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中文核心期刊

TBM不均匀磨损盘形滚刀破岩力研究

STUDY ON THE NON-COOPERATIVENESS OF ROCK BREAKING BY TBM DISC CUTTERS WITH UNEVEN WEAR

  • 摘要: 全断面岩石掘进机(full face rock tunnel boring machine,TBM)盘形滚刀破岩力研究一直是领域研究热点, 但目前对盘形滚刀破岩力研究多以室内切割试验和数值模拟为主, 相应的研究成果多为经验模型, 难以全面反映实际工程中滚刀不均匀磨损对破岩力的影响. 据此, 基于塑性力学理论结合数值模拟与理论分析, 揭示了盘形滚刀作用下岩石的“塑-脆”特性, 推导并建立了磨损盘形滚刀破岩法向力与滚动力理论方程, 经验证误差小于4%. 通过ABAQUS软件建立了不均匀磨损盘形滚刀破岩数值模型, 对比研究了不均匀磨损盘形滚刀破岩力和破岩比能, 首次将不均匀磨损盘形滚刀破岩过程划分为可接受、过渡和不可接受非协同破岩3个阶段. 建立了不同安装半径下不均匀磨损盘形滚刀破岩比能预测理论, 经验证最大误差为6.5%, 并首次定义了衡量破岩非协同性程度的不均匀磨损盘形滚刀破岩性能指标\eta . 研究结果表明, 不均匀磨损盘形滚刀破岩力随磨损量增加而增大, 破岩比能随磨损量和安装半径增加而增大, 且具有明显区间效应. 论文研究为TBM作业刀具更换和不均匀磨损盘形滚刀破岩力和比能预测提供了有益参考和借鉴.

     

    Abstract: The disc cutter rock-breaking force of Full Face Rock Tunnel Boring Machines (TBMs) has long been a key topic in tunneling mechanics. However, current studies mainly focus on laboratory cutting tests and numerical simulations, resulting in predominantly empirical models that are insufficient to accurately reflect the influence of uneven cutter wear on rock-breaking forces in practical engineering. In this study, based on plasticity theory, a combined approach of numerical simulation and theoretical analysis is employed to reveal the “plastic–brittle” behavior of rock under disc cutter action. Theoretical formulations for the normal force and rolling force of worn disc cutters are derived, with a maximum validation error less than 4%. A numerical model of rock cutting with unevenly worn disc cutters is established using ABAQUS, enabling a comparative investigation of rock-breaking forces and specific energy. The cutting process under uneven wear is, for the first time, classified into three stages: acceptable, transitional, and unacceptable non-synergistic cutting. A predictive model for specific energy under different installation radii is developed, with a maximum error of 6.5%. Furthermore, a performance index \eta is proposed to quantify the degree of non-synergism in rock breaking induced by uneven wear. The results show that rock-breaking forces increase with wear amount, while the specific energy increases with both wear and installation radius, exhibiting distinct interval characteristics. This study provides theoretical support and practical reference for cutter replacement decisions and the prediction of rock-breaking performance under uneven wear conditions in TBM operations.

     

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