Abstract：
The self-developed φ800 mm EPB shield model system is composed of a φ800 mm EPB shield, the driving control system, the segment lining structure, and other accessories. This paper presents the detailed description of structure type, layout feature, parameter determination and specific function etc respectively for 5 important components of the shield shell, cutting system, screw conveyor, thrusting system and control panel. By use of the model system, the excavation test in the original soil and similar model test can be carried out according to different requirements, even for approaching construction case under complex conditions. Therefore, for validation of the reliability of model system, the excavation test in original sand stratum is carried out to obtain the ground surface settlement pattern and the development process as well as the relationship between the ground loss ratio and the ground displacement; meanwhile, the ground surface settlement is calculated by Peck formula and compared with the test values, verifying the reliability of this EPB shield model system.
2014, Vol. 51 