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- Title
Numerical study of rock-breaking performance of cutters in heterogeneous sand cobble ground.
- Authors
Guo, Jin; Kong, Xiangwei; Cheng, Liu; Li, Xueyi
- Abstract
Further research into tunneling performance in heterogeneous sand cobble ground demands an accurate numerical model of actual formation. In this paper, the ground model composed of spherical sand and ellipsoidal cobble was constructed to study the rock-breaking performance by using the discrete element method. The shape and physical parameters of sand and cobble were obtained on the basis of field test data. Then, the ground model was constructed to simulate the rock-breaking process of the cutterhead. The results show that the center cutter has a high flat wear percentage. With the decrease in cobble content (CC), the cracks between cutters are not connected effectively, thereby resulting in lower rock-breaking quantity. Finally, the influences of CC on the optimal parameters and crack propagation were analyzed. The results indicate that the rock-breaking performance in the ground with a low CC can be improved by increasing penetration and reducing cutter spacing.
- Subjects
DISCRETE element method; SAND; CRACK propagation (Fracture mechanics); PERFORMANCE theory
- Publication
Journal of Mechanical Science & Technology, 2022, Vol 36, Issue 6, p3047
- ISSN
1738-494X
- Publication type
Article
- DOI
10.1007/s12206-022-0535-6