Estudio geotécnico in Sant Joan

In Sant Joan, the substrates formed by sandstones, conglomerates and flysch predominate, and these occur in most areas of the municipality. These materials usually provide a suitable base for foundations, exhibiting adequate bearing capacity and generally stable behaviour. In specific areas, gravels, compacted sands and intercalations of fine sands and silts are found; these latter may require a specific assessment to avoid differential settlement problems, although the risk is limited owing to the low representativeness of these deposits.

Seismic activity in Sant Joan is classified as moderate, with a total of 24 events over the last 30 years and a maximum magnitude of 3.2, which implies that seismic actions do not represent a principal constraint for foundation engineering in the area. The absence of an clayey substrate rules out significant risks due to expansiveness; there are also no signs of karst processes that could affect stability. Consequently, the key geotechnical factor will be the correct characterisation of the predominant ground type, particularly in areas of lithological transition or where finer materials are present on a localised basis.