In densely populated urban areas, landslides generally cause large economic, social and environmental damages as well as, quite frequently, the loss of human lives. The main triggering factor for soil slope failures is the occurrence of heavy rainfalls and the most affected slopes are those with little vegetal covering or that had suffered recent changes in topography, generally due to the execution of cuts and excavations. In this work, stability analyses of a soil slope located at km 55+800 of the Transpetro’s OSPAR oil pipeline were carried out In 1995, the works for the duplication of the BR-376 highway, connecting the cities of Curitiba and Joinville, caused some instability in certain area of the soil slope. Later, in January 1997, during a period of heavy rainfall, a new landslide near the slope toe provoked the failure of the existing retaining wall and triggered a series of successive slides that reached the protected area were the oil pipeline was buried. In order to better understand the mechanics involved in this process, numerical analyses were carried out using the computational programs Slope/W, Sigma/W and Plaxis v.8. The soil behavior was simulated considering the hard soil model, whose constitutive parameters were estimated from triaxial tests. The influence of soil movements on the OSPAR oil pipeline were investigated through a 3D finite element analysis, with emphasis on stress and strain distributions in order to check the pile line structural integrity.