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Numerical investigation into effect of rear barrier pillar on stress distribution around a longwall face

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Abstract

Numerical investigation was performed to examine the effect of rear barrier pillar on stress distribution around a longwall face. Salamon theoretical formula was used to calculate the parameters of the caving zone, which was later assigned to double yield constitutive model in FLAC3D. Numerical results demonstrate that high stress concentration zone exists above the region where the second open-off cut intersects with the rear barrier pillar due to stress transfer and plastic zone expansion. It is also found that the maximum vertical stresses with varied distance to the seam floor are all within the projective plane of the rear barrier pillar and their positions concentrate on the barrier pillar adjacent to the connection corner of the second open-off cut. In addition, position of the maximum vertical stresses abruptly transfer from the connection corner adjacent to former panel to that adjacent to current panel along the panel direction.

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Authors and Affiliations

  1. School of Mines, China University of Mining and Technology, Xuzhou, 221008, China

    Ming-he Ju  (鞠明和), Xue-hua Li  (李学华), Qiang-ling Yao  (姚强岭), Dong-wei Li  (李冬伟), Zhao-hui Chong  (种照辉) & Jian Zhou  (周健)

  2. Key Laboratory of Deep Coal Resource Mining of Ministry of Education (CUMT), Xuzhou, 221008, China

    Ming-he Ju  (鞠明和), Xue-hua Li  (李学华), Qiang-ling Yao  (姚强岭), Dong-wei Li  (李冬伟), Zhao-hui Chong  (种照辉) & Jian Zhou  (周健)

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  1. Ming-he Ju  (鞠明和)
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  2. Xue-hua Li  (李学华)
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  3. Qiang-ling Yao  (姚强岭)
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  4. Dong-wei Li  (李冬伟)
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  5. Zhao-hui Chong  (种照辉)
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  6. Jian Zhou  (周健)
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Corresponding author

Correspondence to Xue-hua Li  (李学华).

Additional information

Foundation item: Projects(51474208, 51304208) supported by the National Natural Science Foundation of China; Project supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), China; Project(SKLCRSM12X01) supported by the State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology

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Ju, Mh., Li, Xh., Yao, Ql. et al. Numerical investigation into effect of rear barrier pillar on stress distribution around a longwall face. J. Cent. South Univ. 22, 4372–4384 (2015). https://doi.org/10.1007/s11771-015-2986-8

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  • DOI: https://doi.org/10.1007/s11771-015-2986-8

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