Distribuição espacial da resistência a penetração do solo (NSPT) no município de Frederico Westphalen - RS

Abstract

Assessing the geotechnical characteristics in urban areas is fundamental for planning public and private actions in civil construction. Thus, the objective was to carry out a spatial analysis of variations in the number of Standard Penetration Test (NSPT) in part of municipality of Frederico Westphalen, RS, Brazil. The study area covers approximately 18.5 km² and was represented by 60 NSPT samples at different depths (2 to 14 m), derived from reconnaissance surveys. Complementary, the characterization made use of elevation data (FABDEM 1.2) and land cover. Statistical tests and thematic cartographic mapping were conducted in geographic information systems (GIS). In general, the maps showed that the north, south and east regions of the Municipality's urban area have more resistant soils, while in the west region the subsoil has intermediate resistance. The central region included the area with less resistant soils. It was also found that the area analyzed has greater variability in resistance at initial levels and that the impenetrable material is generally found between levels 5 m and 9 m below the surface. A notable difference in the NPS values was observed when analyzing the variation of only 1 meter, from the elevation of 3 m to the elevation of 4 m. In addition, the analyzed area has a greater variability of resistance at the initial elevations and the impenetrable is usually between the elevations 5 m and 9 m below the surface. In addition, it was found that in the same region (same geological-geotechnical formation), there are differences in soil resistance to penetration, differences in the depth of the water table and the impenetrable level. In this context, in addition to being a pioneering study in the Fredericense scenario, the work brings together important geotechnical information that can be used by the city hall of the city of Frederico Westphalen as a subsidy to map areas for new constructions that are of interest to public bodies and private companies aiming to economic viability, since the value of the foundation in a project can vary from 3 to 7% of the total value. To this end, the documents generated in this research can also be used as an aid in the negotiation and acquisition of land, as preliminary estimates of the geotechnical characteristics of the area of interest will facilitate the pre-choice of the type of foundation solution that should be used in the construction. of the enterprise.