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<p>This study investigates the influence of friction on the lateral and normal components of the rock-breaking force between the cutting face of a Constant Cross-Section (CCS) disc cutter and the rock shear wedge, leveraging the dense core theory. A novel rock-breaking force model is established by coupling the dense core stress field with the contact surface friction force, incorporating the Mohr–Coulomb criterion. Based on a linear correlation assumption, the lateral and normal force models are further modified using the cutter spacing. The proposed model’s predictive capability is then compared against the CSM and Sun models using a comprehensive database of full-scale linear cutting experiments. Results demonstrate that the proposed model exhibits superior prediction accuracy over existing models, particularly for hard rock with an uniaxial compressive strength (UCS ≥ 40). Furthermore, an analysis of key model parameters reveals that variables such as the friction coefficient and cutter thickness are highly sensitive parameters primarily affecting the normal force. This model provides crucial theoretical support for the structural design, wear prediction, and TBM engineering parameter optimization of CCS disc cutters.</p>

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Mechanics Model for Constant Cross Section Disc Cutters Considering Friction Effects

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Yunhao Kang,
  • Tianqi Li,
  • Xuguang Liu,
  • Shuogui Wang

摘要

This study investigates the influence of friction on the lateral and normal components of the rock-breaking force between the cutting face of a Constant Cross-Section (CCS) disc cutter and the rock shear wedge, leveraging the dense core theory. A novel rock-breaking force model is established by coupling the dense core stress field with the contact surface friction force, incorporating the Mohr–Coulomb criterion. Based on a linear correlation assumption, the lateral and normal force models are further modified using the cutter spacing. The proposed model’s predictive capability is then compared against the CSM and Sun models using a comprehensive database of full-scale linear cutting experiments. Results demonstrate that the proposed model exhibits superior prediction accuracy over existing models, particularly for hard rock with an uniaxial compressive strength (UCS ≥ 40). Furthermore, an analysis of key model parameters reveals that variables such as the friction coefficient and cutter thickness are highly sensitive parameters primarily affecting the normal force. This model provides crucial theoretical support for the structural design, wear prediction, and TBM engineering parameter optimization of CCS disc cutters.