Analysis Of Slope Stability With Soil Nailing Reinforcement Using Plaxis Program (Study Case: Sta 7+300 Of Tawang-ngalang Segment Iv Road And Bridge Project)

Abstract

Retaining walls can be designed using soil nailing as reinforcement according to the soil characteristics and seismic profile of the site. This research explores the Factor of Safety (FS) and the displacement of roadside soil nailing retaining wall of different configurations located in Yogyakarta, Indonesia. This research analyzes the effect of static loading representing a building atop the slope and dynamic loading of local earthquake ground acceleration value on the roadside retaining wall in clay soil to obtain the FS and displacement values. These values are obtained by modeling the variations of soil nail length, soil nail inclination, and soil nail vertical spacing, which is processed using Finite Element Method programmed into a software. After deciding the appropriate configurations according to preceding studies, the analysis is carried out, which observes the impact of different configurations on several reinforced slope features. The result of the analysis shows that across all models, the 20° nail inclination yields the highest FS, the same goes to 1,5 meters of vertical spacing. Soil nail length difference does not have notable impact towards the FS. The maximum value of displacement is the lowest at 20° nail inclination, with the lowest values for 2,5 meters vertical spacing. Earthquake loading brings down the FS about 0,4 points for all models with consistent results for both static and dynamic loading.