1 School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China
2 State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
3 CCCC Second Harbor Engineering Co., Ltd., Wuhan 430040, China
The rock-breaking efficiency of disc cutters is significantly influenced by complex geological conditions and mechanical parameters in tunnel excavation using tunnel boring machines (TBM). The accurate prediction of this efficiency under varying geological conditions is imperative for TBM. A prediction method was proposed for the rock-breaking efficiency of TBM disc cutters in jointed rock masses through the integration of a support vector machine (SVM) with intelligent optimization algorithms. Specifically, particle swarm optimization (PSO), moth-flame optimization (MFO), and black-winged kite algorithm (BKA) were utilized to optimize the penalty factor and kernel function parameters of the SVM. Seven parameters, including confining pressure, joint spacing, joint dip angle, rock strength, penetration depth, cutterhead thrust, and rolling force were selected as inputs and specific energy was defined as output for the prediction model. A dataset was constructed based on full-scale linear cutting tests and discrete element numerical simulations for model training and testing. The results show that the BKA-SVM model demonstrates superior performance in terms of stability, computational efficiency, and prediction accuracy when compared to the PSO-SVM and MFO-SVM models. Furthermore, the sensitivity analysis of the predicted data reveals that rock strength and penetration depth are the most influential factors, with an optimal penetration depth for rock breaking identified as 3 mm. Additionally, a positive correlation has been observed between rock strength and specific energy, with a more pronounced increasing trend. The research results provide valuable insights for the optimization of rock-breaking efficiency during TBM excavation with potential applications for enhancing operational efficiency and reducing energy consumption.
FAN Ying, TAO Wei-long, LIU Bin, LIU Xue-wei, HUANG Xing, LIU Peng-fei.
Prediction Method of Rock Breaking Efficiency of Disc Cutters Based on Hybrid Intelligent Optimization Algorithm[J].
Science Technology and Engineering, 2026, 26(8): 3506-3522 DOI:10.12404/j.issn.1671-1815.2504144
所提出的BKA-SVM模型为预测比能提供了重要的分析手段,尽管模型能够精准识别各影响因素,但各因素对比能预测的重要性仍需深入探讨。为了准确预测破岩比能, 降低滚刀破岩施工的高成本和风险,综合考虑比较了7个输入参数在预测比能过程中的重要性。将测试集的数据进行统计并采用Verron等[41]提出的互信息检验方法(mutual information test, MIT)用于分析输入参数对模型输出的影响。MIT是一种过滤方法,可用于捕获每个参数与标签之间的任意关系(包括线性和非线性)。它是变量之间相互依赖的度量,表明变量之间关系的强度。变量之间MI的大小可以用信息Gain表示。
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