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Experimental and Numerical Investigations on Rock Breaking of TBM Disc Cutter Based on a Novel Platform with Rotational Cutting
Abstract Understanding the force state of disc cutters in advance is of great practical significance to predict the dynamic response during mechanical excavation and provide data information for design and arrangement of cutterhead. The sandstone-breaking behaviour of single disc cutter is studied based on the three-dimensional Particle Flow Code (PFC3D) software and rock rotational cutting tests. A novel platform of rotational cutting, which enables circular cutting up to 3.3 m in diameter, is developed to compensate for the shortcoming of existing platforms. The five mechanical and structural parameters (penetration depth, rotational speed, tip width, cutter spacing and installation radius) are changed to investigate the characteristics of cutting force. The numerical simulation reveals that the cutter ring breakage is not only attributed to normal impact, but also caused by side force, which decreases with the growth of installation radius. Meanwhile, the average cutting force and the number of bond breakages increase with the growth of penetration depth and tip width due to the increasing contact area between rocks and disc cutters. It is found that the optimum cutter spacing is 100 mm based on the variation of specific cutting energy. The rotational speed has a weak effect on the cutting force. The trend of average cutting force obtained from the experiment is similar to that of numerical results, and the maximum error does not exceed 15% by comparing the both results. This verifies the accuracy of numerical results.
Highlights A novel rotational cutting platform, which enables circular cutting up to 3.3 m in diameter, is developed.PFC3D software is used to investigate the effects of five operational and structural parameters on sandstone-breaking behavior.The cutter ring breakage caused by the side force is revealed based on the numerical simulation.Providing a reference scheme for the layout of disc cutters and design of shield driving parameters.
Experimental and Numerical Investigations on Rock Breaking of TBM Disc Cutter Based on a Novel Platform with Rotational Cutting
Abstract Understanding the force state of disc cutters in advance is of great practical significance to predict the dynamic response during mechanical excavation and provide data information for design and arrangement of cutterhead. The sandstone-breaking behaviour of single disc cutter is studied based on the three-dimensional Particle Flow Code (PFC3D) software and rock rotational cutting tests. A novel platform of rotational cutting, which enables circular cutting up to 3.3 m in diameter, is developed to compensate for the shortcoming of existing platforms. The five mechanical and structural parameters (penetration depth, rotational speed, tip width, cutter spacing and installation radius) are changed to investigate the characteristics of cutting force. The numerical simulation reveals that the cutter ring breakage is not only attributed to normal impact, but also caused by side force, which decreases with the growth of installation radius. Meanwhile, the average cutting force and the number of bond breakages increase with the growth of penetration depth and tip width due to the increasing contact area between rocks and disc cutters. It is found that the optimum cutter spacing is 100 mm based on the variation of specific cutting energy. The rotational speed has a weak effect on the cutting force. The trend of average cutting force obtained from the experiment is similar to that of numerical results, and the maximum error does not exceed 15% by comparing the both results. This verifies the accuracy of numerical results.
Highlights A novel rotational cutting platform, which enables circular cutting up to 3.3 m in diameter, is developed.PFC3D software is used to investigate the effects of five operational and structural parameters on sandstone-breaking behavior.The cutter ring breakage caused by the side force is revealed based on the numerical simulation.Providing a reference scheme for the layout of disc cutters and design of shield driving parameters.
Experimental and Numerical Investigations on Rock Breaking of TBM Disc Cutter Based on a Novel Platform with Rotational Cutting
Deng, Long-Chuan (author) / Zhang, Fu-Bing (author) / Li, Xiao-Zhao (author) / Zhang, Chi (author) / Ji, Yu-Kun (author) / Wu, Yun (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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