A DESIGN OF MECHANICALLY STABILIZED EARTH WALL WITH GEOTEXTILE REINFORCEMENT BASED ON THE FEDERAL HIGHWAY ADMINISTRATION STANDARD A CASE STUDY: PONDOK HIJAU RESIDENCE, BANDUNG Budijanto Widjaja, Vincent Justin Wismanto
Parahyangan Catholic University
Geotextile is one of geosynthetics constructed on an embankment functioning as its reinforcement to support tension force from the loading design, so the embankment will show less failure potential. Referring to the Federal Highway Administration standard, geotextiles designed under static and dynamic loading on a 7.5 m tall earth wall at Pondok Hijau, Bandung. The reinforced earth wall is further known as a Mechanically Stabilized Earth Wall. The FHWA design calculation uses the simplified coherent gravity method while the final analysis is based on limit equilibrium and finite element methods. The FHWA calculation produces preliminary design as follows: a 6.5 m long geotextile with 200kN/m ultimate tensile strength is placed at every 30 cm at the first layer, 50 cm from the second to the seventh layer, and 30 cm from the eighth to the twenty first layer. As the result, the maximum horizontal deformations of geotextile due to static and dynamic loading are 2.94 cm and 4.6 cm respectively. The wall itself also deforms as much as 5.07 cm due to static loading and 7.93 cm due to dynamic loading. For the record, the allowable deformation of geotextile and the wall are 27.3 cm and 10 cm respectively. Hence, the preliminary design is valid according to the deformation requirements.