Failure Analysis on the Chordal Eccentric Wear of Disk Cutter in Shield Machine

In the construction project of composite stratum in the Guangzhou subway tunnel, the frequent occurrence of chordal eccentric wear of disk cutters has become a major problem restricting the smooth progress of the project. According to the disk cutter rock breaking mechanism, the wear morphology of t...

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Bibliographic Details
Published in:Journal of failure analysis and prevention 2024-04, Vol.24 (2), p.817-827
Main Authors: Huang, Yuanjun, Hao, Rujiang, Li, Jie, Wang, Han, Guo, Jingbo
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemical composition
Chemical elements
Chemistry and Materials Science
Classical Mechanics
Corrosion and Coatings
Disc cutters
Eccentricity
Excavation
Failure analysis
Maintenance
Materials Science
Mechanical properties
Microstructure
Original Research Article
Parameters
Quality Control
Reliability
Rotating disks
Safety and Risk
Solid Mechanics
Subway tunnels
Tribology
Wear mechanisms
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Summary:In the construction project of composite stratum in the Guangzhou subway tunnel, the frequent occurrence of chordal eccentric wear of disk cutters has become a major problem restricting the smooth progress of the project. According to the disk cutter rock breaking mechanism, the wear morphology of the chordal eccentric wear disk cutter, the mechanical properties of the cutter ring material, the chemical element composition, and the observation of metallographic structure were comprehensively analyzed, and the causes of the chordal eccentric wear of the cutter were determined in combination with maintenance methods. The results of the mechanical property test show that the chemical element composition of the cutter ring material complies with the 4Cr5MoSiV1 steel standard and also has high hardness and good toughness. The metallographic structure is fine and is not prone to brittle fracture and overload. On this basis, combined with the cutter maintenance report, it is determined that the reason for the occurrence of chordal eccentric wear caused by the non-rotation of the disk cutter is the mismatch between the setting of starting torque and the excavation parameters. According to the critical condition for chordal eccentric wear of the cutter, some suggestions are put forward for the adjustment of the tunneling parameters to avoid the occurrence of chordal eccentric wear disk cutter during excavation.
ISSN:1547-7029
1728-5674
1864-1245
DOI:10.1007/s11668-024-01891-0