New Orleans, LA: Jet Grouting
Geo-Con completed jet grouting for the Army Corp of Engineers New Orleans District as a critical portion of the project to build new flood gates on the Orleans Avenue Canal in New Orleans. The flood gate project included soil mixing in the bed of the canal to stabilize the soil, which was completed by the General Contractor. Geo-Con's jet grouting was done in difficult areas to fill voids in the canal bed where soil mixing could not be completed. These areas were between soil-mix units and steel sheet piles, which were a part of the sill for the new flood gates.
A total of 43 jet grout panels were installed to a depth of 50 feet below sea level. The drill rods had to pass through approximately 12 feet of water in the canal before reaching the canal bed. Geo-Con used cement grout for this project to achieve compressive strength of 140 to 500 psi for the cement-soil mixture in a clay rich soil matrix.
In addition to the significant strength requirement, the major challenge on the project was access. The jet grouting drill rig worked off of a barge in the canal on the protected side of the flood gate structure. On the flood site, Geo-Con worked from a narrow bridge deck approximately 14 feet above the water surface. Additionally, with the canal bed at 12 feet below the water surface, Geo-Con had to set a casing into the soil prior to grouting in order to collect samples of the fresh soil-cement mix (grout return) for confirmation testing.