Geotechnical study in Gelida

In Gelida, the geological substrate is dominated by formations of limestones, dolomites and marbles, which constitute approximately 50% of the soils. Also found, in smaller proportions, are fine sands and silts, gravels and compact sands, as well as sandstones, conglomerates and flysch. This composition generally provides good bearing capacity for building works, although the occasional presence of gypsum, anhydrite and salts requires special attention due to the potential risk of dissolution when in contact with water. For foundation projects, it is essential to plan a comprehensive geotechnical study that makes it possible to identify the depth and characteristics of the most suitable ground for transmitting structural loads.

Seismicity in Gelida is very low, with only six recorded events over thirty years and a maximum magnitude of 2.6, so its influence on structural design is secondary. The non-clayey substrate removes concern about expansive soils. However, given the marked predominance of carbonate materials susceptible to the development of karst, it is essential to verify any possible cavities or instabilities associated with them before carrying out any foundation. The main geotechnical constraint in the area is the possible presence of karst-related phenomena, meaning that characterising the subsoil is a critical stage in the project planning phase.