Geo-Con, Inc.

In-situ stabilization using Shallow Soil Mixing and Deep Soil Mixing

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Courtesy of Courtesy of Geo-Con, Inc.

Of the currently emerging technologies for site remediation, one of the most attractive and economical is in-situ stabilization and/or in-situ fixation of contaminated soils by Shallow Soil Mixing (SSM) or Deep Soil Mixing (DSM). Actually, the soil mixing process is not new. It has been in use as a geotechnical construction process for over two decades. However, its use as a treatment for hazardous waste is a recent development

Although the process of soil mixing originated in the United States in the 1950s (1), its major development occurred over the last twenty years in Japan. Several Japanese companies have developed different types of soil mixing methods and built large geotechnical construction divisions of their businesses based on the use of these processes. To date, there have been thousands of projects performed in Japan using some form of soil mixing. However, the first use for environmental cleanups was in the United States.
Soil mixing for in-situ stabilization of contaminated soils offers a methodology which allows soils to be treated above and below the water table without removal. There is no environmental impact and no special preparation required.

Soil mixing is divided into two categories, Shallow /soil Mixing (SSM) and Deep Soil Mixing (DSM). The SSM system utilizes a crane mounted mixing system. The mixing auger, three feet to twelve feet (1 meter to 3.7 meters) in diameter, is driven by a high torque turntable. /The mixing head can be enclosed in a bottom-opened cylinder, as depicted in Figure 1. to allow for closed system mixing of the waste and treatment chemicals.

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