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Stress Distribution on Blasting Gallery Barrier Pillar due to Goaf Formation During Extraction

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Abstract

Semi-mechanised blasting gallery mining is a sustainable option to achieve higher production and productivity from underground thick coal seams. Judicious design of underground blasting gallery panel requires understanding of stress distribution on barrier pillars during different stages of extraction. This paper presents a study of stress distribution in and around barrier pillar for the different stages of extraction in the blasting gallery panel. Finite difference analysis taken up for final excavation (depillaring) in the panel with different stages of extraction. Analysis revealed that the stress transferred on barrier pillar increased as progress of excavation increased. Maximum stress was observed at a distance of 10 and 12 m from the pillar edge for virgin and goaved out panel sideby respectively, which gradually decreased towards centre of the pillar.

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Acknowledgments

Author is thankful to SCCL for carrying out the project and sincere thanks are due to Director, NIRM, for permission to submit the paper in journal.

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Authors and Affiliations

  1. National Institute of Rock Mechanics, Kolar Gold Fields, 563 117, India

    Sandi Kumar Reddy

  2. Department of Mining Engineering, National Institute of Technology Karnataka, Surathkal, 575 025, India

    Vedala Rama Sastry

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  1. Sandi Kumar Reddy
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  2. Vedala Rama Sastry
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Correspondence to Sandi Kumar Reddy.

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Kumar Reddy, S., Sastry, V.R. Stress Distribution on Blasting Gallery Barrier Pillar due to Goaf Formation During Extraction. J. Inst. Eng. India Ser. D 97, 205–213 (2016). https://doi.org/10.1007/s40033-015-0090-8

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  • DOI: https://doi.org/10.1007/s40033-015-0090-8

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