Estudio geotécnico in Tossa de Mar

In Tossa de Mar, the dominant bedrock is composed of granites, gneisses and other igneous rocks, present in 86.67% of the municipality. This type of rock provides ground with excellent bearing capacity, which allows the use of shallow direct foundations with minimal precautions, provided that compaction and the alteration level of the rock mass do not show any friable zones. Compact gravels and sands occur occasionally, acting as materials with good compaction and low deformability, although their relative density and moisture content must be verified in order to found on them.

Local seismicity is moderate, with 23 events over the last 30 years and a maximum magnitude (Mmax) of 3, so it is not considered a restricting factor for structural design in the area. The substrate identified as non-clayey rules out any risk of expansivity, removing this concern during the foundation phase. The main constraint in Tossa de Mar will therefore be to ensure the correct characterisation of the supporting rock and the control of altered zones, with no relevant risks either from karstification or from soil expansion.