Subaqueous Disposal Area Development and Mitigationby Scott A. Fritzinger, Dep of the Army Philadelphia, District, Philadelphia, United States,
Abstract: Development of subaqueous dikes on soft soils extensively utilized geosynthetics. The design adopted a wide-bermed embankment with high-strength geotextile for tensile reinforcement and strip drains to strengthen the foundation soils. Embankment construction was performed in two stages of granular fill. The first stage involved placing fill hydraulically in segments to tension the high-strength geotextile previously deployed under water. Strip drains were then installed through the wide-berm embankment and geotextile into the foundation soils. Following consolidation of the foundation, the second stage embankment was constructed by controlled fill techniques. Monitoring of instrumentation in the embankment fill, high-strength geotextile and foundation soils assured their performance was in agreement with design assumptions. Mitigation for environmental impacts included deployment and monitoring of artificial reefs and replacement of vegetated wetlands. Credit for the loss of intertidal habitat was given for that portion of the dike subject to tidal inundation.
Subject Headings: Geosynthetics | Foundation design | Fills | Soil stabilization | Drainage | Levees and dikes | Ultimate strength | Soil strength
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