Dry soil mixing was used at the Missouri River Wastewater Treatment Plant to stabilize soft soils to protect against riverbank failure.

The Project

After a riverbank slope failure threatened infrastructure of the wastewater treatment plant along the Missouri River, a cost-effective ground improvement solution was designed. This involved panels of secant soilcrete columns installed through soft, saturated clay/silt to bearing layers to stabilize the riverbank and protect infrastructure.

The Challenge

The dry soil mix operation within a confined work space presented several challenges. Additionally, shortly after production began, previously unknown underground obstructions required adjustments to the operations to achieve successful installation of the dry soil mix columns.

The Solution

A pre-treatment drilling operation was quickly mobilized using both Keller and outside resources to facilitate successful completion of the project. Dry Soil Mixing was used to treat 20 foot wide panels of soil along approximately 1,500 feet of riverbank to improvement depths as great as 70 feet. Using real-time data acquisition, the panels were installed through potential failure planes in the saturated silts and clays down to deeper bearing layers.

Hayward Baker’s internal management, technical expertise, and collaboration with other Keller companies were crucial to the success of this unique and challenging project.

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Project Facts

Owner

City of Omaha

Main Contractor(s)

Bayshore Construction, LLC

Keller Business Unit(s)

Hayward Baker

Engineer

CH2M

Download Project Sheet

Missouri River Wwtp Project Summary