Estudio geotécnico in Illescas

In Illescas, the predominant ground is made up of sandstones, conglomerates and flysch, covering more than 70% of the area, with a secondary presence of limestones, dolomites, marbles and, in smaller proportion, gravels, sands and gypsum. The main strata usually exhibit good compaction and adequate bearing capacity, although the localised presence of gypsum, anhydrite and salts implies paying particular attention to possible dissolution phenomena or collapses if these horizons are used as support for foundations. Therefore, detailed characterisation through a geotechnical study is essential to determine the optimal foundation solution at each location, also taking into account local heterogeneity.

Seismic activity in Illescas is high, with 200 recorded events in the last 30 years and a maximum reported magnitude of 5.1, which means that the seismic action must be seriously considered in the structural design calculations for projects. In addition, since karst development exists mainly associated with limestones and gypsum, it is essential to verify ground stability against underground voids before founding. Expandability, although present only in a subordinate manner, should not be completely ruled out. Overall, the main geotechnical constraints in Illescas are the high seismicity and the risks associated with karst processes and dissolution, which require detailed studies for characterisation and monitoring.