The artificial cemented soils (lime- or cement-treated soils) is produced when Deep Mixing Method of soil stabilization is applied to soft clayey ground. In the previous and present reports, foundamental properties of the artificial cemented soils are studied experimentally.
　Various factors that affect the strength increase of cement-treated soils are reviewed in comparison with those for lime-treated ones. Tensile strength obtained from split test, σt is roughly proportional to unconfined compressive strength, qu(σt=0.15 qu). From a series of triaxial compression tests, it is observed that i) treated soils show brittle behavior under low confining pressure, ii) treated soils behave as φu=0 material under unconsolidated undrained condition and iii) strain rate effect on the strength is as low as that for natural clays. When shear stresses are applied to high strength treated soil under low effective confining pressure, negative dilatancy tendency is observed. Such a tendency is found neither in heavily overconsolidated clays nor in soft rocks, and is considered to be the characteristics peculiar to the treated soils with large void space.