为探究采用泥水盾构进行海底隧道建设时，海水易从开挖面进入泥水舱并与泥浆混合，导致泥浆泌水率等参数发生变化，进而影响泥膜的性质和开挖面的稳定性问题，配制不同海水添加量的泥浆，测试泥浆的泌水率、黏度和ζ电位等参数变化，并对泥膜的孔隙比、渗透系数等参数进行测试。试验表明： 1）海水的侵入明显增大了泥浆的泌水率，降低了泥浆的黏度和ζ电位。 2）随着海水添加量的增加，泥膜的孔隙比降低，渗透系数由10-9 cm/s增大到10-7 cm/s。 3）导致泥浆泌水率及泥膜渗透系数变化的根本原因是随着海水的添加，泥浆的ζ电位逐渐降低，泥浆颗粒间斥力减弱，宏观上表现为快速沉淀、析水； 同时，由于泥浆颗粒吸引的阳离子增多，结合水膜变薄，形成泥膜的有效孔隙变大，宏观上表现为渗透系数增大。

When submarine tunnels are constructed by slurry shield, the seawater can enter the pressure chamber easily from the excavation surface and mix with the slurry, which would lead to change of the bleeding rate of the slurry, and further affects the properties of the filter cake and the stability of the excavation face. The slurries with different seawater additions are prepared; the bleeding rate, viscosity and zeta potential of the slurry are tested; and the void ratio and permeability coefficient of the filter cake are measured. The results show that: (1) The intrusion of seawater obviously causes the increasing of the bleeding rate and the reduction of the viscosity and zeta potential of the slurry. (2) With the increase of the amount of seawater, the void ratio of the filter cake reduces; and the permeability coefficient increases from 10-9 to 10-7 cm/s. (3) The change of slurry bleeding rate and filter cake permeability coefficient results from addition of seawater causes gradual decrease of zeta potential of the slurry and the repulsive force between the particles; macroscopically, it shows rapid precipitation and bleeding. Meanwhile, due to the increase of cations that slurry particles attract, the hydrated film becomes thinner and the effective porosity of the filter cake increases; macroscopically, the permeability coefficient increases.