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Assessing support alternatives for longwall gateroads subject to changing stress
Gabriel S Esterhuizen1, I Berk Tulu2, Dave F Gearhart1
1National Institute for Occupational Safety and Health, Pittsburgh Mining Research Division, Pittsburgh, PA 15236, USA.
International Journal of Mining Science and Technology
|May 19, 2023
Summary
This study quantifies how longwall mining stress affects gateroad stability. It provides regression equations to estimate roof deformation and assess support systems for safer mining operations.
Area of Science:
- Mining Engineering
- Geotechnical Engineering
- Rock Mechanics
Background:
- Longwall gateroad entries experience stress changes from panel extraction, causing ground deformation like roof sag, rib dilation, and floor heave.
- Mine operators use various supports to manage ground response and ensure safe access and ventilation for longwall operations.
Purpose of the Study:
- To quantify the impact of longwall-induced stress changes on ground stability.
- To develop a method for assessing the effectiveness of different support alternatives.
- To improve the design and planning of longwall operations for enhanced safety and efficiency.
Main Methods:
- Monitoring ground and support interaction at operational U.S. longwall mines.
- Analyzing and calibrating numerical models for bedded rock mass behavior.
- Investigating the influence of geology, stress conditions, depth of cover, and geologic scenarios on ground deformation and support response using calibrated models.
Main Results:
- Developed two regression equations to estimate roof deformation and the height of roof yield caused by longwall-induced stress changes.
- Validated the method through a retrospective analysis of a headgate roof fall incident.
- Demonstrated the method's capability to provide realistic estimates of gateroad entry stability and support performance.
Conclusions:
- The developed method accurately estimates gateroad entry stability and support performance under longwall-induced stress.
- This approach enables the assessment of alternative support systems during the design and planning phases of longwall operations.
- The research contributes to safer and more efficient longwall mining by improving ground control strategies.
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