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Numerical Investigation of Roof Stability in Longwall Face Developed in Shallow Depth under Weak Geological Conditions

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  • 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
    Laboratory of Rock Engineering and Mining Machinery, Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan
    Materials Science and Structure Unit, Research and Innovation Center, Institute of Technology of Cambodia, Phnom Penh 12150, Cambodia)

  • Hiroto Hashikawa

    (Laboratory of Rock Engineering and Mining Machinery, Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan)

  • Takashi Sasaoka

    (Laboratory of Rock Engineering and Mining Machinery, Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan)

  • Hideki Shimada

    (Laboratory of Rock Engineering and Mining Machinery, Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan)

  • Zhijun Wan

    (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)

  • Akihiro Hamanaka

    (Laboratory of Rock Engineering and Mining Machinery, Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan)

  • Jiro Oya

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

Abstract

Developing longwall mining under weak geological conditions imposes a substantial challenge with regard to the higher risk of falling roofs. Maintaining the stability of the longwall face in this aforementioned condition is crucial for smooth operation. Investigating roof conditions in longwall requires detailed study of rock behavior in response to a few key influences. This paper presents the outcome of a numerical analysis of roof stability in shallow depth longwall face under weak geological conditions. A series of validated FLAC3D models was developed to examine the roof condition of the longwall face under the influence of shield canopy ratio, shield resistance force, and stress ratio. The results show that these three key factors have a significant impact on longwall roof conditions, which can be used to optimize its stability. Two distinct mechanisms of the roof caving behavior can be observed under the influence of stress ratio. The countermeasures of reducing face-to-tip distance and cutting width are proposed to improve the roof condition of longwall face under weak rock. The outcomes show a substantial improvement in roof conditions after adopting the proposed method.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:3:p:1036-:d:726980
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    References listed on IDEAS

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    1. Azadeh, A. & Tarverdian, S., 2007. "Integration of genetic algorithm, computer simulation and design of experiments for forecasting electrical energy consumption," Energy Policy, Elsevier, vol. 35(10), pages 5229-5241, October.
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    Cited by:

    1. 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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