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Numerical Analysis of Longwall Gate-Entry Stability under Weak Geological Condition: A Case Study of an Indonesian Coal Mine

Author

Listed:
  • Takashi Sasaoka

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

  • Pisith Mao

    (Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
    Department of Geo-Resources and Geotechnical Engineering, Institute of Technology of Cambodia, Phnom Penh 12150, Cambodia)

  • Hideki Shimada

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

  • Akihiro Hamanaka

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

  • Jiro Oya

    (MM Nagata Coal Tech Co., Ltd., Tokyo 140-0002, Japan)

Abstract

The present research primarily focuses on the investigation of gate-entry stability of longwall trial panel under weak geological condition in Indonesia coal mine by means of numerical analysis. This work aims at identifying appropriate roof support at 100 m and 150 m of depth during gate development. Due to depth depending competency of dominant rock, the stability of gate-entry at 100 m of depth can be optimized by leaving at least 1 m of remaining coal thickness (RCT) above and below the gate-entry. The appropriate support for the trial panel gate-entry is steel arch SS540 with 1 m and 0.5 m spacing for 100 m and 150 m of depth, respectively. The influence of panel excavation on gate-entry is also discussed. Regarding the aforementioned influence, the utilization of additional gate mobile support is recommended at least 10 m from the longwall face.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:18:p:4710-:d:411412
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    References listed on IDEAS

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    1. Ximin Cui & Yuling Zhao & Guorui Wang & Bing Zhang & Chunyi Li, 2020. "Calculation of Residual Surface Subsidence Above Abandoned Longwall Coal Mining," Sustainability, MDPI, vol. 12(4), pages 1-12, February.
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    Cited by:

    1. Sylwester Rajwa & Tomasz Janoszek & Janina Świątek & Andrzej Walentek & Dominik Bałaga, 2022. "Numerical Simulation of the Impact of Unmined Longwall Panel on the Working Stability of a Longwall Using UDEC 2D—A Case Study," Energies, MDPI, vol. 15(5), pages 1-19, February.
    2. Sari Melati & Ridho Kresna Wattimena & David Prambudi Sahara & Syafrizal & Ganda Marihot Simangunsong & Wahyu Hidayat & Erwin Riyanto & Raden Roro Shinta Felisia, 2022. "Block Caving Mining Method: Transformation and Its Potency in Indonesia," Energies, MDPI, vol. 16(1), pages 1-36, December.
    3. 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.

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