Abstract:

The model for controlling the earth pressure in the excavation chamber is proposed on basis of numerical simulation by using finite element method. The numerical model for the major boring parameters, the earth pressure in the excavation chamber and the rotation speed of the screw conveyor is established. The control model of the earth pressure balance of the shield machine is proposed with optimization algorithm. The numerical simulation shows that when the thrust speed is constant, the earth pressure can be controlled within the range of the set values by means of real time controlling the rotation speed of the screw conveyo so as to realize the earth pressure balance.

Key words: earth pressure balance, shield machine, control model, excavation chamber, earth pressure