Based on the engineering challenge of dynamic stability control for shield propulsion systems under complex geological conditions, this study aims to address two critical issues: adaptive optimization of nonuniform configurations during multi-ring continuous tunneling and long-term stability evaluation. By establishing a segmented progressive reconfiguration mechanism with the core constraint of minimizing phase angle adjustment quantities between adjacent configurations, analytical optimization algorithms achieve rapid and energy-efficient switching of nonuniform layouts. Simultaneously, this work innovatively proposes the Thrust Stability Coefficient (TSC). A quantitative dynamic stability evaluation model is developed by coupling the discrete characteristics of thrust variation coefficients with their mean levels. Numerical simulations and field validation demonstrate: The nonuniform thrust system reduces TSC values by 85%, while the overall TSC at the Duesseldorf WHL Metro Project in Germany is further reduced by 70% during continuous construction. Adams virtual prototype simulations validate the effectiveness of TSC in characterizing the stability of chained nonuniform configurations. The theoretical framework of “dynamic reconfiguration optimization—global stability evaluation—long-term safety control” established in this research not only provides innovative solutions for shield propulsion systems under complex geological conditions, but also delivers critical technical support through its engineering data-driven verification methodology and chain optimization strategy for the stability control of intelligent tunneling equipment in underground engineering.
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