Estudio geotécnico in Grazalema

In the municipality of Grazalema, sandstones, conglomerates and flysch predominate; these materials represent more than 60% of the substrate, followed by limestones, dolomites and marbles, and to a lesser extent, loose deposits of gravels and sands. The dominant composition provides a generally competent foundation for the construction of buildings, although the occasional presence of loose materials may require additional studies to avoid localised zones of low bearing capacity. In areas with soils of a rocky nature, a good load-bearing capacity is available for direct or semi-direct foundations.

The seismicity of Grazalema is moderate, with 27 events over 30 years and a maximum magnitude of 2.7, which does not impose significant restrictions on structural design. However, as limestones occur frequently, it is very important to check for the presence of karstic cavities before proceeding with foundation work, as they can affect ground stability. Since the substrate is mostly non-clayey, the risk of expansiveness is ruled out, with karst being the main geotechnical factor to verify in the geotechnical study for this municipality.