ABSTRACT
Over the last 10 years the use of deep soil stabilization with dry mixing of lime-cement has increased in Norway. Especially lime-cement columns located in ribs for slope stabilization have been used on several occasions. The method has proved very cost competitive in comparison to traditional solutions. Unfortunately some failures of lime-cement stabilized slopes have occurred, putting focus on the relevance of the parameters for strength and deformation of both the undisturbed and the stabilized soil. Existing methods for in-situ and laboratory testing are generally related to total strength parameters. A principle for design using effective strength parameters is believed to give a more realistic representation of the real strength of the lime-cement ribs and the interaction with the surrounding soil. The development of a design model based on effective strength is required. The inhomogeneous nature of the stabilized soil thus requires a relatively large amount of data to establish relevant strength and deformation parameters.
