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<p>The interaction between the TBM cutters and the rock mass is the main factor in TBM tunneling. The rock damage characteristics under the cutters are directly associated with the cutting efficiency and rock fragmentation mechanism. Four sets of linear cutting tests were performed in this paper with various cutter spacing to obtain the cutter force and muck. Then, fluorescence experiments were conducted to evaluate the rock damage characteristics by sawing the rock samples after the tests. The findings reveal that the effect of cutter spacing on mean normal force increases gradually as penetration depth increases, but only affects mean rolling force for penetration depths exceeding 2.0 mm. The optimal cutting efficiency is achieved at an <i>S/P</i> of 20–60. The area ratio of the crushed zone and the crack dense zone decreases as cutter spacing increases while that of the crack sparse zone increases. Moreover, increasing the cutter force or cutting spacing at the same penetration depth expands the crack sparse zone, increasing the cutting efficiency. This study could provide ideas and data support for designing the TBM cutterhead and optimizing the TBM operation.</p>

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Rock damage characteristics and cutting efficiency with different cutter spacings by linear cutting tests

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Fan Wu,
  • Lijun Yin,
  • Qiuming Gong,
  • You Wu,
  • Chongtong Miao

摘要

The interaction between the TBM cutters and the rock mass is the main factor in TBM tunneling. The rock damage characteristics under the cutters are directly associated with the cutting efficiency and rock fragmentation mechanism. Four sets of linear cutting tests were performed in this paper with various cutter spacing to obtain the cutter force and muck. Then, fluorescence experiments were conducted to evaluate the rock damage characteristics by sawing the rock samples after the tests. The findings reveal that the effect of cutter spacing on mean normal force increases gradually as penetration depth increases, but only affects mean rolling force for penetration depths exceeding 2.0 mm. The optimal cutting efficiency is achieved at an S/P of 20–60. The area ratio of the crushed zone and the crack dense zone decreases as cutter spacing increases while that of the crack sparse zone increases. Moreover, increasing the cutter force or cutting spacing at the same penetration depth expands the crack sparse zone, increasing the cutting efficiency. This study could provide ideas and data support for designing the TBM cutterhead and optimizing the TBM operation.