Análise de um escorregamento ocorrido em um talude na RJ-116

Abstract

This study aims to understand a landslide occurred on a slope at km 78 of the RJ - 116 - Highway President Joao Goulart, Nova Friburgo - RJ. The slope at km 78 has a long history of movements, and some interventions were performed for the slope stabilization. However, the changes have not ceased, so there is necessity for more detailed investigation of the region's geology. Mixed surveys were performed to define the geological profile of the slope. In addition, the slope behavior was monitored with the assist of inclinometers and piezometers. In addition, soil samples were taken for obtaining soil parameters involved, based characterization test, direct and triaxial shear. In order to establish the causes of the movements of this slope from back analysis through traditional methods of analysis of limit equilibrium and finite element method, computer programs Plaxis and Slide for representative sections defined by the surveys were used. The water level was chosen based on piezometers, surveys and technical information. The results of the analysis showed the existence of two areas of displacement and also how much the water level influences the instability of the slope. To solve the problem of slope movement, it was proposed interventions of superficial and deep drainage in order to maintain the water level below its critical condition, and constant monitoring from field instrumentation.