Jet Grouting For Soil Improvement

Recognized as a leading force in the American design-build sector, Schnabel excels in offering innovative jet grouting services tailored for soil improvement. This specialized technique is pivotal for clients facing unique construction challenges, aiming to enhance soil properties to meet their project requirements.

Jet grouting, a cornerstone in soil improvement, is instrumental in reducing groundwater interference in subterranean projects. It’s also effective for strengthening the foundations of existing buildings and providing critical support during excavations.

As a distinguished jet grouting provider in the U.S., Schnabel is adept at transforming weak soil into cement-stabilized structures, essential for groundwater management and foundational integrity.

With a rich history in the field, Schnabel brings unparalleled expertise in jet grouting for soil improvement, ensuring clients successfully navigate through complex site conditions and achieve their construction ambitions. Contact us today!


Jet grouting, integral to soil improvement, involves an in-situ process of blending soil with injected cement grout to create stabilized soil columns. This modified soil, characterized by enhanced strength and reduced permeability, serves as an engineered solution for robust foundation support and effective groundwater control. Typical applications include underpinning existing structures and forming cutoff walls for excavation stability.

The process begins by drilling a small-diameter pipe (around 4 inches) to the target depth. High-pressure cement grout, typically around 6,000 psi, is then injected through the drill pipe as it rotates and ascends, forming a circular column of improved soil. The diameter of these columns can be adjusted by varying the withdrawal rate, allowing for tailored support. Positioned strategically, these columns can be used for vertical reinforcement or combined to form barriers against soil and water migration.

Jet grouting’s adaptability is particularly beneficial in sites with subsurface obstacles like utilities, as its narrow drilling approach allows for intervention in constrained spaces. This method effectively creates expansive soil columns beneath these obstacles, offering a solution not achievable with traditional soil improvement techniques. Jet grouting’s precision and versatility make it a preferred choice for complex underground conditions.


Children’s Hospital in Minneapolis

Schnabel used jet grout columns as underpinning and excavation support for the construction of an addition to the Children’s Hospital in Minneapolis, Minnesota. The jet grout columns eliminated the need for timber lagging and prevented the loss of sand during the 21-foot-deep excavation.

J Avenue Water Treatment Plant

Schnabel installed 67 jet grout columns to support the expansion of the J Avenue water treatment plant in Cedar Rapids, Iowa. This project required an excavation adjacent to an existing structure. The continuous wall of jet grout columns was successful in retaining the soil and water behind the wall and no measurable settlement of the tank structure occurred.

The Minneapolis Children’s Hospital project was Schnabel’s first application of jet grouting to underpin an existing structure in lieu of traditional hand-dug underpinning pits. The project team was very pleased with the performance of the jet grout underpinning system.

Chuck Conlon, P.E., Children's Hospital of Minneapolis


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.