Assessment of Slope Stability by the Fellenius Slice Method: Analytical and numerical approach
1 National School of Technical Education (ENSET- UNSTIM), Lokossa, Bénin
2 Laboratory of Test and Studies in Civil Engineering (L2EGC), ENSTP, Abomey, Benin.
3 Materials and Structures Laboratory (LAMS), VERECHAGUINE A. Higher School, Cotonou, Benin.
Research Article
World Journal of Advanced Research and Reviews, 2023, 18(02), 1205-1214
Article DOI: 10.30574/wjarr.2023.18.2.0874
Publication history:
Received on 11 April 2023; revised on 22 May 2023; accepted on 24 May 2023
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.
Keywords:
Slope; Stability; Safety Factor; Cohesion
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Copyright © 2023 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution Liscense 4.0