Geotechnical study in Valladolid

In Valladolid, limestones, dolomites and marbles predominate, accompanied to a lesser extent by deposits of gravel and compact sands. These materials often show good bearing capacity and optimal conditions for shallow or semi-deep foundation techniques. However, the occasional presence of gypsum, anhydrite and salts implies a risk of dissolution; this phenomenon can affect ground stability and requires detailed characterisation before any foundation project. In addition, the occurrence of water masses and the generally low permeability of the formations may complicate the management of the groundwater table on site.

Seismicity in Valladolid is high, with more than 200 events over 30 years and a maximum recorded magnitude of 4.7, which makes it necessary to incorporate earthquake-resistant design criteria into the structures. Given the predominance of carbonate rocks, the karst phenomenon is relevant and must be thoroughly verified to avoid unexpected subsidence problems. The non-clayey substrate rules out significant expansivity risks. In conclusion, the main conditioning factor for building in Valladolid is the possible presence of karstification and dissolution of gypsum phenomena, together with the necessary consideration of the local seismic response.