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Mechanical Behavior and Permeability Evolution of Coal under Different Mining-Induced Stress Conditions and Gas Pressures

Author

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  • Zetian Zhang

    (State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, China Energy Investment Co. LTD, Beijing 100011, China
    MOE Key Laboratory of Deep Earth Science and Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China)

  • Ru Zhang

    (MOE Key Laboratory of Deep Earth Science and Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China)

  • Zhiguo Cao

    (State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, China Energy Investment Co. LTD, Beijing 100011, China
    National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, China)

  • Mingzhong Gao

    (MOE Key Laboratory of Deep Earth Science and Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China)

  • Yong Zhang

    (State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, China Energy Investment Co. LTD, Beijing 100011, China)

  • Jing Xie

    (MOE Key Laboratory of Deep Earth Science and Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China)

Abstract

The gas permeability and mechanical properties of coal, which are seriously influenced by mining-induced stress evolution and gas pressure conditions, are key issues in coal mining and enhanced coalbed methane recovery. To obtain a comprehensive understanding of the effects of mining-induced stress conditions and gas pressures on the mechanical behavior and permeability evolution of coal, a series of mining-induced stress unloading experiments at different gas pressures were conducted. The test results are compared with the results of conventional triaxial compression tests also conducted at different gas pressures, and the different mechanisms between these two methods were theoretically analyzed. The test results show that under the same mining-induced stress conditions, the strength of the coal mass decreases with increasing gas pressure, while the absolute deformation of the coal mass increases. Under real mining-induced stress conditions, the volumetric strain of the coal mass remains negative, which means that the volume of the coal mass continues to increase. The volumetric strain corresponding to the peak stress of the coal mass increases with gas pressure in the same mining layout simulation. However, in conventional triaxial compression tests, the coal mass volume continues to decrease and in a compressional state, and there is no obvious deformation stage that occurs during the mining-induced stress unloading tests. The theoretical and experimental analyses show that mining-induced stress unloading and gas pressure changes greatly impact the deformation, failure mechanism and permeability enhancement of coal.

Suggested Citation

  • Zetian Zhang & Ru Zhang & Zhiguo Cao & Mingzhong Gao & Yong Zhang & Jing Xie, 2020. "Mechanical Behavior and Permeability Evolution of Coal under Different Mining-Induced Stress Conditions and Gas Pressures," Energies, MDPI, vol. 13(11), pages 1-26, May.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:11:p:2677-:d:363034
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    References listed on IDEAS

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    2. Yun Ji & Yating Hao & Ning Yi & Tianyuan Guan & Dianrong Gao & Yingna Liang, 2022. "Comparison of Axial Flow and Swirling Flow on Particle Pickup in Horizontal Pneumatic Conveying," Energies, MDPI, vol. 15(17), pages 1-18, August.

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