IHNC Lake Borgne Surge Barrier New Orleans, LA Back to Project List Jet Grouting Closure piles are installed in jet grouted columns to seal the interstitial space between cylinder piles. Project Overview: Layne GeoConstruction played an integral role in the construction of the largest design-build civil works project ever awarded by the US Army Corps of Engineers. The 1.5 mile long surge barrier project allows the Corps to achieve a 100-year level of risk reduction in 2011 for some of the Gulf Coast’s most vulnerable areas. Using state-of-the-art bi-jet grouting equipment and techniques, LGC installed 2,540 3-foot diameter jet grout columns to depths of up to 105 ft for in-situ treatment of stiff clays and sand fill found throughout the project alignment using single fluid jet grouting technology. Over 550,000 cubic feet of soils were treated reaching strengths averaging >500 psi providing support for 18-inch closure piles, which were installed in each of the jet grouted plumes. The closure pile subsystem provides a means of sealing the interstitial space between cylinder piles throughout the water column; and together with the jet-grouted soilcrete, provides a means of mitigating potential seepage and scour below the mud line.     Value of Work Performed: $ 24,000,000 Project Duration: 10 months Project Completion Date: March 2010 Project Reference: Project Owner: US Army Corps of Engineers New Orleans District General Contractor: Traylor-Massman-Weeks, LLC Construction Manager: Shaw E & I Engineer of Record: Ben C. Gerwick / INCA