Slope stability analysis using modified Fellenius’s and Bishop’s method

Abstract

Analysis of slope stability is very important as many structures in hilly areas failed due to instability of slope. The aim of this study is to determine the factor of safety (FOS) of slopes located at Pahang Matriculation College by using limit equilibrium method. Two methods known as modified Fellenius’s method and modified Bishop’s method are used in this study. Laboratory testing involving index and engineering properties are conducted to determine the properties of soil within the study area. The soil at Pahang Matriculation College can be classified as sandy SILT with high plasticity. From the analysis, the FOS values for two slopes in saturated soil conditions (0 kPa suction) are between 1.262-2.885 when using Bishop’s method which are higher compare to 1.199-2.688 when using Fellenius’s method. The percentage differences of FOS between these two methods are between 5.25% to 7.33%. For slopes in unsaturated conditions (20 kPa suctions), the FOS are between 1.550-3.702 when using modified Bishop’s method which always higher compare to 1.492-3.507 when using modified Fellenius’s method. The percentage differences of FOS are between 3.89% to 5.56%. The relative accuracy of Bishop’s method is due to it consider only the vertical equilibrium of each slices and there is no need to consider the horizontal components of the interslice forces without introducing serious error in the FOS value.

Comparison between DS, DSS and Triaxial Resistance Tests in Compacted Tropical Soils in the State of Rio de Janeiro, Brazil

“…The soil worked by Fortes [14] is the closest geologically with Point 1, since they are both tropical soils. Probably, the difference between the tests by Mello (1946) and Schroder [15] is due to the geological formation of the studied soil, since the last two are temperate soils [16][17][18][19][20][21][22][23][24][25].…”

Development of the scaled boundary finite element method for image-based slope stability analysis

“…A convergence tolerance and iteration ceiling limit of 0.0001 and 500, respectively, are considered for the elasto-plastic analysis process (Smith & Griffiths, 2004). In numerical analysis of slope stability, the FoS is usually reported up to 2 decimal places depending on the type of numerical technique employed (Zolkepli et al, 2019). However, for mining applications such as that considered in this study, FoS values reported up to 1 decimal place is deemed sufficient.…”

An Analysis of Single Slope Stability at Pemenang Road Using Bishop Method

“…the ground surface does not always form flat plane or have differences elevation between one place and another other to form a slope (slopes) [5]. Landslide is a disaster nature that often occurs on the slopes natural or artificial [6] [7]. The slope is a ground surface inclined and forms a certain angle to a horizontal plane [8].…”