Geotechnical study in San Juan de Aznalfarache

In San Juan de Aznalfarache, soils predominate that are formed by masses of water in combination with limestones, dolomites and marbles, as well as the occasional presence of fine sands and silts. This geological setting provides high ground permeability due to the carbonate nature of the ground and extensive and productive aquifers, which usually favours the bearing capacity of the substrate, although it is essential to study in detail the water–soil interaction in order to determine the best foundation solutions.

Seismicity in the municipality is very low, with hardly one event every thirty years and a maximum magnitude of 1.7, which does not pose significant restrictions for structural design. Although there are non-expansive or dispersed clays in a non-clayey matrix, the risk of expansivity must be reviewed in each particular case, although it will generally be low given the calcareous nature of the ground. The main constraint is the influence of the aquifers on the stability and behaviour of the foundations.