硬岩掘进机刀盘载荷与撑靴接触界面刚度的耦合关系

在复合地质条件掘进时刀盘载荷与撑靴接触界面的耦合关系严重影响硬岩掘进机(TBM)动态特性.基于并联机构理论研究TBM推进系统的力传递特性,建立刀盘、机械系统和撑靴接触刚度耦合力传递模型,讨论了刀盘在复合地质条件下掘进时刀盘载荷波动与撑靴岩石接触界面刚度之间的耦合关系.结果表明,撑靴接触界面刚度随刀盘载荷增大而非线性增大;复合地层中,刀盘载荷波动,接触界面刚度也呈现相应的波动特性;两侧撑靴接触界面岩石软硬不同时,刀盘载荷均值和波动增加,接触界面刚度均值和波动加大,且较硬一侧增加幅度大于较软一侧减小幅度.

Coupling Relationship Between Loads on Cutterhead of Tunnel Boring Machine and Contact Stiffness of Gripper Shoes and Rocks

Abstract： The variation of cutting depth of the rolling cutter causes fluctuations of loads on the cutterhead. The variable loads result in fluctuation of stiffness after being transmitted to the contact surface between gripper and rocks, change the position and posture of the tunnel boring machine(TBM), and influence the loads on the cutterhead. The coupling of the loads and stiffness greatly influences the dynamic behaviors of TBM. Considering the fluctuation of loads on the cutterhead, the transmission of forces was analyzed using the parallel mechanism theory and the coupling of loads on the cutterhead. Besides, the stiffness on the surface between gripper shoes and rocks was studied. The results show that the stiffness on the contact surface increases with the enlargement of loads on the cutterhead. In mixed stratums, the stiffness fluctuates with the fluctuation of loads on the cutterhead. When the rocks at both sides are different, the average values and fluctuations of load on the cutterhead and stiffness of the contact surface increase compared with those of the same rocks at both sides, and the increase of stiffness on the hard contact surface is greater than the decrease on the soft contact surface.