ABSTRACT
M. Shimizu & K. Kageyama Graduate School of Engineering, Tottori University, Japan
ABSTRACT: Unconfined compression tests were performed in a triaxial cell on specimens unsaturated by applying the suction to the slurry of a silt sample. The behavior of the suction during compression is discussed as well as the stress-strain behavior. Experimental results are compared with those predicted based on the ‘effective’ stress by Bishop and on the expression proposed by Fredlund et al. The suction dependency of φb included in Fredlund et al’s equation is considered. Main conclusions are: (1) The suction varies little with the compressive stress lower than a certain level and then decreases with the stress higher than the level, (2) Bishop’s effective stress can explain the average behavior of the shear strength, but not sufficient to explain all the data with one parameter φ′, and (3) Fredlund et al’s equation would be able to explain the strengths if the suction dependence of the parameter φb is properly considered.
