To build the tunnel project by slurry shield method in a variety of complex environments needs to solve the problem that how to form safe and effective slurry membrane support timely on the excavation surface. The isotropic consolidation curves of the normal consolidation clay in the modified Cambridge model is used to establish the relationship between the membrane solid holdup and the effective stress of slurry membrane. Combining this with the permeability of ideal model of round sphere particle pore and the relationships among the membrane solid holdup

permeability and specific resistance of slurry membrane

a new constitutive model for the formation process of slurry membrane is established. The one-dimensional model is expanded to two-dimensional one

and the incremental analysis method of the formation process of slurry membrane is also given to study the increasing rules. Based on this

the relationship between slurry membrane filtration loss

and factors such as location

time

unit weight ratio and shield diameter are established. The results show that the modified Cambridge model could well characterize the compression consolidation properties of slurry membrane. Under high operating pressure

unit weight of slurry has little effect on membrane growth; but its influence cannot be ignored for super-large diameter shield.