Scholarlink

<p>In view of the frequent fracture of shield disk cutter rings in composite strata, the failure causes and fracture mechanisms of the cutter rings were systematically investigated based on field cutter replacement records, time series tunneling parameter data, a dynamic numerical rock-breaking model of the disk cutter, and multi-scale characterization methods. The results indicate that the mixture of soft and hard rock in composite strata markedly increases both the magnitude and fluctuation of disk cutter loads, while pronounced contact stress concentration tends to develop in the transition zone, thereby promoting crack initiation at the cutter edge. The coarse, segregated primary carbides in the D1 cutter ring and the S-rich and O-rich inclusions in the D2 cutter ring substantially reduced the impact toughness of the cutter ring material, thereby promoting brittle fracture under impact loading. The fracture predominantly occurs in the form of cleavage and quasi-cleavage. Cutter ring fracture results from the combined effect of impact loading in composite strata and intrinsic microstructural imperfections within the cutter ring material. These findings provide a basis for optimizing cutter ring materials and adjusting tunneling parameters.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Fracture Analysis of Disc Cutter Rings in Shield Machines under Composite Strata

  • 期刊论文

  • 发表日期：

    2026年7月3日

查看全文
  • Mengze Han,
  • Yongsheng Liu,
  • Gaoming Lu,
  • Qianqian Lv,
  • Jingbo Guo,
  • Yandong Yang,
  • Chaoyin Liu,
  • Ziwen Xu,
  • Jingkai Li

摘要

In view of the frequent fracture of shield disk cutter rings in composite strata, the failure causes and fracture mechanisms of the cutter rings were systematically investigated based on field cutter replacement records, time series tunneling parameter data, a dynamic numerical rock-breaking model of the disk cutter, and multi-scale characterization methods. The results indicate that the mixture of soft and hard rock in composite strata markedly increases both the magnitude and fluctuation of disk cutter loads, while pronounced contact stress concentration tends to develop in the transition zone, thereby promoting crack initiation at the cutter edge. The coarse, segregated primary carbides in the D1 cutter ring and the S-rich and O-rich inclusions in the D2 cutter ring substantially reduced the impact toughness of the cutter ring material, thereby promoting brittle fracture under impact loading. The fracture predominantly occurs in the form of cleavage and quasi-cleavage. Cutter ring fracture results from the combined effect of impact loading in composite strata and intrinsic microstructural imperfections within the cutter ring material. These findings provide a basis for optimizing cutter ring materials and adjusting tunneling parameters.