When earth-pressure balance (EPB) shield is used in high permeability ground as well as high groundwater pressure

groundwater will flows through screw conveyor (Flowwing)

this will lead the loss of great quantity of groundwater and even the halt of excavation. Based on the steady-flow seepage theory and shield driving principle

a method for judge Flowing is provided

and a model for study the seepage of groundwater in chamber and screw conveyor is built to explain the mechanism of Flowing. With the model

the parameters such as soil condition

shield geometry

excavation instruction which relate with Flowing are analyzed and the results give some useful conclusions and suggestions to predict and avoid flowing. The model can also be used to calculate the discharge of groundwater.