Deep SOIL MIXING Columns

As a renowned name in Geostructural Design and Construction, Schnabel is your go-to partner for design-build solutions, best known for being one of the top soil mixing contractors in the country. At our core, we focus on deep soil mixing columns that combine cement grout and soil at the actual project site. It’s a process that not only gives increased strength to the soil but also minimizes its permeability.

Deep soil mixing columns prove instrumental in the construction of impervious earth-supporting structures and steady barriers against groundwater, while also enhancing the load-bearing attributes of the soil. Regardless of the nature of your environment or the complexities of your operational constraints, Schnabel has the proficiency and experience to provide a soil-mixing remedy that matches your unique requirements.

Deep Soil Mixing Column Solutions

Being at the forefront of soil mixing contractors, Schnabel understands the imperative role proper soil mixing plays in developing sturdy earth-retention systems. The process, when effectively performed, results in a soilcrete blend that showcases enhanced strength and diminished permeability.

One possible application for soil mixing is constructing earth-retaining structures when a groundwater cutoff is also necessitated. Schnabel typically employs an approach involving the drilling of overlapping soilcrete columns, thereby creating a consistent groundwater cutoff wall.

To further strengthen the soilcrete, steel piles are generally installed whilst the mixture is fresh and wet. This reinforcement augments the strength of the treated ground, enabling it to bridge the space between the piles. The reduced permeability of a soil mixing wall facilitates excavation under relatively dry conditions, with minimal water table reduction outside the excavation scope.

Soil mixing also has other applications such as the creation of impervious barriers under the ground surface where no excavation is required, for instance, to minimize seepage through a dam or to confine contaminated groundwater. Furthermore, soil mixing proves beneficial in ameliorating foundation soils to boost their strength and decrease the risk of liquefaction during seismic activities.

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soil mixing services

Boston Museum of Fine Arts

Schnabel constructed a cement deep soil mixed (CDSM) wall for the excavation support system at the Boston Museum of Fine Arts in Massachusetts.

soil mixing contractors

Patriots Plaza

Schnabel used several techniques such as deep soil mixing, pressure grouting, and secant piles to provide both excavation support and to impede groundwater flow into the excavation at the Patriots Plaza project in Washington D.C.

Schnabel designed and installed a soil mix wall to support an excavation that was within three feet of the historic Boston Museum of Fine Arts. The low vibrations during installation and increased stiffness of a soil mix wall helped protect the priceless artifacts in the museum. Schnabel worked closely with our client John Moriarty & Associates to ensure project success.

Harry W. Schnabel, P.E., , Boston Museum of Fine Arts Project


Schnabel is the sector’s most operationally efficient Geostructural Design & Construction contractor. We optimize efficiencies by leveraging decades of experience and design/build expertise to innovate processes and approaches that are consistently proven to deliver optimal outcomes for our clients.