ABSTRACT
This chapter is intended to introduce the geotechnical design procedure for ground improved by the deep mixing method. The design procedures are formulated by simplified assumptions or idealization of engineering behavior of the improved ground and involve empiricism to some extent, backed up by successful case histories. The simplification/idealization and empiricism are based on the abundant research and experience accumulated by the Japanese mechanical deep mixing system employing vertical rotary shafts and mixing blades such as CDM and DJM. However, the design procedures described in the chapter may be applicable to similar in-situ admixture stabilization including high pressure injection deep mixing if adequate considerations are paid for such characteristics as relation between the strengths of in-situ stabilized soil and laboratory prepared stabilized soil, variability of in-situ stabilized soil, reliability of overlap joint and end bearing.
