ABSTRACT
The dry jet mixing (DJM) method is often used to improve peaty soft ground in Hokkaido, Japan. The quality of improved columns which are formed using this method seems to depend on mixing efficiency. Test construction to check mixing efficiency was conducted in peaty soft ground. The rotation speed of mixing blades, penetration speed of the injection component, quantity of stabilizer -- all of which are likely to be related to mixing efficiency -- were varied in this test condition.
Finally it revealed that the numbers of mixing by blade rotation has an influence on the quality of improved columns. Suitable numbers of mixing per meter in depth were estimated for peaty soft ground in this study.
