ABSTRACT
The microscopic motion of soil particles which induces the observed macroscopic deformation is considered to consist of the continuous and discontinuous motions. The stress state is evaluated with the normal and tangential components of inter-particle stress shown in Equations in the proposed models. The observed macroscopic deformation of soil specimen is considered microscopically to consist of the continuous and discontinuous motions of soil particles, where the continuous and discontinuous motions respectively mean the change in contact angle and the disappearance and appearance of contact points during deformation process. The continuous motion is evaluated by the change in contact angle at contact points of soil particles, i.e. the change in the probability density function for the contact angle. The microscopic continuous motion of soil particles was explained where the continuous motion is defined as the change in contact angle with the change in stress state.
