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GEOTECHNICAL CONSTRUCTION Hydra-Mech Soil Mixing Geo-Con underpinned/stabilized soils under an existing building foundation, using Hydra-Mech. Hydra-Mech is a modified soil improvement technique, developed by Geo-Con, which forms interconnected columns using a large diameter auger in conjunction with high-pressure grout.
The project involved stabilizing approximately 200 lineal feet of soils to depths of 22 feet. The soils consisted primarily of sands and gravels. Geo-Con installed a single row of Hydra-Mech soil mixed columns along the perimeter alignment using a 4-foot diameter auger, which yielded a 6-foot diameter column. A portion of the row was formed directly under the existing footing, due to the high-pressure grout injected during the Hydra-Mech process. A total of 48 columns were mixed to form the stabilized wall.
Once the soil mixing was completed, and the required strength of 250 psi was achieved, the area for the new building addition was excavated to a depth of approximately 17 feet. A pattern of soil nails was installed through the stabilized wall, as required by the design.
Our process was successfully completed with no disruption to the existing active facility. The new building addition was successfully completed under a separate contract.
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