ABSTRACT
This paper presents a case study of piled embankment system with geosynthetic as reinforcement for soft soil subgrade at the Kadusirung Flyover's approach slabs, Banten, Indonesia. The embankment was reinforced with GSRW (Geoforce Segmental Retaining Wall) system with height of up to 9 metres. GSRW is a retaining wall construction that consists of a compacted layer of backfill and has a facing made of precast concrete and reinforced using polyester strip. Due to the low bearing capacity of the subgrade, piled embankment with geosynthetic system was chosen to reinforce. To help transfer load to the pile and to consider the soil arching ratio, a combination of small pile cap and high tensile strength geogrid was used. From design perspective, the system improves safety factor above the criteria stated in Indonesian National Standard for Geotechnical Design Requirements which is above 1.50 and design with pseudostatic earthquake load which is above 1.10.
