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Numerical Simulation on Pillar Design for Longwall Mining under Weak Immediate Roof and Floor Strata in Indonesia

Author

Listed:
  • Hiroto Hashikawa

    (Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan)

  • Pisith Mao

    (Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education of China, School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    Materials Science and Structure Unit, Research and Innovation Center, Institute of Technology of Cambodia, Phnom Penh 12150, Cambodia)

  • Takashi Sasaoka

    (Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan)

  • Akihiro Hamanaka

    (Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan)

  • Hideki Shimada

    (Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan)

  • Ulaankhuu Batsaikhan

    (Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan)

  • Jiro Oya

    (Mitsui Matsushima Holdings Co., Ltd., Fukuoka 810-8527, Japan)

Abstract

In Indonesia, the adoption of the underground coal mining method is discussed to extend coal production. However, the geological conditions in Indonesia are very weak. In particular, the mechanical properties of the immediate roof/floor in shallow depths are weaker than those of coal. Therefore, the control measures to maintain stability around the developing area should be discussed for safe longwall mining operations. This study discusses the design of safety pillar width in longwall mining under weak geological conditions by using FLAC3D. The study reveals that the conventional equations for the determination of the pillar width, i.e., Obert-Duvall, Holland-Gaddy, and Bieniawski equations, can be adopted to maintain the stability of the pillar itself but are not suitable for the stability of the longwall face because of the influence of the extracted neighboring panels. Additionally, the increase of the pillar width can significantly reduce the fracture zone around the longwall face. Also, increasing the setting load of the powered support can slightly improve the stability. In the pillar design, both the pillar strength and the stability of the longwall face under weak geological conditions need to be considered.

Suggested Citation

  • Hiroto Hashikawa & Pisith Mao & Takashi Sasaoka & Akihiro Hamanaka & Hideki Shimada & Ulaankhuu Batsaikhan & Jiro Oya, 2022. "Numerical Simulation on Pillar Design for Longwall Mining under Weak Immediate Roof and Floor Strata in Indonesia," Sustainability, MDPI, vol. 14(24), pages 1-13, December.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:24:p:16508-:d:998665
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    References listed on IDEAS

    as
    1. Pisith Mao & Hiroto Hashikawa & Takashi Sasaoka & Hideki Shimada & Zhijun Wan & Akihiro Hamanaka & Jiro Oya, 2022. "Numerical Investigation of Roof Stability in Longwall Face Developed in Shallow Depth under Weak Geological Conditions," Sustainability, MDPI, vol. 14(3), pages 1-23, January.
    2. Takashi Sasaoka & Pisith Mao & Hideki Shimada & Akihiro Hamanaka & Jiro Oya, 2020. "Numerical Analysis of Longwall Gate-Entry Stability under Weak Geological Condition: A Case Study of an Indonesian Coal Mine," Energies, MDPI, vol. 13(18), pages 1-15, September.
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    Cited by:

    1. Yuxi Hao & Mingliang Li & Wen Wang & Zhizeng Zhang & Zhun Li, 2023. "Study on the Stress Distribution and Stability Control of Surrounding Rock of Reserved Roadway with Hard Roof," Sustainability, MDPI, vol. 15(19), pages 1-21, September.

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