Geotechnical study in Chimneys

In Chimeneas, the dominant subsoil is composed of fine sands and silts, with a significant presence of gypsum, anhydrite and salts. These characteristics imply a moderate bearing capacity, although it may vary locally. The presence of muds and peats, albeit occasional, represents a soil level that must be avoided for direct foundation support due to its low strength. It is essential to assess correctly the location and thickness of the gypsum- and sulphate-bearing strata given the risk of dissolution and the associated effects on ground stability.

Seismicity in Chimeneas is notable, reaching 84 events over 30 years and a maximum magnitude of 4.2; although this magnitude does not exceed the relevant threshold, the recurrence requires considering moderate seismic actions in the structural design. With regard to karst, the presence of materials susceptible to it—especially gypsum and limestones—requires specific verification of cavities and dissolution processes before foundation design to ensure structural safety. The non-clayey subsoil rules out risks due to expansivity, with the risk of dissolution and the possible instability of karstified areas being the main geotechnical limiting factor.