To avoid abnormal attitude problems such as serpentine and axis deviation during shield tunneling affecting construction safety,a large-diameter slurry shield attitude control method combining CatBoost algorithm and MOEAD.A shield posture prediction model was developed with 19 input parameters and 6 output parameters,and the CatBoost algorithm was used to develop a nonlinear mapping relationship between input and output parameters.The SHAP was used to analyze the effects of input parameters on shield posture.The CatBoost-MOEAD shield posture multi-objective optimization model was coupled with the multi-objective optimization algorithm.Then the proposed model performance was validated against the Wuhan Yangtze River large-diameter slurry shield tunnel project.The results showed that the CatBoost prediction model can efficiently predict the posture of large-diameter mud-water shields.The determination coefficients of the six shield posture objectives ranged from 0.931 to 0.974,the root-mean-square errors ranged from 0.030 to 0.880,and the errors ranged from 0.039 to 1.057.The thrust of the propulsion group has the most significant impact on shield attitude among the major construction parameters.The proposed CatBoost-MOEAD multi-objective optimization method for shield attitude had a great performance in optimization effect with a maximum value of 38.86％.
维普
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