Geotechnical study in Cambados

In Cambados, the dominant substrate corresponds to sandstones, conglomerates and flysch, which make up more than 60% of the ground, while fine sands and silts occupy a significant part of the municipality. These lithologies exhibit favourable mechanical behaviour, with a good overall bearing capacity, although the possible presence of silt levels with low compaction must be assessed. The formations mentioned generally have low permeability, except when they include specific shallow aquifers, and this directly influences the selection of the foundation type. In practice, conventional strip footings or slabs are usually viable after analysing the homogeneity of the ground.

The seismic activity recorded in the area is very low, with only 9 events over 30 years and a mild maximum magnitude of 2.4, which minimises the need for reinforcement against seismic actions in structural design. No karstification phenomena are detected either, and no risks associated with expansivity are presented, since the non-clayey substrate rules out this problem. In conclusion, the main focus of the geotechnical study in Cambados should be centred on identifying possible individualised silt layers or poorly compacted materials within the dominant formations.