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Longwall panel width design with prediction of the corresponding maximum induced ground surface subsidence
Fariborz Matinpour1, Abbas Majdi2
1School of Mining Engineering, College of Engineering, University of Tehran, Tehran, 1439957131, Iran.
Scientific Reports
|April 9, 2025
Summary
New analytical methods accurately estimate ground surface subsidence caused by longwall mining. These methods help design optimal longwall panel widths, considering factors like coal seam thickness and bulking factors.
Area of Science:
- Mining Engineering
- Geotechnical Engineering
- Earth Sciences
Background:
- Longwall mining is a prevalent underground coal extraction technique.
- Advancing coalfaces create roof fractures that propagate to the surface, potentially causing ground subsidence.
- Subsidence is influenced by the bulking factor of goaf materials.
Purpose of the Study:
- Propose a new equation for the initial fractured bulking factor.
- Develop analytical methods for longwall panel width design.
- Predict maximum induced ground surface subsidence.
Main Methods:
- Developed a new equation for initial fractured bulking factor.
- Introduced two new analytical methods for panel width design and subsidence prediction.
- Conducted sensitivity analysis on key parameters.
- Compared proposed methods with existing ones and verified with in-situ measurements.
Main Results:
- The proposed methods reliably estimate maximum induced ground surface subsidence.
- Sensitivity analysis evaluated the impact of parameters like coal seam thickness, depth of cover, angle of draw, and bulking factors.
- Validation with in-situ data confirmed the accuracy for various panel widths.
Conclusions:
- The developed analytical methods provide a reliable approach for designing longwall panel widths.
- These methods accurately predict the maximum ground surface subsidence induced by longwall mining operations.
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