ABSTRACT

The Deep Mixing Method, an in-situ soil stabilization technique using cement and/or lime, is often applied to improve soft soils (CDIT 2002). The group column type improvement is extensively applied to stabilize foundations of embankment or lightweight structures. The Japanese current design method, established for reinforcing embankment (PWRC 2004), assumes two failure patterns related to external and internal stabilities. For internal stability, the possibility of rupture breaking failure is evaluated by slip circle analysis, assuming the shear failure mode of DM columns.