Monitoring and Analysis of Dynamic Response for Open-Pit Mine with Inside Inclined Shafts under Train Loading
Abstract
:1. Introduction
2. Materials and Methods
2.1. Project Overview
2.2. Field Monitoring
2.3. Numerical Simulation
2.3.1. Calculation Model and Parameters
2.3.2. Application of the Train Load
2.3.3. Distribution of Inclined Shaft Survey Points
3. Results and Discussion
3.1. Monitoring Result
3.2. Model Correctness Verification
3.3. Numerical Calculation Results and Analysis
3.3.1. Slope Stability Analysis
3.3.2. Dynamic Response of East Exhaust Inclined Shaft
3.3.3. Dynamic Response of East Injection Inclined Shaft
4. Conclusions
- The vibration response caused by the full-load trains is significantly greater than the no-load trains. The attenuation speed of the vibration caused by the no-load trains is significantly slower than the full-load trains, which shows that the train load and speed have an impact on the vibration response. Both the horizontal and vertical acceleration eigenvalues decay significantly with the distance of the measuring point;
- Under the action of dynamic load, the maximum displacement of the slope appears in the gravel soil layer, 5 mm, and directly below the train track. The side slope and each soil layer are less than 1 mm soil. The safety factor of the slope under the action of the dynamic load is 1.201.
- The offset of east exhaust and east sand injection inclined shaft caused by train dynamic load is less than 0.1 mm and is far from the dynamic load, and the displacement caused by vibration is negligible;
- The acceleration response law of east exhaust inclined shaft and east sand injection inclined shaft is consistent. Both the horizontal and vertical acceleration reached the maximum at the epidote weak layer, and the acceleration increased significantly directly below the load. The maximum horizontal acceleration of the east exhaust inclined shaft is 6.21 × 10−3 g, with a vertical acceleration of 8.19 × 10−3 g; the horizontal acceleration of the east injection inclined shaft is 6.98 × 10−3 g, with a vertical acceleration of 4.85 × 10−3 g. Overall, the inclined shaft acceleration response caused by the train vibration is small. Therefore, this test has a certain guiding significance for the selection of the through speed and load of trains on open-pit mines with inclined shafts and also provides some reference for the stability of the slopes of open-pit mines under the action of train loads.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Category | Φ (°) | |||||
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Mixed fill | 19 | 22 | 0.3 | 8 | 26 | |
Gravelly soil | 20 | 23 | 0.2 | 10 | 23 | |
Sandstone | 29 | 30 | 0.2 | 38 | 38 | |
Epidote | 20 | 22 | 0.3 | 12 | 7 |
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Wang, Y.; Ni, S.-T.; Yang, F.-W.; Wang, Z.-X.; Zhang, H.; Ma, K.; Li, X.-J. Monitoring and Analysis of Dynamic Response for Open-Pit Mine with Inside Inclined Shafts under Train Loading. Metals 2021, 11, 1681. https://doi.org/10.3390/met11111681
Wang Y, Ni S-T, Yang F-W, Wang Z-X, Zhang H, Ma K, Li X-J. Monitoring and Analysis of Dynamic Response for Open-Pit Mine with Inside Inclined Shafts under Train Loading. Metals. 2021; 11(11):1681. https://doi.org/10.3390/met11111681
Chicago/Turabian StyleWang, Yong, Song-Tao Ni, Fa-Wu Yang, Zhong-Xin Wang, Hong Zhang, Ke Ma, and Xiao-Jun Li. 2021. "Monitoring and Analysis of Dynamic Response for Open-Pit Mine with Inside Inclined Shafts under Train Loading" Metals 11, no. 11: 1681. https://doi.org/10.3390/met11111681