Dimensionamento geotécnico de solo grampeado

Abstract

This work presents the design of soil nailing executed in an excavation. The stapled soil is a soil improvement and has the function of promoting stability to the slope. The studied excavation is 5 m high with 90º slope in relation to the horizontal axis in a soil of geotechnical characteristics from the city of Uberlândia-MG. From the result obtained in the pre-dimensioning, two scenarios were studied: the first one with nails of constant length along the height of the excavation, and a second one with nails that vary its length in the last rows. The most economical solution was chosen for this project and stability analyzes were made by limit equilibrium and stress-strain by finite elements (displacement verification). Coupled with the stability analyzes, statistical tools were used to obtain the probabilistic safety factor (FS mean) and probability of failure (PF). In order to analyze the sliding stability and the horizontal displacements, the software Slide 2018 and RS² of the Rocscience platform were used. This numerical analysis allowed to conclude that both solutions presented stability to the sliding superior to that required by Brazilian standards (ABNT NBR 11682: 2009) and horizontal displacements smaller than the allowable ones. Keywords: