Geotechnical study in Manilva

In Manilva, the geological substrate is dominated by limestones, dolomites and marbles, stony materials that make up more than 65% of the surrounding area. This substrate provides a notable bearing capacity for foundations, although the occasional presence of fine sands and silts, together with smaller levels of sandstones and flysch, requires appropriate local characterisation during the design stage. These predominant materials, with low to very low permeability except in the case of accumulations from shallow aquifers, tend to favour shallow foundation construction provided that any possible presence of altered zones or made ground is controlled.

With regard to geotechnical behaviour, Manilva’s seismicity is moderate, with 13 events recorded over 30 years and a maximum magnitude value of 3, indicating a low impact on structural design. Given the carbonate nature of the substrate, it is essential to verify the presence of karstification before any foundation work, as cavities may compromise the safety of the project. Likewise, as the substrate is non-clayey, the risk of expansivity is ruled out. Appropriate ground investigation should focus on detecting karst as the main geotechnical condition affecting the area.