Abstract
In the ground improved by DEEP MIXING (DM) method up to the bearing stratum, it is expected that the displacement of the improved ground is comparatively smaller so that external forces acting on the DM body are mobilized in the process of horinzontal displacement of the DM body. External forces on the DM body were measured during the construction of reclaimed land. After various investigations on the stability of the DM ground as well as external forces, the following conclusions were derived. (1) The earth pressure in the active side developed to the active earth pressure as a result of small movement of DM body while that in the passive side remained as the earth pressure at rest. (2) The subgrade reaction forces on the base of the DM body found to be equivalent to the analyzed pressure considering the skin friction acting on the DM wall in the active side. (3) From these evidents, it was confirmed that the mobilizing process of external forces should be taken into account. (4) Further, some problems in the current design method were pointed out from this study.
