An Experimental Study on the Rheological Charasteristics of KIBUSHI Clay

Abstract

Rheological characteristics of a kaolinite clay (KIBUSHI clay) have been studied by a stress-controlled triaxial compression test conducted for six different values of water content ranged from plastic limit to liquid limit of the clay.
An analysis based on a deformation model of Murayama and Shibata leads to the following conclusions:
a) The upper yield value σ_up of the clay is about 75 to 80% of the unconfined compression strength _qu, and the lower yield value σ_low is about 1 to 3% of _qu. They are relatcd to the water content W as
σ_up=σ_0up EXP(-W) and σ_low=σ_0low EXP(-W),
where σ_0up and σ_0low are constant values (kg/cm²) respectively.
b) Two Young's moduli E₁ and E₂ in the deformation model decrease exponentially with water content W. The ratio E₁/E₂, however, decreases linearly with water content W.