Cutter Soil Mixing and Jet Grouting For Herbert Hoover Dike Rehabilitation-Video

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Video Summary

The presentation described rehabilitation of the southeast side of Florida’s Herbert Hoover Dyke, including nearly 18 miles of cutoff wall, connections to existing structures, and culvert tie-ins. Bauer installed the cutoff wall using CSM under performance-based requirements for thickness, continuity, strength, and permeability.<br /><br />Organic soils weakened curing, while limestone and cemented sandstone slowed production. The team used replacement-column pretreatment in organic areas and CFA predrilling to break up rock elsewhere. CSM panels were installed fresh-to-fresh. Jet-grouted connections were made near structures, with multiple passes to improve uniformity.<br /><br />Verification included core sampling, borehole imaging, drawdown inspections, permeability tests, and UCS testing. Comparisons showed wet-grab samples and cores had similar average strengths in coarse soils, but cores were weaker in finer, organic-bearing soils—likely due to inclusions, sample preparation, and coring disturbance.<br /><br />The project demonstrated that pretreatment can address challenging ground conditions and that CSM can tie into existing cutoff walls and bentonite-filled structures.

Keywords

Herbert Hoover Dyke

cutoff wall rehabilitation

cement mixing method

ground improvement

jet grouting

organic soils