Dimensionamento de taludes de terra sem percolação por meio da análise de estabilidade

Abstract

In the most diverse works in which there is a need to execute a slope, it is common to use inaccurate pre-dimensioning steps that use only the type of soil or tabulated values, causing possible reworks in cases of verified instability of the structure. Thus, this work aims to determine a predictive mathematical model, using geotechnical parameters, to obtain the slope angle of homogeneous and isotropic slopes. The methodology used initially comprehended632 numerical simulations, adopting the variability of parameters: height; specific weight; friction and cohesion angle in Geostudio2021.4 software using Slope/W and Seep/W modules. Then, a non-linear regression model was defined, using the Solver tool of Microsoft Excel, the coefficients of the mathematical equation were defined for the calculation of the slope angle for a minimum error. The mathematical model determined showed that the lowest values of height, cohesion and friction angle presented a very high percentage error. It was also observed that the specific weight variable may be disregarded from the equation due to the low values of its coefficients. For validation of the proposed equation, ranges of values presented in the literature for various types of soil and data outside the spectrum of values that were part of the modeling process were used, in addition to the use of a simplified version of the slope model studied in Lehmkuhl's work. and Abreu (2021). The results obtained showed acceptable safety factors for all types of soil. The present research also evaluated, in the validation process, the stability of the slopes using the concepts of resistance for unsaturated soils. For this condition, the models were stable, with safety coefficients above the recommended minimum values. Thus, the results found were promising, indicating that the model can be adopted for the design of slopes with acceptable safety conditions, justifying its use, so that costs and time are reduced.