Analysis of the Influence of Surrounding Rock State on Working Performance of Cutting Head in Metal Mining
Abstract
:1. Introduction
2. Materials and Methods
2.1. Boundary Conditions on Rock Mass
2.1.1. Boundary Condition in the Field
2.1.2. Boundary Conditions to Be Studied
2.2. Establishment of Hard Rock Cutting Model
2.2.1. Hard Rock Cutting Model
2.2.2. Material Constitutive Model
3. Results and Discussion
3.1. Stress Distribution on Rock Mass under Different Confining Pressure
3.2. Influence of the Confining Pressure on the Cutting Performance of Cutting Head
3.3. Influence of the Rotating Directions of Cutting Head on the Working Performance
3.3.1. Cutting Force of Shearer Drum
3.3.2. Stress in the Rock Mass
3.4. Influence of Free Surfaces on the Performance of Cutting Head
3.4.1. Free Surface at the Top Side of Rock Mass
- (1)
- For the deformation of rock mass in the y-direction, they can be divided into two parts based on sign: in the regions near the top of the rock mass, the displacement of the rock mass is positive; In other areas, the displacement of the rock mass is negative;
- (2)
- For the deformation of rock mass in the z-direction, the displacement of the rock near the free surface is the highest, while it gradually decreases as it moves away from the free surface at other positions;
- (3)
- The deformation of the rock mass near the rear side is negative, while deformation close to the front side is positive. The reasons for this phenomenon are as follows: (1) The rock mass close to the front side is more prone to deformation due to its proximity to the free surface, and the deformation follows the positive direction of the z-axis. (2) During the cutting process, the end plate of the cutting head would compress the rock mass close to the rear side, causing it to move along the opposite direction of the z-axis. However, due to the fully constrained rear side of the rock mass, the element displacements of the rock mass close to the rear side are smaller than the element displacements of the rock mass close to the front side.
3.4.2. Free Surface at the Rear Side of Rock Mass
- (1)
- There is no constraint applied on the rear side of the rock mass, and the rock mass is deformed along the z-direction due to the compression of the cutting forces of conical picks on the end plate of the cutting head during the cutting process;
- (2)
- The top and bottom sides of the rock mass are fully constrained, which means that even if some cutting forces from conical pick are applied on those regions, no displacement occurs. Therefore, the bulging deformation of the rock mass at the rear side of the rock mass would appear.
3.4.3. Free Surfaces at the Top and Rear Side of Rock Mass
3.4.4. Comparisons of Cutting Force in Conditions of Different Free Surfaces on Rock Mass
4. Conclusions
- (1)
- When the confining pressure on the rock mass is small, the mean cutting force of the cutting head is greater than that without confining pressure; The increase of confining pressure on the rock mass would be helpful to reduce the mean cutting force on cutting head and improve the cutting performance.
- (2)
- During the process of rock cutting, the rotating direction of the shearer drum have influence on the cutting performance of shearer drum. When the cutting head rotates in the clockwise direction, the cutting force is greater than that in the anti-clockwise cutting direction of cutting head.
- (3)
- The cutting force on the shearer drum could be influenced by the unconstrained surface on rock mass. The unconstrained surfaces on rock mass are helpful to reduce the cutting force on the shearer drum. Among the different boundary conditions, the best boundary condition to improve the cutting performance is to create a free surface on rock mass that is close to the end plate of the shearer drum.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Group | Plane A | Plane B | Plane C | Plane D | Plane E | Plane F |
---|---|---|---|---|---|---|
1 | Constrain | Constrain | Constrain | Free | Constrain | Free |
2 | Constrain | Constrain | Constrain | Free | Free | Free |
3 | Free | Constrain | Constrain | Free | Constrain | Free |
4 | Free | Constrain | Constrain | Free | Free | Free |
5–11 | 0.5~10 MPa | Constrain | Constrain | Free | Constrain | Free |
OA1/mm | OA2/mm | OA3/mm | OA4/mm | OA5/mm | OA6/mm |
---|---|---|---|---|---|
470 | 940 | 1410 | 1880 | 2350 | 2820 |
PB1/mm | PB2/mm | PB3/mm | PB4/mm | PB5/mm | |
300 | 600 | 900 | 1200 | 1500 |
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Xu, W.; Wan, L.; Gao, K.; Bu, Y.; Xu, M.; Ma, S.; Jiang, K. Analysis of the Influence of Surrounding Rock State on Working Performance of Cutting Head in Metal Mining. Appl. Sci. 2024, 14, 340. https://doi.org/10.3390/app14010340
Xu W, Wan L, Gao K, Bu Y, Xu M, Ma S, Jiang K. Analysis of the Influence of Surrounding Rock State on Working Performance of Cutting Head in Metal Mining. Applied Sciences. 2024; 14(1):340. https://doi.org/10.3390/app14010340
Chicago/Turabian StyleXu, Weipeng, Lirong Wan, Kuidong Gao, Yu Bu, Meng Xu, Shenghao Ma, and Kao Jiang. 2024. "Analysis of the Influence of Surrounding Rock State on Working Performance of Cutting Head in Metal Mining" Applied Sciences 14, no. 1: 340. https://doi.org/10.3390/app14010340
APA StyleXu, W., Wan, L., Gao, K., Bu, Y., Xu, M., Ma, S., & Jiang, K. (2024). Analysis of the Influence of Surrounding Rock State on Working Performance of Cutting Head in Metal Mining. Applied Sciences, 14(1), 340. https://doi.org/10.3390/app14010340