Based on the characteristics of variable loads during the shield machine tunneling in composite strata, a collaborative simulation method was proposed to establish the mechanical control model of the excavation system. Working conditions including the angle of strata, the aperture ratio of the cutter head and the thickness of covering soil were defined to analyze the situation that the shield machine was tunneling in composite strata. The rotating speed of the cutter head was determined by the dynamics model of the mechanical system, and the required driving torque was calculated by the control system model. Through the real-time data exchange between the mechanical system and the control system, the dynamic control of the rotating speed of cutter head was implemented when the resistance moment varied. The established collaborative simulation model of the excavation system has good adaptability to the composite strata, and could provide reference for further study on the design of cutter head with geology adaptability, and also for the optimization of coordination control of the excavation system.
['Yanmin Zhao', 'Jianfu Zhang', 'Pingfa Feng']
Study on Collaborative Simulation of Excavation System of the Shield Machine in Composite Strata