Geotechnical study in Castellar de la Frontera

In Castellar de la Frontera, the predominant geotechnical strata correspond largely to sandstones, conglomerates and flysch, which provides good bearing capacity parameters for shallow foundations, particularly in areas where these materials are little altered and dense. Limestones, dolomites and marbles also have a significant presence, offering competent soils suitable for most structural solutions. Formations of compact gravels and sands, although less frequent, present favourable conditions for founding, whereas levels of fine sands and silts require specific assessment if they occur in the development area, due to their possible lower cohesion and greater compressibility.

Seismic activity in the municipality is moderate, with 16 events recorded over the last 30 years and a maximum magnitude (Mmax) of 2.6, indicating a low seismic risk, with no special requirements for structural design from the seismic point of view. The non-clayey substratum eliminates any concerns related to soil expansivity, allowing projects to be planned without risks associated with swelling or shrinkage due to moisture. The main geotechnical constraint in Castellar de la Frontera lies in the local heterogeneity of the materials and the possible variability of permeability conditions, which makes it essential to carry out a geotechnical study beforehand to ensure the success of any construction development.