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An Experimental Study on Preparation of Reconstituted Tectonic Coal Samples: Optimization of Preparation Conditions

Author

Listed:
  • Jishi Geng

    (School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
    The first two authors contributed equally to this work.)

  • Liwen Cao

    (School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
    The first two authors contributed equally to this work.)

  • Congyu Zhong

    (School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China)

  • Shuai Zhang

    (School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

The uniquely soft and fragile nature of tectonic coal makes it difficult to obtain core samples suitable for laboratory experimentation. Preparation of reconstituted tectonic coal (RTC) samples generally adopts the secondary forming method. Reliable coal samples are needed to obtain credible permeability and mechanical parameters that can guide Coalbed Methane (CBM) extraction and improve mining safety. In this study, the compaction mechanism of coal particles is analyzed based on the Kawakita model, and optimal sample preparation conditions are systemically investigated, particularly particle size and particle size distribution, forming pressure, and moisture content. The density and P-wave velocity of coal samples were used to test whether the RTC samples were realistic. Finally, the mechanical properties and deformation characteristics of the RTC samples were determined. The results indicate that RTC samples prepared for laboratory testing of mechanical properties require (1) the original particle size of the tectonic coal to be retained as much as possible; (2) a forming pressure that compacts the sample similar to the original tectonic coal; and (3) an optimum moisture content.

Suggested Citation

  • Jishi Geng & Liwen Cao & Congyu Zhong & Shuai Zhang, 2021. "An Experimental Study on Preparation of Reconstituted Tectonic Coal Samples: Optimization of Preparation Conditions," Energies, MDPI, vol. 14(10), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:10:p:2846-:d:555050
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    Cited by:

    1. Deyi Gao & Shuxun Sang & Shiqi Liu & Wenkai Wang & Hang Mo, 2023. "Experimental Investigation on the Deformation Characteristics and Mechanical Behaviors of Tectonic Coal under Complex Unloading Confining Pressure," Energies, MDPI, vol. 16(4), pages 1-18, February.

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