石灰安定処理土の養生初期における力学特性

抄録

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.