Abstract
Construction of a 6·62 m (27·7 ft) high bridge approach embankment over weak marsh deposits in Mobile, Alabama was accomplished through the use of geogrid reinforcing and wick drains, resulting in estimated savings of US$600 000. Lightweight polypropylene geogrids and a nonwoven polyester geotextile were used in tandem to permit the construction of a 0·61 m (2 ft) sand blanket across the marsh. The sand blanket served as a working platform for the installation of wick drains which were used to reduce the time required for settlement of the embankment to less than two months. High density polyethylene geogrids were employed to reinforce the embankment so that full embankment height could be constructed without incurring the time delays of stage construction. The advantages of geogrid reinforcement and the construction procedure are discussed.
Published Version
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