CONSTITUTIVE EQUATION OF CEMENT TREATED SOILS AND THE NUMERICAL SIMULATION OF SPLITTING TEST

The cement treated soil is going to be applied to prevent the liquefaction or to increase in the bearing capacity of pile. There are four characteristics in the cement treated soil: 1) The strength of the cement treated soil is larger than that of the conventional soil, and is smaller than one of the concrete. 2) The nonlinear behavior can be seen adjacent to the peak strength. 3) After the peak, the softening occurs. 4) The expansion strength is found while the soil is not in general. In this study, subloading surface model introduced by Prof. Hashiguchi is incorporated into Mohr Coulomb Criteria. The undrained triaxial compression tests of cement treated soil were performed under the 0.1 and 0.4 MPa constrained pressure. The parameters were fitted by the result derived by the comparison between experiment and numerical simulation. Using that parameter, the splitting tests were performed. The numerical results showed good agreement with the experiment data about the expansion strength. However, further investigation is required to simulate the splitting test, such as a deformation characteristic. It is assumed as the tasks for the future.