HARDENING OF SOIL IMPROVED BY DEEP MIXING METHOD. PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON SOIL MECHANICS AND FOUNDATION ENGINEERING, SAN FRANCISCO, 12-16 AUGUST 1985

The deep mixing method (dm method) for strengthening thick deposits of weak sedimentary soil by mixing, in-situ with a strengthening agent is now widely used in Japan. The authors have studied the mechanism which produces this strengthening. The result of their study indicate that adsorption and the pozzolanic reaction in the soil as well as the reaction of the strengthening agent itself, contribute greatly to the increase in strength of the various soils. This provides a uniform basis for explaining the complicated soil strengthening process and explains why the same treatment used in different soils produces a wide variation in results. For the covering abstract of the conference see IRRD 287689. (Author/TRRL)