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<p>To address the problem of inefficient rock fragmentation in roller cutters used for shaft excavation in the Jurassic formations of western China, this study examined the dry and water-saturated Jurassic rocks through penetration tests conducted under various dual-tooth configurations using a cooperative rock fragmentation experimental platform. The failure modes and load–penetration curve characteristics of both rock types were analyzed. The penetration resistance coefficient and specific energy were used to identify the optimal dual-tooth arrangement under each condition. In addition, numerical simulations based on FDEM were performed to model penetration and crack propagation in both dry and water-saturated rocks under different dual cutter teeth configurations. The critical penetration depth required for cooperative rock fragmentation with dual cutter teeth and the crack distribution patterns in both rock types were determined. The results indicated that a horizontal dual cutter teeth configuration with a 15&#xa0;mm spacing provided the highest rock fragmentation efficiency for both dry and water-saturated rocks. Under these conditions, the minimum critical penetration depths for dry and water-saturated rocks were 4 and 6&#xa0;mm, respectively. Shear failure predominated in both cases, with average shear crack proportions of 88% and 82%, respectively. This study identified an optimal tooth spacing of 15&#xa0;mm and the corresponding critical penetration depth for cooperative rock fragmentation, providing a theoretical basis for enhancing the performance of roller cutters in shaft sinking operations conducted by drilling in the Jurassic rocks of western China.</p>

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Optimal dual cutter teeth arrangement and crack propagation mechanisms for shaft sinking rock-breaking in the Jurassic strata of Western China

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Xiaoyun Wang,
  • Hua Cheng,
  • Zhishu Yao,
  • Yiyang Wang,
  • Jiaqi Wang,
  • Fangyu Hu

摘要

To address the problem of inefficient rock fragmentation in roller cutters used for shaft excavation in the Jurassic formations of western China, this study examined the dry and water-saturated Jurassic rocks through penetration tests conducted under various dual-tooth configurations using a cooperative rock fragmentation experimental platform. The failure modes and load–penetration curve characteristics of both rock types were analyzed. The penetration resistance coefficient and specific energy were used to identify the optimal dual-tooth arrangement under each condition. In addition, numerical simulations based on FDEM were performed to model penetration and crack propagation in both dry and water-saturated rocks under different dual cutter teeth configurations. The critical penetration depth required for cooperative rock fragmentation with dual cutter teeth and the crack distribution patterns in both rock types were determined. The results indicated that a horizontal dual cutter teeth configuration with a 15 mm spacing provided the highest rock fragmentation efficiency for both dry and water-saturated rocks. Under these conditions, the minimum critical penetration depths for dry and water-saturated rocks were 4 and 6 mm, respectively. Shear failure predominated in both cases, with average shear crack proportions of 88% and 82%, respectively. This study identified an optimal tooth spacing of 15 mm and the corresponding critical penetration depth for cooperative rock fragmentation, providing a theoretical basis for enhancing the performance of roller cutters in shaft sinking operations conducted by drilling in the Jurassic rocks of western China.