe

In Atarfe, the subsoil is characterised mainly by the presence of fine sands and silts, which cover most of the area and provide a moderate bearing capacity, conditioning the design of shallow foundations and recommending localised studies to detect possible ground subsidence. The formations of limestones, dolomites and marbles, which are also present to a significant extent, can provide good levels of support, although it is crucial to take into account their low permeability and the possible presence of aquifers at depth. White or soft expansive clays are only occasional and the water horizons and overconsolidated clays will rarely affect the usual foundation solutions.

Seismic activity in the area is high, with around 200 events over thirty years and a maximum magnitude close to 4.4, which requires this factor to be considered in structural calculations. The existence of karst formations implies the need to thoroughly check for possible voids or cavities before carrying out any foundation work, as these can cause unforeseen settlement. As for expansivity, the non-clayey substrate rules out significant problems in this respect. The fundamental constraint for the geotechnical study in Atarfe is therefore the combination of high seismicity with the risk of karstification in the limestone areas.