ABSTRACT

Equilibrium differential equations of a soil, serving as the foundation for the theoretical system of soil mechanics, are the basis to study stress, strength and deformation of the soil. These equations include the equilibrium equation of soil mass and each phase of the soil, the soil skeleton, pore water and pore air. The stress of soil mass is called the total stress of the soil. The total stress equilibrium equations of soil mass can be obtained by equilibrium analysis of the internal forces on the free body of soil mass. The former portion is called the adsorbed micro air bubbles. The micro water air bubbles affect the density and compressibility of pore water while the adsorbed air bubbles influence the stress and deformation of the soil skeleton. The micro bubbles adsorbed to the surfaces of soil particles or micro soil clusters are generally steady. Therefore, the micro bubbles can be combined with pore water to conduct internal equilibrium analysis.