Geotechnical study in San Mateo de Gállego

In San Mateo de Gállego, the predominant geotechnical substrate consists of compact gravels and sands, exhibiting a high bearing capacity and facilitating the design of shallow foundations on these materials. Fine sands and silts are also frequently found; these require careful assessment of their behaviour in saturated conditions. The occasional presence of gypsum, anhydrite and salts is noteworthy, as it introduces risks associated with dissolution on contact with water, particularly in areas close to water bodies or where extensive aquifers with high permeability are developed.

Seismic activity in the area is classified as significant, with 68 events in the last 30 years and a maximum magnitude of 4.8; this factor should be considered in the structural calculation of buildings. In addition, the presence of limestone, dolomite and marble outcrops implies the possible occurrence of karstic phenomena; it is essential to verify the development of cavities before defining the foundation type. The absence of an clayey substrate rules out risks due to expansivity, emphasising that the main constraints for the geotechnical study in San Mateo de Gállego are the threat of dissolution processes in areas with gypsum and the need to control instabilities linked to karst and seismicity.