Soil Embankment Stability Analysis With Geotextile Reinforcement (A Case Study At Embankment Sta 7+500 Of Cibitung - Cilincing Toll Construction Project)

Abstract

The construction project of Cibitung – Cilincing is part of the government’s mandate to realize Medium Term Development Program (RPJMN), in order to support the national economic growth strategy which has significant role in supporting the effectiveness of distribution from surrounding industrial areas and increase accessibility and capacity of the traffic. In Cibitung – Cilincing there are many embankment slopes, especially embankment that carried out by the researcher at Sta. 7+500 which has height of 9m with 1V: 2H slope tilt. The purpose of this research is to obtain the safety factor (SF), and the consolidation value that occurs for one year. Embankment stability analysis calculated using finite element method and Fellenius method will be used to find the safety factor (SF). This research uses model of existing embankment, embankment with topography improvement namely 1 trap embankment, 2 trap embankment and 3 trap embankment variations. The embankment with 1 layer geotextile UW-250 woven is to reinforced the embankment namely existing embankment with geotextile reinforcement, embankment 1 trap variation with geotextile reinforcement, embankment 2 trap variation with geotextile reinforcement and embankment 3 trap variation with geotextile reinforcement. In addition to analysing the safety factor, the value of consolidation that occurs on the embankment estimated for one year (365 days). The results analysis safety factor of the existing embankment has a value 1,0306 and the analysis with Fellenius method has a value 1,0621 so, it can be concluded that the structure of the embankment is lower than the requirement needed (SF =1.5). For the modelling embankment with topography improvement namely, 1 trap has safety factor 1,0771 with consolidation settlement 0,27747m, modelling embankment 2 trap has safety factor 1,1147 with consolidation settlement 0,22237m, modelling embankment 3 trap has safety factor 1,1560 with consolidation settlement 0,17773m. For the modelling embankment with geotextile reinforcement namely, existing embankment with geotextile reinforcement has safety factor 1,3135 with consolidation settlement 0,13874m, 1 trap embankment with geotextile reinforcement has safety factor 1,4035 with consolidation settlement 0,11119m, 2 trap embankment with geotextile reinforcement has safety factor 1,6197 with consolidation settlement 0,09670m, 3 trap embankment with geotextile reinforcement has safety factor 1,8895 with consolidation settlement 0,08887m. So, the geotextile reinforcement has the great effect on the modelling in existing embankment and modelling embankment with topography improvement in resulting greater safety factor and has smallest consolidation settlement.