Abstract: The stability and deformation control of the excavated side wall is an essential part of the construction quality control of the diaphragm wall. It is an important index of the construction quality control throughout the slurry preparation parameters. Since the mechanism and the role of slurry for the excavated wall stability are not well understood, the empirical method for the concentration of the slurry is still widely used in various projects. The active earth pressure at the excavated wall and the dynamic balance of the pressure of the slurry are illustrated in this paper. The stability criteria of the excavated wall are also presented. The results indicate that, the rate of the diaphragm wall excavation, viscosity of the slurry, depth of the excavation and the internal friction angle of the excavated soil are the factors that might affect the stability of the excavated wall. The potential instability zone is located 10 meters below the ground surface and 3 meters above the bottom of excavation.

Key words: Slurry for Excavated Wall Stability, Excavated Wall Side, Stability Criteria