Slurry Wall Design Techniques and Construction Practices Over the Last 50 Years in Northeastern United States-PPT Presentation

PPT Presentation

Pdf Summary

The presentation reviews 50 years of slurry wall design and construction practices in the northeastern United States.<br /><br />Design has evolved alongside analytical tools, from slide rules and hand calculators to structural and soil–structure interaction software. Two principal analysis methods are discussed: limit equilibrium and finite element analysis (FEA). Limit equilibrium design examines pressure distributions and support conditions through successive excavation stages, emphasizing the importance of staging and assumed wall support points. FEA can model how the wall, bracing system, and excavation sequence affect wall movements and adjacent structures. Comparisons of the methods consider brace loads and wall moments for walls supported by either preloaded internal braces or tieback anchors. The presentation also notes the transition from working-stress design toward ultimate-strength methods.<br /><br />Construction techniques have progressed from cable-suspended mechanical clamshells, with chisels used to penetrate obstructions, to hydraulic clamshell systems and hydromills (hydrofraises). Panel joint options include wide-flange beam end stops, continuous waterstop joints, and overbite construction joints. Reinforcement work involves cage fabrication, tilt tables, and rigging.<br /><br />Quality assurance is central to successful construction. Recommended practices include reviewing submittals; maintaining detailed daily records; regularly testing slurry properties; documenting excavation methods, materials, slurry levels, and wall verticality; and checking panel bottoms. Reinforcing cages require inspection, particularly to ensure adequate bar spacing for concrete placement. Accurate elevation surveys, concrete sampling and testing, observation of concrete placement, and monitoring tremie-pipe embedment are also emphasized.

Keywords

slurry wall

design practices

construction methods

finite element analysis

limit equilibrium

excavation staging

bracing systems

tieback anchors

quality assurance

tremie concrete