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Effects of Water and Brine Saturation on Mechanical Property Alterations of Brown Coal

Author

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  • Xiaogang Zhang

    (Deep Earth Energy Research Laboratory, Building 60, Monash University, Melbourne, VIC 3800, Australia)

  • Ranjith Pathegama Gamage

    (Deep Earth Energy Research Laboratory, Building 60, Monash University, Melbourne, VIC 3800, Australia)

  • Mandadige Samintha Anne Perera

    (Deep Earth Energy Research Laboratory, Building 60, Monash University, Melbourne, VIC 3800, Australia
    Department of Infrastructure Engineering, Building 176, The University of Melbourne, Melbourne, VIC 3010, Australia)

  • Ashani Savinda Ranathunga

    (Department of Civil Engineering, University of Moratuwa, Moratuwa 10400, Sri Lanka)

Abstract

The adsorption of moisture or brine into coal causes the coal mass mechanical properties to be significantly altered, which can greatly affect the coal mining and coal seam gas extraction process. A study was therefore initiated to investigate the influence of moisture and brine saturations (5–25%) on brown coals’ strength through a series of unconfined compressive strength tests, with the aid of acoustic emission, optical 3-D deformation analysis and scanning electron microscopy. According to the results, the coal mass is weakened by up to 26% upon the adsorption of moisture and water saturated samples show no crack propagation, whereas brine saturation enhances coal strength by up to 21% and delays crack propagation due to the crystallization of sodium chloride. Besides, a high brine concentration (25%) greatly improves coal mass strength but impairs the increase of Young’s modulus due to its corrosive nature, which is consistent with the values of maximum strain at failure of the tested samples (3.9%, 3.1% and 3.6% for 5%, 15% and 25% brine saturated samples, respectively). In addition, because of the precipitation of sodium chloride in coal and the increase of conductivity of pore fluid, more acoustic emission signals are detected for brine saturated samples, while water saturated samples exhibit mush less acoustic release compared to the unsaturated samples.

Suggested Citation

  • Xiaogang Zhang & Ranjith Pathegama Gamage & Mandadige Samintha Anne Perera & Ashani Savinda Ranathunga, 2018. "Effects of Water and Brine Saturation on Mechanical Property Alterations of Brown Coal," Energies, MDPI, vol. 11(5), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:5:p:1116-:d:144168
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    References listed on IDEAS

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    6. Perera, M.S.A. & Ranjith, P.G. & Peter, M., 2011. "Effects of saturation medium and pressure on strength parameters of Latrobe Valley brown coal: Carbon dioxide, water and nitrogen saturations," Energy, Elsevier, vol. 36(12), pages 6941-6947.
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    Cited by:

    1. Huping Wang & Zhao Wang & Haikui Yin & Chao Jin & Xiaogang Zhang & Langtao Liu, 2023. "CO 2 Flow Characteristics in Macro-Scale Coal Sample: Effect of CO 2 Injection Pressure and Buried Depth," Sustainability, MDPI, vol. 15(10), pages 1-20, May.
    2. Isaka, B.L. Avanthi & Ranjith, P.G. & Rathnaweera, T.D. & Perera, M.S.A. & Kumari, W.G.P., 2019. "Influence of long-term operation of supercritical carbon dioxide based enhanced geothermal system on mineralogical and microstructurally-induced mechanical alteration of surrounding rock mass," Renewable Energy, Elsevier, vol. 136(C), pages 428-441.

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