GEOFOAM MATERIALS UTILIZATION FOR BRIDGE ABUTMENT EMBANKMENT OF THE TRANS SUMATRA TOLL ROAD: A CASE STUDY

Abstract

In the archipelago of 17,508 islands, the road network system is a fundamental need to connect people and stimulate industrial growth in Indonesia. Geofoam technology has been used as a substitute for landfills in several areas that require high stability and carrying capacity to improve the quality and safety of toll roads. Geofoam has several advantages that make it very effective in constructing toll roads. The paper examines Geofoam's performance as a replacement fill material for approach bridge construction for the case location Trans Sumatra Toll Road Project Simpang Indralaya – Prabumulih Zone 6 STA 59 + 425. In addition, this study provides a case study and a brief overview of geofoam materials. Several implementation techniques are demonstrated, and some field-related challenges and solutions are discussed. FEM analysis through Plaxis was utilized to yield SF value and displacement output. The analysis results show that the safe number (SF) owned by the geofoam embankment produces a value above 2 for longitudinal and transverse cuts, which meets the safety requirement; the SF value offers 2.602 and 2.059 for cross-section analysis, while 2.955 and 3.306 for long section analysis. These results have the potential contribution of geofoam to sustainability projects, although the engineer should be able to cover the unexpected matters during the construction process.