An Elastic-Plastic Constitutive Model of Cement-Stabilized Soil

This paper proposed a damage evolving variable corresponding with a meso-damage constitutive model established on the base of macroscopic and meso-scopic testing on cemented soil in the situation of saturated with water. Untrained triaxial compressive tests were carried out on cemented soil to investigate the effects of confining pressure, fly ash and cement ratio on the strength and stiffness of cemented soil. As the cement content increase, the strength and the initial stiffness of the soil increase. The stress-strain curves are highly dependent on the confining pressure. The experiment results indicate that as the confining pressure increases, the strength and the stiffness of the material increase, whereas, the rate of softening decrease with increasing confining pressure. Failure modes of the material vary from brittle to ductile depending upon the level of cementation and the degree of confinement. Not only initial density of water but also initial damage of cemented soil has influence on damage evolving variable. Compared with experimental curves of cemented-soil, it is shown that the damage constitutive model has in good coincidence with the testing results.