ABSTRACT

In this chapter, deep mixing equipment, construction procedure and quality control methods will be introduced for the representative deep mixing techniques in Japan, which are the dry method of deep mixing, DJM and the wet method of deep mixing, CDM, the high pressure injection mixing, Jet Grouting, and the hybrid of mechanical mixing and high pressure injection mixing. The descriptions in this chapter are based on the latest information as of 2012. As described in Chapter 1, a variety of ground improvement techniques has evolved to cope with changing needs since the deep mixing was developed in the middle of 1970s. The diversified applications of the method (Chapter 4) and the pursuit of cost effectiveness have continuously promoted the improvement of existing execution systems and the development of new systems. Project owners and design engineers are encouraged to update the information periodically.