Lime soil stabilization is widely adopted at construction works such as rail way embankment, subgrade, base course, port and harbor, airport, reclaimed area, recycle of surplus soils etc. When lime-stabilizer and soil are mixed, the ettringite reaction following water absorption and ion exchange reaction is caused within a few days. As a result, needle-shaped crystals, ettringites, make each other’s soil particles link chemically and the soil material is stabilized strongly. In this paper, in order to clarify the mechanical properties of lime-stabilized soil, a series of consolidated undrained compression (CU) tests at different mixture ratio of lime-stabilizer were carried out. The following conclusions are obtained in this study: (1) The shear strength of the lime-stabilized soil increases remarkably and the soil is shown large negative pore water pressure, positive dilatancy, during shear process. (2) Frictional resistance of soil particles of the lime-stabilized soil at the critical state becomes large gradually by increasing mixture ratio of lime-stabilizer. (3) The tendency of strength parameters,
c' and
Φ', of lime-stabilized soil is fluctuant with changes in mixture ratio of lime-stabilizer.
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