Assessment of Slope Stability by the Fellenius Slice Method: Analytical and numerical approach

Abstract

Slope stability is a topic of great importance in civil engineering, as slope failures can cause considerable damage to infrastructure and downstream properties. In this study, we applied the Fellenius slice method, using both the analytical method, as well as the numerical method, which was performed using the SLOPE/W module of the Geostudio software. The results obtained by both methods showed that the increase in soil cohesion improves the stability of the slope. The safety coefficients obtained by the analytical method vary between 0.534 and 1.086, while those obtained by the numerical method vary between 0.539 and 1.096, for cohesion values ranging from 4 kPa to 20 kPa. The safety coefficients obtained by the analytical and numerical methods follow straight lines of equation y=0.0344x+0.4092 and y=0.0345x+0.4169, respectively. The results of the analytical method show that a safety factor of 1.5 is achieved at a value of 32 kPa for the cohesion, while the numerical method shows a safety factor of 1.5 achieved at a value of 32 kPa for the cohesion. The difference between the two cohesions is explained by the smaller number of slices used in the analytical method. Nevertheless, the equation from the analytical method can be used as a general guide to evaluate the evolution of the safety coefficient of a slope with surcharge under long-term behavior with incremental cohesion, but this does not exclude verification by dedicated software based on the finite element method.

Study of Slope Stability Using the Bishop Slice Method: An Approach Combining Analytical and Numerical Analyses

“…This finding is of Table 1. Geotechnical parameters [1]. great importance as it underlines the advantage of the Bishop method over the Fellenius method in terms of accuracy and reliability of results.…”

“…Analytical and numerical analysis techniques were used to assess stability, taking into account additional loads. The geotechnical characteristics and geometric configuration of the embankment were based on studies by [1].…”

“…Embankment stability is a crucial issue in civil engineering, as demonstrated by several sources. Slope stability is a topic of great importance in civil engineering, as slope failures can cause considerable damage to infrastructure and downstream properties [1]. Slope stability is a worldwide problem which above all affects people's safety [2].…”

“…The overall objective of this study is to add to the existing knowledge of slope stability assessment using Bishop's slice method, building on previous work with the slice method used by [1], [24] in Slope Stability Analysis Using Slice-Wise Factor of Safety, in order to improve the understanding and application of slope stability analysis methods. This study follows on from our study [1].…”