MODELAGEM GEOELÉTRICA, DISCUSSÕES E ANÁLISES DE ENGENHARIA SOBRE O IMPACTO DA TERRAPLANAGEM NOS MODELOS DE SOLO ESTRATIFICADOS EM MÚLTIPLAS CAMADAS

Abstract

Grounding systems are influenced by two main factors: the geometry of the grounding electrodes and the electrical resistivity of the soil. This paper discusses and analyzes the modeling of soil electrical resistivity, at low frequencies, for applications in electrical engineering. For this purpose, the Wenner method is used to experimentally obtain soil resistivity values for different depths. Right away, the sample data is used to model the soil as homogeneous or stratified into two or three horizontal layers. When choosing the most appropriate model to represent the electrical characteristics of the soil, the criteria of simplicity and percentage deviation are used. In the simplicity criterion, it is observed that if a simpler soil model can satisfactorily represent the soil, this model should be used to the detriment of other more complex models. In the percentage deviation criterion, the soil model is considered satisfactory for engineering applications when the percentage deviation between the sample data and the soil model is less than 10.0%. It is shown that, observing these criteria, civil earthwork interventions that are carried out on the ground, such as cuts and embankments, can be sensed by the soil models. Thus, carrying out earthworks can significantly modify the expected soil resistivity values of a site and soil models may be able to identify this.