Geotechnical study in Los Gallardos

In Los Gallardos, fine sand and silt deposits predominate, which conditions the assessment of the ground’s bearing capacity. These materials, due to their texture and compactness, may show variable behaviour under loads, requiring foundation typologies that guarantee stability against differential settlement, especially in the presence of shallow groundwater levels. Occasional gravels and compact sands are also found, suitable for shallow foundations, in addition to minor outcrops of limestones, dolomites and marbles, which present better mechanical conditions.

As regards seismic activity, the area has a very low level, with only two seismic events in 30 years and a low maximum magnitude, so seismicity does not represent a relevant constraint for structural design. The possible presence of karst phenomena must be verified through specific studies before defining the foundation typology, as underground voids may exist in calcareous areas. Expansive clays appear in a subordinate manner and, according to the data, do not constitute a priority risk factor. Overall, the most relevant aspect for ground viability is checking for karst in calcareous soils.