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<p>TBM technology has become a more reliable, versatile and faster method for subterranean excavation compared to drilling and blasting, making it preferable for tunnels exceeding 3 kms. For determining the cutterhead design aspects of TBM, Linear cutting machine tests were often recommended. In this study, six rock blocks were collected from a recently commenced tunnelling project, where a double shield TBM has been deployed to excavate a head race tunnel through metamorphic rocks. These rock samples include quartzitic phyllite, schistose quartzite, slaty quartzite, granitic gneiss, phyllite and quartzite with varied strength and foliations. Linear cutting tests were conducted on these rock blocks to determine cutterhead design and operational parameters. Prior to cutting, rock block characterization was done using P-wave velocity and uniaxial compressive strength test. Using the linear cutting tests normal force, cutting force, specific energy, and rock chip size distributions, were determined at different spacing to penetration ratios. Specific energy consumptions were analysed to determine the optimum spacing to penetration ratio. Image analysis of fragmented chips was also done to assess the size distribution with respect to different cutter spacings and operational variables (thrust) with constant linear speed (720&#xa0;mm/min). Computed TBM design parameters such as spacing, thrust, RPM and torque closely matched with the one deployed. Penetration rate (mm/min) and instantaneous cutting rate (m/hr) were also determined, and the performance of TBM has been predicted. The predicted penetration rate in phyllite and quartzite matched with the actual field performance, validating the cutterhead design and operational methodology for initial performance estimates, confirming the utility for arriving at initial performance estimates.</p>

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Selection of hard rock TBM cutterhead design and operating parameters for a range of metamorphic rock suits in a tunnelling project using laboratory scale linear cutting tests—some investigations

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Biswaraj Dash,
  • V.M.S.R. Murthy,
  • Somnath Chattopadhyaya

摘要

TBM technology has become a more reliable, versatile and faster method for subterranean excavation compared to drilling and blasting, making it preferable for tunnels exceeding 3 kms. For determining the cutterhead design aspects of TBM, Linear cutting machine tests were often recommended. In this study, six rock blocks were collected from a recently commenced tunnelling project, where a double shield TBM has been deployed to excavate a head race tunnel through metamorphic rocks. These rock samples include quartzitic phyllite, schistose quartzite, slaty quartzite, granitic gneiss, phyllite and quartzite with varied strength and foliations. Linear cutting tests were conducted on these rock blocks to determine cutterhead design and operational parameters. Prior to cutting, rock block characterization was done using P-wave velocity and uniaxial compressive strength test. Using the linear cutting tests normal force, cutting force, specific energy, and rock chip size distributions, were determined at different spacing to penetration ratios. Specific energy consumptions were analysed to determine the optimum spacing to penetration ratio. Image analysis of fragmented chips was also done to assess the size distribution with respect to different cutter spacings and operational variables (thrust) with constant linear speed (720 mm/min). Computed TBM design parameters such as spacing, thrust, RPM and torque closely matched with the one deployed. Penetration rate (mm/min) and instantaneous cutting rate (m/hr) were also determined, and the performance of TBM has been predicted. The predicted penetration rate in phyllite and quartzite matched with the actual field performance, validating the cutterhead design and operational methodology for initial performance estimates, confirming the utility for arriving at initial performance estimates.