摘要：In order to improve the strength and stiffness of shield cutterhead, the method of fuzzy mathematics theory in co.bination with the finite element analysis is adopted. An optimal design model of structural parameters for shield cutterhead is formulated,based on the co.plex engineering technical requirements. In the model, as the objective function of the model is a co.posite function of the strength and stiffness, the response surface method is applied to formulate the approximate function of objective function in order to reduce the solution scale of optimal problem. A multi-objective genetic algorithm is used to solve the cutterhead structure design problem and the change rule of the stress-strain with various structural parameters as well as their optimal values were researched under specific geological co.ditions. The results show that co.pared with original cutterhead structure scheme, the obtained optimal scheme of the cutterhead structure can greatly improve the strength and stiffness of the cutterhead, which can be seen from the reduction of its maximum equivalent stress by 21.2%, that of its maximum deformation by 0.75%, and that of its mass by 1.04%.

摘要：EPB TBMs(Earth pressure balance Tunneling Boring Machines) are extensively used in tunneling constructions because of its high efficiency and low disturbance on structures above ground. It is critically significant to predict the thrust acting on TBMs under different geological co.ditions for both the design of power system and the co.trol of tunneling process. The interaction between the cutterhead and the ground is the co.e of excavation, through which geological co.ditions determine the thrust re-quirement co.bined with operating status and structural characteristics. This paper co.ducted a mechanical deco.pling analysis to obtain a basic expression of the cutterhead-ground interactive stress. Then more engineering factors(such as cutterhead topological structure, underground overburden, thrusts on other parts, etc.) were further co.sidered to establish a predicting model for the total thrust acting on a machine during tunneling. co.bined with three subway projects under different geological co.ditions in china, the model was verified and used to analyze how geological, operating and structural parameters influence the acting thrust.