Análise de encosta instrumentada com histórico de movimentações

Abstract

In the present study, an analysis of the movements inherent to a cut slope is conducted, located on a notable highway within the state of Rio de Janeiro. This slope, predominantly composed of a remaining matrix of sandy nature, exhibited manifestations of persistent displacements throughout the time interval between the year 2005 and the year 2021. In this context, the present study sought to establish an association between the movements, which were verified and documented through geotechnical instrumentation campaigns, and assessments related to horizontal deformations, facilitated through the use of the RS2 software. Stability analyses were also performed, using computational programs that adopt the finite element method (RS2) and the limit equilibrium method (Slide 2). The stability analyses, along with the study of horizontal deformations, were based on the oscillations identified in the piezometric levels, which became evident during periods of high rainfall. These levels were obtained through measurements taken by water level indicator sensors, conveniently placed in the study area. The results from inclinometer readings, when compared with the outcomes predicted in the finite element analyses, demonstrate agreement in the order of magnitude. Simultaneously, a meticulous comparison was carried out among different methods for evaluating geotechnical stability, which led to obtaining safety factors in various scenarios of the studied slope. Among these situations, the nearly full saturation condition of the mass stood out, resulting in safety factors lower than 1.00, indicating the imminent collapse of the analyzed geological mass.