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Mining-Induced Coal Permeability Change Under Different Mining Layouts

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Abstract

To comprehensively understand the mining-induced coal permeability change, a series of laboratory unloading experiments are conducted based on a simplifying assumption of the actual mining-induced stress evolution processes of three typical longwall mining layouts in China, i.e., non-pillar mining (NM), top-coal caving mining (TCM) and protective coal-seam mining (PCM). A theoretical expression of the mining-induced permeability change ratio (MPCR) is derived and validated by laboratory experiments and in situ observations. The mining-induced coal permeability variation under the three typical mining layouts is quantitatively analyzed using the MPCR based on the test results. The experimental results show that the mining-induced stress evolution processes of different mining layouts do have an influence on the mechanical behavior and evolution of MPCR of coal. The coal mass in the PCM simulation has the lowest stress concentration but the highest peak MPCR (approximately 4000 %), whereas the opposite trends are observed for the coal mass under NM. The results of the coal mass under TCM fall between those for PCM and NM. The evolution of the MPCR of coal under different layouts can be divided into three sections, i.e., stable increasing section, accelerated increasing section and reducing section, but the evolution processes are slightly different for the different mining layouts. A coal bed gas intensive extraction region is recommended based on the MPCR distribution of coal seams obtained by simplifying assumptions and the laboratory testing results. The presented results are also compared with existing conventional triaxial compression test results to fully comprehend the effect of actual mining-induced stress evolution on coal property tests.

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Abbreviations

CBM:

Coal bed methane

CTC:

Conventional triaxial compression

MPCR:

Mining-induced permeability change ratio

NM:

Non-pillar mining

PCM:

Protective coal-seam mining

TCM:

Top-coal caving mining

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Acknowledgments

This research was funded by the State Key Basic Research Program of China (No. 2011CB201201) and the National Natural Science Foundation of China (No. 51204113, 51134018 and 51104101).

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Authors and Affiliations

  1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, China

    Zetian Zhang, Ru Zhang, Heping Xie, Mingzhong Gao & Jing Xie

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  1. Zetian Zhang
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  2. Ru Zhang
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Correspondence to Ru Zhang.

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Zhang, Z., Zhang, R., Xie, H. et al. Mining-Induced Coal Permeability Change Under Different Mining Layouts. Rock Mech Rock Eng 49, 3753–3768 (2016). https://doi.org/10.1007/s00603-016-0979-z

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