Numerical and experimental research on the rock-breaking process of tunnel boring machine normal disc cutters

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• 作者：Geng Qi ; Wei Zhengying ; Meng Hao ; Chen Qiao
• 关键词：face rock tunnel boring machine ; Rock breaking ; User material subroutine ; Rotary cutting machine test
• 刊名：Journal of Mechanical Science and Technology
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：30
• 期：4
• 页码：1733-1745
• 全文大小：9,603 KB
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• 作者单位：Geng Qi (1)
  Wei Zhengying (1)
  Meng Hao (1)
  Chen Qiao (2)
  
  1. State Key Laboratory of Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an, China
  2. State Key Laboratory of Shield Machine and Boring Technology, Zhengzhou, China
  
• 刊物类别：Engineering
• 刊物主题：Mechanical Engineering
  Structural Mechanics
  Control Engineering
  Industrial and Production Engineering
  
• 出版者：The Korean Society of Mechanical Engineers
• ISSN：1976-3824

文摘

A common drawback presented by several numerical rock-breaking studies was that the rocks beneath disc cutters were cut off excessively while the rocks between disc cutters remained, which usually resulted in a smaller cutter spacing than the proper value. To overcome this limitation, the constitutive equations of different rock parts were defined separately using VUMAT, an ABAQUS-based material subroutine. The constitutive model of rock was an application of the Drucker-Prager yield criterion coupled with the Lemaitre damage model. Full-scale rock-breaking tests on a rotary cutting machine were conducted, and 25 groups of orthogonal numerical simulations were carried out. By comparing the normal force, rolling force, and specific energy of numerical results with those of experimental results, the optimal values of the defined parameters D _c1, k, and B were determined to be 9☓10-4, 0.1 and 0.8, respectively. With the presented numerical method and the determined parameters, the influences of cutter spacing on normal force, rolling force, and specific energy were studied. Both the normal and rolling forces of the first cutting generally remained constant, whereas the forces of the second cutting generally increased linearly with the cutter spacing. The optimal cutter spacing for the studied rock type (Hard sand rock collected from West Qinling tunnel) was approximately 72 mm, which was in accordance with the cutter spacing of the tunnel boring machine applied in this tunnel project.