Stability Analysis of Natural Slopes: Comparative Analysis Between the Strength Reduction and Stress Analysis Methods
Abstract
Natural slopes exhibit a variable cross-section, limiting the applicability of methods developed for regular slopes with constant cross-sections. This study aimed to compare the SAM and SRM methods by analyzing the stability of a slope with two inclinations (54º and 31º). The methodology involved obtaining a topographic surface and analyzing it using the MIDAS GTS NX program to demonstrate the influence of slopes and the analysis method on the factor of safety. The results showed that the influence of slopes is greater than that of the methods. Additionally, it was found that for small slopes, both methods yield similar results for small element sizes in the mesh, while for large slopes, the SAM method is less conservative, presenting values up to 130 % larger compared to SRM. Furthermore, the results obtained with the SAM method indicate that the steep slope is 13.7 % more stable than the gentle slope, which is not realistic. Additionally, the statistical analysis performed shows differences of -0.4 between the SAM and SRM methods on the steep slope, reinforcing the imprecision of the SAM method in obtaining the factor of safety in slopes with high inclinations compared to the SRM method. Therefore, it was concluded that the SRM method is much more effective than the SAM. In addition, it is recommended to use the SAM method as a complement to the SRM method for slopes with low inclinations.
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