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Updated: Jun 9, 2025
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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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Experimental study on the compression and shear deformation evolution of coal pillar dam samples
Yan Wang1, Haoran Liu2, Shuo Feng2
1School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, Shandong, China. wangyantumu@qut.edu.cn.
Scientific Reports
|October 24, 2024
Summary
Water saturation and increased inclination reduce coal pillar dam strength. Deformation patterns, however, remain similar, showing consistent failure mechanisms under varying conditions in underground reservoirs.
Area of Science:
- Geotechnical Engineering
- Mining Engineering
- Solid Mechanics
Background:
- Coal pillar dams are crucial for underground reservoirs in gently inclined coal seams.
- Understanding their mechanical properties and failure patterns is vital for mine safety and stability.
Purpose of the Study:
- To investigate the mechanical properties and deformation failure patterns of coal pillar dams.
- To analyze the influence of saturation and inclination angle on dam performance.
Main Methods:
- Compression-shear coupling tests with variable angles were performed on coal pillar dam samples.
- Digital Image Correlation (DIC) technique was used to capture deformation patterns.
- Numerical simulations validated the experimental findings.
Main Results:
- Load-bearing capacity decreased by 12.8-17.4% under water-saturated conditions.
- Capacity decreased by 3.53% for every 5° increase in inclination angle.
- Both saturation and inclination weakened load-bearing performance but had minor effects on deformation patterns.
Conclusions:
- Water saturation and increased inclination negatively impact coal pillar dam load-bearing capacity.
- Deformation patterns exhibit similarity across different saturation states and inclination angles.
- Findings provide a reference for assessing the stability of coal pillar dams in similar mining environments.
Keywords:
Coal pillar damCompression-shear coupling testDeformation patternsDisplacement field evolutionGently inclined underground reservoirMore Related Videos
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