China Safety Science Journal ›› 2024, Vol. 34 ›› Issue (8): 69-77.doi: 10.16265/j.cnki.issn1003-3033.2024.08.1360

• Safety engineering technology • Previous Articles     Next Articles

Shield attitude prediction and optimization based on CatBoost-NSGA-III algorithm

WU Xianguo1(), LIU Jun1, CAO Yuan1, LEI Yu1,**(), LI Shifan1, QIN Yawei1,2   

  1. 1 School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology,Wuhan Hubei 430074, China
    2 Wuhan Huazhong University of Science and Technology Test Technology Co., Ltd., Wuhan Hubei 430074, China
  • Received:2024-02-21 Revised:2024-05-28 Online:2024-08-28 Published:2025-02-28
  • Contact: LEI Yu

Abstract:

To solve the problems such as forward tilt deformation, serpentine shape, axis deviation and correction during shield tunneling, which affected the safety and efficiency of shield construction, a multi-objective optimization method of shield attitude combining CatBoost and NSGA-Ⅲ was proposed. Taking Guiyang Metro as the background, 22 influencing factors were selected as input parameters, and the nonlinear mapping function relationship between input parameters and shield attitude was established by using CatBoost algorithm. The importance of input parameters was evaluated by random forest (RF) algorithm. A CatBoost-NSGA-Ⅲ multi-objective optimization model was established to minimize the absolute value of the shield attitude, and the applicability and effectiveness of the proposed method were verified by a case study. The results show that the prediction model obtained by using CatBoost algorithm to train engineering measured data has high accuracy, and the R2 range of 5 shield attitude targets is 0.916-0.943. By using the CatBoost-NSGA-Ⅲ multi-objective optimization method, the attitude of the shield can be optimized significantly, and the average value of the overall improvement is 53.34%.

Key words: categorical boosting (CatBoost), non-dominated sorting genetic algorithm-Ⅲ (NSGA-Ⅲ), shield attitude, multi-objective optimization, importance ranking

CLC Number: