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Numerical Modeling for Yield Pillar Design: A Case Study

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Abstract

Two single-entry gateroad systems employing a yield pillar for bump control in a Chinese coal mine were introduced. The overburden depth of the longwall panels was approximately 390 m. When the width/height (W/H) ratio of the yield pillar was 2.67, coal bumps in the tailgate occurred in front of the longwall retreating face. However, in another panel, the coal bump was eliminated because the W/H ratio was reduced to 1.67. Under this condition, instrumentation results indicated that the roof-to-floor and rib-to-rib convergences reached 1,050 and 790 mm, respectively, during longwall retreat. The numerical model was used to back-analyze the two cases of yield pillar application in the hope to find the principle for yield pillar design. In order to improve the reliability of the numerical model, the strain-hardening gob and strain-softening pillar materials were meticulously calibrated, and the coal/rock interface strength was determined by laboratory direct shear tests. The results of the validated model indicate that if the W/H ratio of the yield pillar equals 1.67, the peak vertical stress in the panel rib (37.7 MPa) is much larger than that in the yield pillar (21.1 MPa); however, the peak vertical stress in the panel rib (30.87 MPa) is smaller than that in the yield pillar (36 MPa) when the W/H ratio of yield pillar is 2.67. These findings may be helpful to the design of yield pillars for bump control.

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Acknowledgments

This research was sponsored by the National Natural Science Foundation of China through Contract No. 51174195. Also, the authors would like to express their sincere appreciation and gratitude to Dr. Khaled Morsy (The National Institute for Occupational Safety and Health, or NIOSH, Pittsburg, PA, USA) and Dr. Keith Heasley (West Virginia University) for their help on numerical modeling.

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Authors and Affiliations

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

    Wenfeng Li, Jianbiao Bai, Xiangyu Wang & Ying Xu

  2. College of Engineering and Mineral Resources, West Virginia University, Morgantown, WV, USA

    Wenfeng Li & Syd Peng

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  1. Wenfeng Li
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  2. Jianbiao Bai
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  3. Syd Peng
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  4. Xiangyu Wang
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Correspondence to Jianbiao Bai.

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Li, W., Bai, J., Peng, S. et al. Numerical Modeling for Yield Pillar Design: A Case Study. Rock Mech Rock Eng 48, 305–318 (2015). https://doi.org/10.1007/s00603-013-0539-8

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