Comparison of Embankment Reinforcement Requirements with Geotextile on Soft Soil with 2D and 3D Slope Stability Analysis Methods

Abstract

Slope stability analysis is very important in slope design so it can manage and maintain the infrastructure assets. If the slope is unstable, it can damage the infrastructure around the slope. The method commonly used in slope stability analysis is 2D modeling which assumes the length of the landslide area is not limited or continuous. Landslides that occur in the field are limited and not continuous, so 3D modeling is more suitable than 2D modeling. 3D slope stability analysis has been developed by various researchers. Most of the results of previous studies stated that the 3D and 2D factor of safety ratio were more than one for cohesive soils and less than one for non-cohesive soils. This safety factor affects the amount of reinforcement needed. Differences in 2D and 3D safety factors will cause differences in the amount of reinforcement needed. Therefore, this study was conducted to determine the differences in the 2D and 3D slope stability analysis result. Slope stability analysis was carried out using LEM, where the 2D slope stability used the Fellenius method while the 3D slope stability used the Hovland method. Calculate the required reinforcement amount using geotextiles with Tilt = 250 kN/m. The results obtained from this study are the 2D safety factor is smaller than the 3D safety factor. The 3D and 2D safety factor ratios range from 1.09 -1.397. While the amount of reinforcement required in the 3D analysis is less than in the 2D analysis with the ratio of 3D and 2D reinforcement requirements ranging from 0.5 to 0.955 depending on the width and height of the embankment.

Analysis of Existing Slope Reinforcement Design on Clay Shale Soil and Its Alternative Modifications: A Case Study of the Awunio – Lapuko Road Section Sta 4+955 – 5+015 in the Southeast Sulawesi Province

“…Slope stability analysis can be carried out using several methods, such as the Limit Equilibrium Method (LEM), Finite Element Method (FEM), Finite Difference Method (FDM), and others. The most popular and frequently used method is the LEM (Shoffiana et al, 2022). The slope stability analysis is divided into two conditions: against the existing slope and the existing design, using manual calculation methods and the GEO5 software.…”

Existing Design Analysis of Slope Reinforcement on Clayey Soil and Its modified Alternatives (Case Study : Awunio – Lapuko National Road, Southeast Sulawesi)

“…The number of geotextile layers depends on the difference in the value of the moment of resistance in the embankment soil, so that a sufficient SF is achieved. Calculation of the number of geotextile requirements is carried out in stages until the total moment of the geotextile (∆ Mgeotextile) is equal to or greater than ∆MR (Shoffiana et al, 2022).…”

Slope Stability Analysis for Landslide in Road Preservation Working Packages Ende - Wolowaru and Junction – Kelimutu Sta 10+475

“…The existing inclinations, whether on embankment slopes, excavation slopes, or natural slopes, must be designed to be stable and safe. (Shoffiana et al, 2022). The control method applied involves arranging the slope by limiting the slope height to 5 meters and regulating the slope inclination to be at a ratio of 1 horizontal unit to 1 vertical unit (1H:1V).…”