A 21 m high embankment for an emergency ramp at the Kaneohe Interchange on Oahu,
Hawaii was constructed with geofoam as lightweight fill (Mimura and Kimura 1995). The
embankment was initially designed to consist entirely of earthfill with geotextile
reinforcement. Site conditions encountered during construction were worse than assumed in
design. Up to 6 m of very soft organic soils were found to overlie soft alluvial soils and
artesian pressures. Conditions encountered at the time of construction further implied
proposed wick drains of up to 24 m lengths would penetrate into artesian formations. The
re-design and construction employed shorter depths of wick drain penetration and 17,000
m3 of EPS geofoam as lightweight fill. The use of geofoam in this project was
effective in reducing settlements and improving safety factors against instability.
Mimura, C.S., and Kimura, S.A., (1995) "A Light-Weight Solution." Geosynthetics
'95, Conference Proceedings, Vol. 1, Nashville, TN, pp.39-51.