Análise numérica de uma escavação grampeada

Abstract

The soil nailing technique is being increasingly used in slope stabilization works. The use of computer systems in soil reinforcement projects with nailing is becoming increasingly present in the offices. Still, there is no Brazilian standard to better target the implementation of this type of stabilization. This paper presents a case study of an instrumented work in Japan where the excavation of 13.50 meters proceeded on a granitic residual soil. Calibration of the model was performed using the Plaxis program for software validation and further analysis. The results of the studies showed how efficient and simple can be the adoption of Plaxis as a support tool for nailed soil structures. Further analyses to the calibration were based on some parameters that can influence the magnitude of the maximum horizontal displacements of the structure. There is still a hesitancy of researchers / performers of this technique over the ideal thickness of the vestment, ensuring local stability, providing speed in work and also lowering costs. For this reasons, tests were carried out on different face coating thicknesses and the assessment of their influence on the magnitude of the maximum horizontal displacements. It was also possible in this research to carry out an analysis of maximum efforts in the nails by modeling and later comparing the results with the data provided in the instrumentation. It was also performed a comparison between different execution processes and their influence on the maximum displacement values. The results made possible to confirm the capacity and utility of Plaxis program on the development and preparation of nailed soil projects, in addition to having a better understanding of the factors that influence the magnitude of the horizontal displacement of the structure.