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A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
Published on: June 12, 2019
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On strata damage and stress disturbance induced by coal mining based on physical similarity simulation experiments
Yi Yang1,2, Yingchun Li3, Lujun Wang2
1School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China.
Scientific Reports
|September 19, 2023
Summary
Mining two coal seams sequentially causes significant stress changes in overlying strata. The inter-coal-seam stress peaks after the first seam collapses and then reduces as the second seam is mined.
Area of Science:
- Geotechnical Engineering
- Mining Engineering
- Rock Mechanics
Background:
- Single coal seam mining strata movement is well-studied.
- Overlying strata behavior and stress variations in multiple coal seam mining are not well understood.
Purpose of the Study:
- To investigate the structural characteristics and stress field evolution of overlying strata during multi-seam coal mining.
- To provide insights for disaster prediction and mitigation in similar mining conditions.
Main Methods:
- Physical modeling experiments simulating multi-seam mining.
- Digital Image Correlation (DIC) for visualizing strata movement.
- Pressure cells for monitoring stress field variations.
Main Results:
- Inter-coal-seam strata stress increased significantly after the first seam's collapse and compaction.
- Stress in inter-coal-seam strata decreased during the second seam's mining, reaching zero upon collapse.
- Mining the upper seam exacerbated roof settlement of the lower seam and reduced floor stress.
Conclusions:
- Physical modeling advanced understanding of strata behavior and stress evolution in multi-seam mining.
- Findings offer guidance for managing strata movement and associated risks in underground coal mining.
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