Slope Stability Analysis By Using Geotextile Reinforcement And Considering Of Groundwater Level Variance

Abstract

To improve accessibility and capacity for traffic in the industrial sector, which is helpful in raising productivity, the Cibitung-Cilincing toll road was developed in Bekasi City. This last project's analysis aims to compare the slope's safety factor before and after it has been strengthened using geotextiles. The method used on the existing slope is by using the plaxis 8.6 program and to find the safety value of the slope with the Slice Method (Fellenius). On the slopes reinforced with geotextiles, the analysis was carried out using the plaxis 8.6 program and groundwater table variations were also taken into account in the design with variation of 6 meter, 4 meter, 3 meter, and 0 meter. The safe value for the 12.5m embankment was obtained when the original soil was 1.1138 for traffic structure load and 1.1131 for traffic and earthquake load. Geotextiles were then used to strengthen the 12.5m embankment. The reinforced 12.5 m embankment's analysis with reinforcement produced a higher safety number than was necessary of 1.3 that are 1.3983 for traffic structure load and 1.3322 for traffic and earthquake load.. For a groundwater level of 6 meters, the slope safety figure for selfloading is 1.3297, with vehicle loads and earthquakes being 1.3280. For a groundwater level of 4 meters, the slope safety figure with self-load is 1.3263, and with vehicle loads and earthquakes is 1.3252. At a groundwater level of 3 meters, the slope safety figure with self-loading is 1.3210, and with vehicle loads and earthquake loads is 1.3033. At a groundwater level of 0 meters, the slope safety figure with self-loading is 1.0970, and with vehicle loads and earthquake loads is 1.0891. Thus, all slope safety values meet the requirements

1.3 except the 0 meter groundwater level that below 1.3 but above 1.0 ehich means have a doubtful stability condition. Based on the analysis above, slopes with geotextile reinforcement are able to withstand landslides up to a groundwater level of 3 meters from the surface of the slope.